Answer:
B. structure. is the correct answer.
Explanation:
Rosalind Franklin's x-ray diffraction images of DNA gave James Watson and Francis Crick information about DNA's structure.Rosalind Franklin utilized a method called X-ray crystallography to determine out the 3D form of molecules and made important contributions in understanding the accurate DNA structure. James Watson and Francis Crick used Franklin's data in creating a three-dimensional form of DNA. They proved that DNA is a double helix structure and the two strands of DNA are wind around each other like a twisting ladder.The oceans were formed during the original accretion of the Earth
True or False
The answer is false! :) Just took the test. ;D
Which of the following statements is true?
A) The ocean contains very little NaCl.
B) Dissolved minerals from rocks are deposited in the ocean.
C) Density is a comparison between volume and salinity.
D) One atmosphere is equal to 20 pounds per square inch (psi).
Answer: Option (B) is the correct answer.
Explanation:
It is known that salt water contains high amount of sodium chloride (NaCl).
Also, when it rains then minerals from the rocks are washed or carried away by rain water. Therefore, this rain water passes through various routes and finally reaches to the ocean.
Therefore, the minerals from rocks are deposited in the ocean.
On the other hand, density is defined as mass divided by volume.
Mathematically, Density = [tex]\frac{mass}{volume}[/tex]
Also, it is known that 1 atmosphere equals 14.69 pound per square inche and not equals to 20 pounds per square inch.
Thus, we can conclude that the true statement is dissolved minerals from rocks are deposited in the ocean.
If a reaction in one direction releases energywhat is the reaction in the opposite direction
Answer:
absorbs energy
Explanation:
What type of blood vessel returns blood to the heart?
Veins are the type of blood vessel that returns blood to the heart.
Explanation:The type of blood vessel that returns blood to the heart is veins. Veins are thin-walled vessels that carry blood back to the heart. They have valves that promote the one-way flow of blood toward the heart and prevent backflow.
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The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?
A) 18
B) 36
C) 48
D) 72
Answer:
C)48
Explanation:
pluto is never wrong
The double membrane around the nucleus is called the
Explain a chromosome deletion and the effect it can have on a human.
The choices are:
Part of a chromosome breaks off and does not reattach.
It results in the loss of one or more genes.
DiGeorge syndrome occurs when part of chromosome 22 is deleted.
DiGeorge syndrome causes cleft palate, immune deficiency, developmental issues, and learning difficulties.
100% right.
Hope it helps!
Nucleic acids are biological polymers that are comprised of nucleotide monomers covalently bonded together.
Nucleic acids, encompassing both DNA and RNA, are biomolecules critical for genetic information storage, protein synthesis, and heredity. They are composed of chains of nucleotides with a sugar-phosphate backbone and sequence-specific nitrogenous bases.
Explanation:Nucleic Acids Definition and RoleNucleic acids are essential biopolymers that are critical for storing and expressing genetic information in living organisms. These molecules include two main types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Each nucleic acid strand is composed of monomers called nucleotides, which contain a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleotides connect via phosphate diester linkages, resulting in polynucleotide chains with directionality, indicated by a free 5' phosphate group and a free 3' hydroxyl group.
Specifically, DNA contains two polynucleotide chains forming a double helix, held together by bonds between complementary bases. It is the molecule that holds the genetic blueprint for protein synthesis and inheritance of traits. RNA, on the other hand, usually consists of a single polynucleotide chain and plays a role in protein synthesis as well as in various regulatory and catalytic activities within the cell.
By binding together, nucleotides form the backbone of nucleic acids, which in the case of DNA, creates its characteristic double helix shape. The sequence of nucleotides within nucleic acids encodes the genetic instructions vital for cellular functions such as cell division, protein synthesis, and the transmission of genetic information from one generation to the next.
Botulinum toxin binds to receptors present at the axon terminal in order to enter the neuron
true or false
The Botulinum toxin is a neurotoxins produced by the Clostridium botulinum. This toxin bind to the neuron presynaptically and by the exocytosis it enters in the neuron. It has a greater affinity to Cholinergic receptors as compared to the acetylcholine. Hence, the toxin causes the decrease in the release of the acetylcholine molecules.
As a result of the decreased in the release of the acetylcholine the neuro-transmission is blocked, and due to this the person dies.
Hence, the given statement is true.
How can disruptions in the cell cycle lead to cancer?
Select the best description for each cycle:
1.Hydrologic A. photosynthesis and respiration
2.Rock B. erosion, deposition, metamorphism
3.Tectonic C. housed mostly in rock material
4.Carbon D. it's all about water
5.Nitrogen E. subduction, uplift, and mantle convection
6.Phosphorus F. it's all about special bacteria
The right matches are:
1.Hydrologic is matched with D. it's all about water
Hydrology is the science of the earth which is interested in the terrestrial branch of the water cycle, that is to say in the exchanges between the atmosphere, the terrestrial surface and its subsoil. We speak of hydrosphere to designate the part of the planet in which water is located.
2.Rock is matched with B. erosion, deposition, metamorphism
Rocks are natural materials generally solid and formed, essentially or entirely, by an assemblage of minerals, sometimes including fossils (especially in sedimentary rocks), glass resulting from the rapid cooling of a liquid (volcanism, friction .. .) or aggregates of other rocks. The rocks can be formed of a single mineral species (monomeral rocks) or of several (polymineral rocks):
3.Tectonic is matched with E. subduction, uplift, and mantle convection
Tectonics is the study of geological structures of kilometric scale and more, such as mountain ranges or sedimentary basins, and mechanisms that are responsible. This discipline is directly related to plate tectonics.
The lithosphere, the rigid outer shell of the Earth consisting of the crust and part of the upper mantle, is subdivided into plates, called tectonic or lithospheric plates.
4.Carbon is matched with A. photosynthesis and respiration
The 2 main carbon "reservoirs" most directly involved in this cycle are the atmospheric CO2 and the carbon constitutfs of living beings. During photosynthesis, CO2 and water combine (reduction reaction) under the effect of light energy (sun) to form carbohydrates.
Then, in all organisms, these carbohydrates are oxidized to reform water and CO2 during breathing. Part of the energy contained in carbohydrates is converted into ATP. Up to 35% of the CO2 fixed during photosynthesis is released during leaf respiration.
5.Nitrogen is matched with F. it's all about special bacteria
Special bacteria pick up nitrogen and release it in a form that can be assimilated by the plant
To be absorbed by the plant, the nitrogen present in the atmosphere in N2 form must undergo biological transformation processes carried out by microorganisms called nitrogen-fixing bacteria. These nitrogen-fixing bacteria have the main function of capturing the nitrogen present in the air, but also in the soil (thus limiting the losses in the aquifers), and to return it to the plant in an available and assimilable form. Nitrogen in soil is in NO3- form (soil nitrate) and nitrogen in air is in N2 form (atmospheric nitrogen).
6.Phosphorus is matched with C. housed mostly in rock material
Global phosphate mineral resources are estimated at more than 300 billion tonnes in 2014 (US Geological Survey). The largest sedimentary deposits are found in North Africa (Morocco), China, the Middle East and the United States. The exploited phosphorus deposits come mainly from sedimentary or marine deposits, but also magmatic deposits or guano from exotic marine birds.
Q; A nucleotide consists of ?
A: A sugar, a protein and uracil
B: A phosphate, a sugar and a nitrogen base
C: A phosphate, an amino acid and a nitrogen base
D: A sugar and a nitrogen base
Answer:
Option B, A phosphate, a sugar and a nitrogen base
Explanation:
Nucleotide is a basic building unit of DNA. Each nucleotide comprises of three major constituents – a) A sugar, b) A phosphate and c) a nitrogenous base.
While forming a DNA molecule, deoxyribose acts as a specific sugar. When the nucleotides are linked together, they are supported by the phosphate bond and sugar as backbone. The two strands of DNA attaches to each other through the nitrogenous bases in a way that nitrogenous base of one nucleotide attached to the nitrogenous base of other nucleotide through hydrogen bonds.
Hence, option B is correct
Membrane proteins are among the most important proteins biologically because they allow the cells to communicate with their environments. These membrane proteins are responsible for ALL BUT which process?
A) triggering ion channels
B) identifying foreign cells
C) regulating intake of oxygen
D) activating growth hormone reactions
Membrane proteins are the proteins responsible for the interaction with the biological membrane. It is associated with triggering ion channels, identifying foreign cells, and activating growth hormone reactions.
What are the functions of membrane proteins?Membrane proteins have a large number of functions, including the following:
It helps cells to communicate with each other.Maintain the shape of cells.Work according to the changes done by chemical messengers.Transport and share the material through the cell membrane.Activate several reactions.It is not involved in regulating the intake of oxygen.
Thus, the correct option is C.
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One student group's data for amount of yeast can be seen here. Describe the students' results. A) The optimum amount of yeast for maximum fermentation is 2 grams. B) There is no correlation between amount of yeast and the rate of fermentation. C) There is a inverse relationship between the rate of fermentation and amount of yeast. D) There is a direct relationship between the amount of yeast and the rate of fermentation.
Answer:
There is a direct relationship between the amount of yeast and the rate of fermentation.
Explanation:
Answer:
Option D, There is a direct relationship between the amount of yeast and the rate of fermentation.
Explanation:
The rate of fermentation increases till the time an optimum stage is not reached . Once the optimum stage is reached , any further increase in yeast concentration do not affect fermentation rate. Thus, it can be said that before reaching optimal value of yeast concentration, the rate of fermentation is directly proportional to the yeast concentration.
Hence, option D is correct.
Which statement correctly describes the difference between meiosis I and
meiosis II?
A) Meiosis I brings together sister chromatids, and meiosis II separates them.
B) Meiosis I separates tetrads, and meiosis II separates sister chromatids.
C) Meiosis I separates sister chromatids, and meiosis II separates tetrads.
B) Meiosis I separates tetrads, and meiosis II separates sister chromatids.
What encodes genetic information?
Which vegetable is in chicken divan: asparagus or corn or broccoli?
When new cells are formed through the process of mitosis, the number of chromosomes in the new cells
A)is half of that of the parent cell.
B)decreases every time the cell divides.
C)increases every time the cell divides.
D)remains the same as in the parent cell.
When new cells are formed through the process of mitosis, the number of chromosomes in the new cells remains the same as in the parent cell.
What is chromosome ?A chromosome is defined as a thread-like structure present in the nucleus of cells such as both prokaryotic and eukaryotic cell and it is made of a molecule of DNA (Deoxyribonucleic acid) and histone proteins.
It is composed of three components, DNA, proteins and RNA, amount of the DNA content ranges from 30 to 40 %, the amount of proteins from 50 to 65%, and small amount of RNA from 1 to 10%.
Two types of protein present in DNA such as histone and non-histones proteins, histone constitute large amount (90% of total protein), whereas non-histone is present in small amount (around 10% of total protein).
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What are four examples of cells that go through mitosis?
Mitosis is the process of cell division that produces two identical daughter cells and involves skin, epithelial, and blood cells, as well as cells involved in regeneration, such as those in starfish. It consists of four phases: prophase, metaphase, anaphase, and telophase followed by cytokinesis.
Four examples of cells that go through mitosis include:
Skin cells - Constantly regenerated to replace dead or damaged skin.Epithelial cells - These line the surfaces inside and outside of the body (like the gut) and are frequently renewed.Blood cells - Specifically red blood cells are replaced every four months, maintaining the necessary count in the bloodstream.Regeneration cells in organisms - For instance, starfish regenerate lost arms through the process of mitosis.Mitosis is a process that consists of four phases:
Prophase - Chromosomes condense and the nuclear envelope breaks down.Metaphase - Chromosomes line up along the metaphase plate in the center of the cell.Anaphase - Sister chromatids separate and move to opposite poles of the cell.Telophase and Cytokinesis - Chromosomes decondense, nuclear envelopes form around each set of chromosomes, and the cell divides its cytoplasm to form two daughter cells.The division of eukaryotic cells (cells with a nucleus and more than one chromosome) includes both mitosis and cytokinesis, resulting in the formation of two genetically identical daughter cells.
A biologist is in the process of classifying a newly discovered fungus. The fungus is a decomposer and has saclike structures. To which group does the organism most likely belong?
fungi that are rusts
fungi that are associated with bread mold
fungi that makes blue cheese
fungi that are autotrophic decomposers
Answer:
B: Fungi that are associated with bread mold
Explanation:
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Which of the following is a likely reason for the decrease in stability for societies that rely on external control?
A. Societies that rely on external control are less likely to maintain sustainable practices, due to their larger size.
B. Societies that rely on external control are more likely to be self-regulating.
C. Societies that rely on external control are less likely to have low unemployment rates.
D. Societies that rely on external control are more likely to be independent of water and biomass resources.
Answer: A. Societies that rely on external control are less likely to maintain sustainable practices, due to their larger size.
Societies that rely on external control are less likely to maintain sustainable practices, due to their larger size is the likely reason for the decrease in the stability for the society that rely on the external control because the maintenance and control of the natural resources should be done willingly at the individual level this indicates that how aware the society is in sustainably using the resources. The external influence imposed by the society in conservation and sustainability shows the instability.
Which statement explains why oxygen molecules easily diffuse across a cell membrane while glucose molecules do not?
A. Oxygen is polar.
B. Glucose is too big to pass through.
C. Protein membranes block glucose.
D. Oxygen is a gas.
Answer:
Glucose is too big to pass through
Explanation:
Which of these is one of the only two mammals that lay eggs?
wombat
duck-billed platypus
three-toed sloth
chicken
Answer:
Chickens and duck-billed platypus both lay eggs.
If you can answer in only one I would go with the chicken, but that's just me. ;)
Hope I helped, have a nice day!
What is the genotype ration between the cross YyRr x YyRr?
YYRR:2YYRr:2Yyrr:4YyRr:YYrr:2YyRR:yyRR:yyRr:yyrr
2YYRR:2YYRr:2Yyrr:4YyRr:YYrr:2YyRR:yyRR:yyRr:yyrr
YYRR:2YYRr:2Yyrr:4YyRr:YYrr:2YyRR:yyRR:yyRr:2yyrr
YYRR:2YYRr:2Yyrr:4YyRr:YYrr:2YyRR:yyRR:2yyRr:yyrr
Answer:
Option D
1 YYRR: 2 YYRr: 2 Yyrr: 4 YyRr : 1 YYrr : 2 YyRR : 1 yyRR : 2 yyRr: 1 yyrr
Explanation:
The genotype of the cross between dihybrid cross will be as follows
YR
Yr
yR
yr
So the punnet square for this cross will be as follows -
YR Yr yR yr
YR YYRR YYRr YyRR YrRr
Yr YYRr YYrr YyRr Yyrr
yR YyRR YyRr yyRR yyRr
yr YyRr Yyrr yyRr yyrr
The genotypic ratio is as follows -
1 YYRR: 2 YYRr: 2 Yyrr: 4 YyRr : 1 YYrr : 2 YyRR : 1 yyRR : 2 yyRr: 1 yyrr
Hence,option D is the correct answer
Honey is not a fluid since it is so thick that it has a hard time flowing. true or false
Vertebrates that are warm blooded, have feathers and reproduce by laying eggs would be classified as _______
Answer:
Class - Aves, examples birds.
Explanation:
Birds are vertebrates that are included in the class aves. Their body is covered with feathers. Have wings for flying. They are warm blooded (endothermic) animals with thin-walled and hollow bones. These bones are denser, stiffer, and stronger. They high metabolic rate to fulfil high energy requirement. They have beak made of keratin. They are oviparous or egg laying vertebrates.
How is the size of a planet related to the thickness of its atmosphere
The bigger the planet the bigger the gravitational pull of the planet , which is also stipulated in Newton Law of gravity. The bigger the planet, therefore, the bigger the atmosphere it would have. This is because its gravity is able to overcome the kinetic energy of the gas molecules (especially when heated by rays from a star they are orbiting) that would allow the gas atoms/molecules to escape into space. This is also why the large planets are all gas giants such as Jupiter.
The peripheral nervous system connects the body to the
a mushroom and a humpback whale are alike because both are
The ____________ is part of the appendicular skeleton, while the ________ is part of the axial skeleton
Answer:
Scapula and sternum.
Explanation:
The scapula is also known as shoulder bone, blade bone, shoulder blade or wing bone, is the bone which connects the upper arm bone with the collar bone. Scapulae are in pair they are connected with each other and they are mirror image of each other. Therefore it is the part of appendicular skeleton.
The sternum or breastbone is located in the chest central part and it is a long flat bone. It connects with the ribs through cartilage and it forms the front of rib cage, which help in protecting lungs, heart and blood vessels from the injuries. And it is a part of the axial skeleton.
The correct answer is: "The femur is part of the appendicular skeleton, while the vertebra is part of the axial skeleton."
The human skeleton is divided into two main parts: the axial skeleton and the appendicular skeleton. The axial skeleton includes the bones that form the axis of the body and consists of the skull, vertebral column, ribs, and sternum. The appendicular skeleton, on the other hand, is made up of the bones of the upper and lower limbs as well as the girdles that attach the limbs to the axial skeleton.
The femur, which is the thigh bone, is the longest and strongest bone in the human body and is part of the lower limb of the appendicular skeleton. It articulates with the hip bone proximally and the tibia and patella distally, providing support and mobility for walking, running, and jumping.
The vertebra, which is a single bone of the vertebral column, is part of the axial skeleton. The vertebral column, also known as the spine or backbone, is composed of a series of vertebrae stacked one upon the other, separated by intervertebral discs, and held together by ligaments. It houses and protects the spinal cord, supports the weight of the body, and provides flexibility to the torso.
Therefore, when filling in the blanks, the femur represents a bone of the appendicular skeleton, while the vertebra represents a bone of the axial skeleton.