The correct answer is: c. through a conformational change of the receptor
When a ligand binds to receptor that is located on a cell surface, signal has to be transported into the cell. Usually, intracellular domain of the receptor changes its “shape” (conformation) which may make it active as an enzyme or available for other molecules binding. For example, the receptor may turn on signaling molecule inside of the cell and activates further chain reactions. Consequently, the cell responses by changing its behavior or characteristics.
Which of the following traits or characteristics were not found to be more similar in identical twins when compared to fraternal twins in the minnesota twin study?
The traits or characteristics that was NOT found to be more similar in identical twins when compared to fraternal twins in the Minnesota twin study is a.) Tendency to divorce
What was the Twin studies ?
Twin studies are a unique class of epidemiological research intended to quantify the relative contribution of genetics vs environmental factors to a certain trait. The results of older twin studies have frequently been validated by later molecular genetic research, despite the fact that the classical twin studies are still influenced by assumptions developed in the 1920s and that the study design itself is the inherent restriction.
Therefore Tendency to divorce is one of the features or characteristics that the Minnesota twin study did not find to be more similar in identical twins compared to fraternal twins.
complete question;
Which of the following traits or characteristics was NOT found to be more similar in identical twins when compared to fraternal twins in the Minnesota twin study?
a.) Tendency to divorce
b.) Empathy
c.) Intelligence
d.) Leadership
A lack of explanation for continental drift prevented many scientists from accepting that a single super-continent called ____ once existed.
A) Glomar
B) Glossopteris
C) Pangaea
D) Wegener
Pangaea is the answer
Which statement most accurately describes what happens to proteins that lack an ER signal sequence?
They are inserted into the ER membrane but do not enter the ER lumen.
They are inserted into the plasma membrane.
They bypass the ER but enter the Golgi apparatus.
They are released into the cytosol.
The correct answer is: They are released into the cytosol.
A a sequence consisting of 5-30 hydrophobic amino acids on the N-terminus, which is called signal peptide or signal sequence is responsible for directing the transport of the synthesized protein. Proteins that contain such sequence are destined for secretion form the cell (vesicular), for the plasma membrane, the lumen or membrane of either the (ER), Golgi or endosomes. So, when the protein lack the sequence, it is released in the cytosol.
When there is competition among primates for mates:
a. females may produce more offspring.
b. males may learn to use tools.
c. males may become larger.
d. females may form an all-female residence pattern?
c. males may become larger
In an active synapse composed of a presynaptic and postsynaptic cell, which part of the presynaptic cell is the last to participate in the action potential? a) Cell body b) Axon terminals c) Axon d) Dendrites e) Axon hillock
Answer:
b) Axon terminals
Explanation:
Dendrite is the receiving part of the presynaptic neuron, while axon is the transmitting part of the neuron. So, after initiation, action potentials travel down axons to the terminals.
Action potential travels through the membrane of the presynaptic cell causing the voltage-gated channels permeable to calcium ions to open. Ca2+ flow through the presynaptic membrane and increase the Ca concentration in the cell which will activate proteins attached to vesicles that contain a neurotransmitter (e.g. acetylcholine). Vesicles fuse with the membrane of the presynaptic cell, thereby release their contents into the synaptic cleft-space between the membranes of the pre- and postsynaptic cells. Neurotransmitter ACh binds to its receptors on the postsynaptic membrane and its binding causes depolarization of the target cell (muscle cell). Depolarization occurs because sodium enters the cell as a result of neurotransmitter receptor binding.
To what part of the cell do the products of transcription travel
Cytoplasm would be the answer.
The products of transcription, which are mRNA molecules, travel from the nucleus to the cytoplasm of the cell. Here they are translated by ribosomes into proteins. The transportation of mRNA is a key aspect of the central Dogma of Life, covering the flow of genetic information within a biological system.
Explanation:The products of transcription, which are mRNA molecules, travel to the cytoplasm of the cell. In the nucleus, the DNA is transcribed into RNA. Afterwards, the newly synthesized RNA, serving as the intermediate messenger, is transported out of the nucleus and into the cytoplasm where ribosomes translate the RNA into protein. This separation of transcription occurring only within the nucleus, and translation only outside the nucleus in the cytoplasm, is particular to eukaryotic cells.
The transcription process involves the DNA double helix partially unwinding in the region of mRNA synthesis, forming a transcription bubble. It's crucial to note that the mRNA product is complementary to the DNA template strand and that in mRNA, T nucleotides are replaced with U nucleotides.
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F one species in a community dies out or moves, the community will A) be affected. B) stop working. C) not be affected. D) replace the species
In a community dies out or moves, the community will be affected.
The answer is A. be affected
Which of the following is a function of the protein called ubiquitin?
a.) It attaches to proteins that are marked for destruction in the cell.
b.) It assists in the removal of introns from a eukaryotic pre-mRNA.
c.) It initiates the formation of a transcription complex.
d.) It adds the 3' and 5' caps to eukaryotic pre-mRNA.
The correct answer is: a) It attaches to proteins that are marked for destruction in the cell.
Ubiquitin is a regulatory protein of eukaryotic cell with the various of function. The mechanism of its action involves the addition of ubiquitin to a substrate protein (ubiquitination). Ubiquitin regulatory roles are:
• marking thee proteins for degradation via the proteasome,
• alter the cellular location of proteins,
• promoting or preventing protein interactions.
The protein called ubiquitin functions to mark other proteins for destruction by attaching to them and directing them to the proteasome for degradation.
Explanation:The function of the protein called ubiquitin is to mark other proteins for degradation within the cell. When a protein is tagged with ubiquitin, it is an indication that the protein's lifespan is over, and it should be directed to the proteasome, which is responsible for breaking down and recycling proteins. The process of tagging proteins with ubiquitin and thereby controlling the longevity of these proteins is a key method for regulating gene expression in cells. This post-translational modification is vital for maintaining cellular homeostasis and function.
Answer: a.) It attaches to proteins that are marked for destruction in the cell.
In humans, free earlobes (E) are dominant to attached earlobes (e) and the presence of freckles (F) is dominant to the absence of freckles (f). If an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles, what is the probability of having a child with attached earlobes and freckles?
Individual heterozygous for both of these traits has the genotype EeFf while an individual with attached earlobes and no freckles has the genotype eeff (recessive homozygous for both traits). So:
P: EeFf x eeff
F1: (table)
A child with attached earlobes and freckles will have eeFf genotpe from these parents, and the probability is 4/16 or 1/4 (25%).
The probability of having a child with attached earlobes and freckles is 1.
Explanation:In this scenario, an individual heterozygous for both free earlobes (Ee) and the presence of freckles (Ff) is mating with an individual with attached earlobes and no freckles (ee ff).
When they mate, the possible gametes for the heterozygous individual are EF, Ef, eF, and ef. The possible gametes for the other individual are e f.
Therefore, the probability of having a child with attached earlobes and freckles is 1.
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How can inheritance be modeled? HELP ASAP!!
using a punnett square or pedigree
The citric acid is a stage of catabolism that oxidizes acetate into carbon dioxide and generates energy. There are eight enzymes involved in the citric acid cycle.
Which enzymes produce NADH as a product? Select all that apply
a. alpha-ketoglutarate dehydrogenase
b. succinate dehydrogenase
c. malate dehydrogenase
d. isocitrate dehydrogenase
The answer is B succinate dehydrogenase
Which genetic disorder causes the body to produce unusually thick mucus in the lungs and intestines? a. hemophilia b. Down syndrome c. cystic fibrosis d. sickle-cell disease Please select the best answer from the choices provided A B C D Mark this and return
Cycstic Fibrosis (C)
Hemophilia has to do with the blood
Down Syndrome is because of an extra chromosome
Sickle-Cell disease also has to do with blood.
the correct answer is c
An example of effectors' roles in homeostatic responses is observable when an example of effectors' roles in homeostatic responses is observable when an increase in body temperature results from exercise. an increase in body temperature results from fever. a decrease in body temperature results from shock. an increase in body temperature results from involuntary shivering. the rising sun causes an increase in body temperature in a stationary animal.
➷ It would be 'an increase in body temperature results from involuntary shivering.' As you may realize, when you stand in the cold, your body starts to shiver itself. This is from an effector producing a response to try increase your body temperature.
✽➶ Hope This Helps You!
➶ Good Luck (:
➶ Have A Great Day ^-^
↬ ʜᴀɴɴᴀʜ ♡
Effectors are muscles or glands that work to maintain homeostasis through negative feedback mechanisms. They respond to changes in the body's internal state, such as increases or decreases in temperature, by initiating responses to return to a normal state or 'set point'. The mechanisms of homeostasis can be seen in how the body responds to changes in temperature from exercise, fever, shivering, or shock.
Explanation:Effectors play a crucial role in homeostatic responses. These can be muscles that contract or relax, or glands that secrete. For example, when there's an increase in body temperature due to exercise, or a fever, or involuntary shivering, your body responds by initiating cooling mechanisms like sweating. Effectors respond to signals from the brain, usually triggered by sensory input detecting a change from the normal state, or set point. This is a part of a negative feedback mechanism that works to maintain homeostasis, a relatively stable internal state. If our body temperature drops too low, as in the case of shock, the mechanism works the other way, activating effectors that generate heat, such as by shivering, to bring the temperature back up to normal.
Maintaining homeostasis is crucial, as failure to do so can be detrimental and even cause death. There are also positive feedback loops in homeostasis, but these usually move the body further away from homeostasis, such as during childbirth when the levels of the hormone oxytocin increase to facilitate labor.
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Eric and janelle are both carriers of the recessive allele causing tay-sachs disease, which is lethal in early childhood. if they have a baby, what is the probability that this child would have tay-sachs disease?
25% would have tay-sachs disease, 25% normal, 50% carriers
Eric and Janelle have a 25% chance of having a child with Tay-Sachs disease, as they are both carriers of the recessive allele. The inheritance follows autosomal recessive patterns, with 50% chance for a carrier child and 25% for an unaffected child.
If Eric and Janelle, who are both carriers (heterozygotes) of the recessive allele causing Tay-Sachs disease, have a child, the probability that this child would have Tay-Sachs is based on autosomal recessive inheritance patterns. We represent a normal allele as 'T' and the Tay-Sachs mutation as 't'. Each parent has one of each allele (Tt).
When create a Punnett square to show all possible combinations of their alleles, we find:
Statistically, this results in a 25% chance that their child will be born with Tay-Sachs disease (tt), a 50% chance that their child will be a carrier (Tt), and a 25% chance of a child being unaffected and not a carrier (TT).
Which of the following is a segmented animal with an exoskeleton and jointed appendages?
A: Mollusks
B: Segmented Worms
C: Cnidarians
D: Arthropods
The correct answer is - D: Arthropods.
The arthropods (Arthropoda) are a very large phylum, having almost two million species described so far, and there might be even up to 15 times more than that. The arthropods are one of the oldest organisms that still exist. Their most recognizable characteristics are the exoskeleton, fragmented body, and jointed appendages. They only have an other shell, and do not posses internal skeleton, thus making them hard on the outside, and squishy on the inside. The body is fragmented, the number of fragments is differing from family to family, and that is in order for them to have greater mobility. Another characteristic that enables them greater mobility and flexibility are the jointed appendages. They were also the first more complex organisms that got out on the land, and dominated it for quite some time. Unfortunately for them, they do not have the ability to develop their brains on a higher level, thus they were easily outcompeted by the newly emerging groups of animals and fell into their shades.
What processes can change sedimentary rock into metamorphic rock?
A. Subduction and high pressure
B. Erosion and lithification
C. Heating and cooling
D. Uplift and erosion
A) Subduction and high pressure
A. Subduction and high pressure
Discuss human activity and the climate, what do you think the future has in store for our climate
climate is defined as the statistics of weather which remains in an area for a period of time. different elements are involved to asses the climate of any specific are which include, humidity, temperature, wind , atmospheric pressure, precipitation and other variables. but in the modern times since humans has evolved, they have created a lot of problems for themselves. the weather conditions are going harsh and the global temperature has increased by two degrees Centigrade. the ozone layer has been effected and the ultraviolet rays directly hit the Earth causing increased rate in cancer and health related problems. from agriculture prospective, the per capita yield is low as the weather patterns are changing.
similarly, the deforestation and excessive urbanization is other major concern for our future. the natural pattern has been challenged and the animals are going extinct the example of Polar bears and Rhinos are infront of us.
in a nutshell the future seems very uncertain if the activities of human beings tend to continue at the same pace. the coming generation will face a lot of problems. but, we can reverse that by planting more trees, managing the resources with care and creating awareness among the masses to love the dear Earth
What area of the brain experiences rapid growth of synapses and subsequent elimination of those synapses that are not used often during adolescence?
The correct answer is: prefrontal cortex
Synaptogenesis or formation of synapses begins about the 23rd week of gestation. The peak of synapse production is achieved at different periods. The massive overproduction of synapses that occurs in early childhood is followed by a gradual reduction of them also known as "synaptic pruning". “Synaptic pruning” happens during childhood, and during adolescence.
The brain continues to grow and develop, but the overall number of neurons and synapses are reduced by up to 50%. This is process that is experience driven: unnecessary neuronal structures are removed and replaced by more complex and efficient structures, that are more required to the demands of adulthood.
Myofibrils are made up of thick filaments called _[blank]_.
myosin
tendons
microfibers
actin
Myosin is the answer.
Hope this helps.
Myofibrils in muscle cells are made up of thick filaments called myosin, which work with thin actin filaments to facilitate muscle contraction.
Explanation:Myofibrils, which are essential components of muscle cells, are primarily composed of thick and thin filaments. These filaments function together to facilitate the process of muscle contraction. The thick filaments are composed of a protein called myosin, while the thin filaments consist of a protein known as actin. Therefore, myofibrils are made up of thick filaments called myosin. It's important to distinguish between myosin, tendons, and microfibers. Tendons are connective tissues that attach muscle to bone, while microfibers are very fine synthetic yarns.
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Which one of these mollusk groups can be classified as suspension feeders?
A) bivalves
B) gastropods
C) chitons
D) cephalopods
The answer is A) bivalves
5. Suppose that a dominant allele (P) codes for a polka-dot tail and a recessive allele (p) codes for a solid colored tail. In addition, suppose that a dominant allele (L) codes for long eyelashes and a recessive allele (l) codes for short eyelashes. If two individuals heterozygous for both traits (tail color and eyelash length) mate, what's the probability of the phenotypic combinations of the offspring?
A. 1:1 ratio (half are polka-dot tails and short eyelashes; half are solid tails and long eyelashes)
B. 1:1 ratio (half are polka-dot tails and long eyelashes; half are solid tails and short eyelashes)
C. 9:3:3:1 ratio (9 polka-dot tails and long eyelashes, 3 polka-dot tails and short eyelashes, 3 solid tails and long eyelashes, 1 solid tail and short eyelash)
D. 9:3:3:1 ratio (9 polka-dot tails and short eyelashes, 3 polka-dot tails and long eyelashes, 3 solid tails and short eyelashes, 1 solid tail and long eyelash)
Answer:
C.
Explanation:
According to your problem, you have to two traits to be crossed, tail and eyelashes:
P - polka-dot tail L - long eyelashes
p - solid colored tail l - short eyelashes
It says we cross two individuals that are HETEROzygous for both traits, this means that their genotypes have each allele for each trait. So the cross would be:
PpLl x PpLl
Attached is a Punnet for this cross and ratio count for both genotype and phenotype.
The ratio based on phenotype would be the following:
9 polka-long: 3 polka-short: 3 solid-long: 1 solid-short
Most of a cell function cannot use energy directly from the food we eat . Describe how the energy from the food can be transferred to form later your cells can use?
Energy can be stored in fat cells for later use, there is quick energy(Oranges are a good example for this) and slow energy(fatty foods take longer to break down)
Explain how the properties of water allow the survival of the aquatic organisms under the ice sheet.
Answer:
Water at 4 degrees centigrade has the highest density and lowest volume
Explanation:
When oceans freeze, only the upper layer freezes to ice because water above 4 degrees and freezing point are less dense. This means ice sheets float on cold water and also insulate the water underneath from fast heat loss. This how the water beneath remains liquid and supports aquatic life even in temperatures below freezing on adjacent land.
What roles did abiotic factors play in succession after the eruption? of MT Saint Helens
Answer:
Abiotic factors include all the non living factors that affect the living organisms for survival such as light, wind, heat, temperature etc.
In mountain Saint Helens,abiotic factors hold critical position for the colonization and survival of animals and plants.
For example: Wind was an important source of transferring seeds, spiders and insects in the blast zone of the mountain after the volcanic eruption.
Plant survivors, landscape , rocks and burrows played the role of nets that caught the seeds. This enables the establishment and survival of plant specie in eruption zone.
Therefore, abiotic factors have crucial role in succession after the eruption in MT Saint Helens.
Hope it help!
Final answer:
The eruption of Mt. St. Helens in 1980 led to a primary succession process where abiotic factors such as soil quality, water, and climate influenced the reestablishment of plant communities, starting with lichens and progressing to a diverse climax community.
Explanation:
The 1980 eruption of Mt. St. Helens resulted in a natural process known as succession, where a new community of plants and animals gradually recolonizes an area. After the volcanic event decimated the north side of the mountain, the landscape was overtaken by volcanic debris that created a new soil substrate devoid of the original ecosystem's remnants, such as seeds. This setting provided the stage for primary succession.
Abiotic factors like soil quality, water, and climate played crucial roles in the succession process at Mt. St. Helens. These non-living components of the ecosystem influenced which species were able to colonize the area first. For example, lichens began the process of rock breakdown, contributing to the creation of nutrient-rich soils. Next, mosses and grasses were able to grow, which further improved the soil, making it suitable for shrubs and eventually allowing for the growth of small trees.
Over time, a climax community is likely to develop, which exhibits a stable and diverse ecosystem. The changes brought on by the eruption led to the renewed cycle of plant succession, as new communities modified the environment, making it hospitable for successive plant communities until the eventual reestablishment of a forest.
In what year did the US and several other nations agree to reduce the quantity of CFCs used by 50%?
2017
1987
2007
1997
I think 1987 sorry if wrong have a great day
Answer:
1987
Explanation:
The depletion of the ozone layer and the antarctic ozone hole made a danger for the humans to survive on the planet. Depletion of the ozone from the continued use of CFCs can cause skin cancer and many problems which dragged international action to be implemented.
Thus, in 1987, around 56 countries agreed the Montreal Protocol which states the CFC production to cut and also reduction of its use to half.
After few years, this protocol was more strengthened to stop the worldwide production of CFCs and also other chemicals which depletes ozone layer.
Is brown algae unicellular or multicellular
Brown algae is multi cellular
center of integration and control a. controls the right side of the bodyb. controls the right side of the body c. conducts communication between brain and rest of bodyd. conducts communication between brain and rest of body e. allows communication between cerebral hemispheresf. allows communication between cerebral hemispheres coordinates body movementsg. coordinates body movements controls the left side of the bodyh. controls the left side of the body controls basic functions like breathing and circulationi. controls basic functions like breathing and circulation
Answer:
C and D both appear to be the same answer. I believe one of those if correct. (read explanation)
Explanation:
The spinal cord serves as a conduit for signals between the brain and the rest of the body. It also controls simple musculoskeletal reflexes without input from the brain. The brain is responsible for integrating most sensory information and coordinating body function, both consciously and unconsciously.
You have to choose between playing a team sport or taking music lessons because the practices overlap. This choice demonstrates that
music lessons are scarce
sports teams are scarce
time is scarce
demand is scarce
The choice demonstrates that time is scarce
Answer: Time is scare.
Explanation:
The time is scare because there is a over lap between the team sport or taking the music lessons. This shows that time is insufficient for the demand.
The time is not sufficient for two of the activities. The time is not available for the music lessons neither the time is available for the team sport.
There is a high demand of time but two things cannot take place at the same time.The demand for time is high but there is nothing one can do for the time, she has to choose from the given two options.
What kind of nutrients does the lymphatic system carry to the bloodstream?
The correct answer is: large fats and fat-soluble vitamins
Lymph vessels called lacteals are responsible for the transport of large fats from the digestive tract. Those vessels are located at the beginning of the gastrointestinal tract, predominantly in the small intestine. Fats and fat-soluble vitamins are absorbed from the digestive system and then transported to the venous circulation. The lymph in the lacteals is called chyle.
The humerus is the long bone that extends from the shoulder to the elbow. Which skeletal system does the humerus belong to?
The answer is the Appendicular skeleton.
Good luck!
-RxL
The system described above is the Appendicular system.