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The lock-and-key mechanism refers to
the complementary shapes of an enzyme and a substrate.
the attractive forces between an enzyme and a substrate.
the ability of an enzyme to lower the activation energy of a reaction.
the ability of an enzyme to “unlock” the products of a reaction
Answer:
Option (1).
Explanation:
Enzymes are the bio catalyst that increases the rate of biochemical reactions of the body. Enzymes are highly specific in nature and works at optimum temperature and pH conditions.
The enzymes work according to the lock and key mechanism. This mechanism explains that the active of enzyme should fit into the substrate in such a way as the key fits into its lock. Hence, this determines the complementary shapes of the substrate and enzyme.
Thus, the correct answer is option (1).
Explain how biodiversity is affected by natural selection
Answer:
Biodiversity is the variety of different species of organisms on Earth, or within an ecosystem. High biodiversity is important. It make sure that ecosystems are stable becuase different species depend on each other for things like shelter and fodd. Different species can also help to maintain the right physical environment for each other (e.g. the acidity of the soil.)
Explanation:
which of the following best describes earthquakes along transform plate boundaries? a. common and large. b. common but small-scale. c. rare but large. d. rare and small-scale.
Answer:c
Explanation:
Which neurotransmitter would you expect to see in high quantities, if you could, in the brain of someone who has just been rewarded with a large raise in salary for all his or her hard work?
Answer:
Dopamine is the correct answer. Dopamine would be the neurotransmitter expected to be seen in high quantities in the brain of someone who has be rewarded.
Explanation:
Dopamine can be described as an important chemical that serves both as a hormone and as a neurotransmitter in the body.
One of the dopamine pathways in the brain is involved in sending signals for the reward system. This system is responsible for the generation of signals for reward or craving for rewards, positive attitude, pleasure etc. Hence, the neurotransmitter, dopamine would be present in enhanced quantities in the brain of a person who has been rewarded with pay raise.
Answer:
Dopamine
Explanation:
Dopamine can be described as an important chemical that serves both as a hormone and as a neurotransmitter in the body.
One of the dopamine pathways in the brain is involved in sending signals for the reward system. This system is responsible for the generation of signals for reward or craving for rewards, positive attitude, pleasure etc.
How is NADPH different from NADP+? A. It has lost one electron B. It has gained one electron C. It has gained one proton D. It has lost one proton
Answer: The correct answer is -
A. It has lost one electron.
Explanation:
NADPH acts as a reducing agent as it can donate electron to get converted to NADP+.
This means that NADP+ due to extra proton in its chemical structure, is an oxidised form of NADPH.
NADP+ is a significant molecule that is used in the movement of high energy electrons in several processes like photosynthesis.
Thus, when NADPH loses one electron, it produces NADP+.
NADPH differs from NADP+ in that it has gained one proton, transforming from its oxidized form (NADP+) to its reduced form (NADPH) through the addition of two electrons and one proton. Hence, the correct option is C.
NADPH differs from NADP+ in that it has gained one proton. This is because the reduction of NADP+ to NADPH involves the addition of two electrons and one proton. This process transforms NADP+, the oxidized form of the molecule, into NADPH, its reduced form. Essentially, NADPH holds more energy than NADP+ due to the gain of electrons and a proton, making it a crucial molecule in the photosynthetic process, where it acts as a carrier of electrons and protons.
Which of the following is a major disruptor of the carbon cycle?
A.
use of chemical fertilizers
B.
volcanic eruptions
C.
acid rain
D.
burning of fossil fuels
Burning of fossil fuels is a major disruptor of the carbon cycle.
How does burning of fossil fuels affects carbon cycle?Carbon that has been held underground for millions of years in coal, oil, and natural gas deposits is being released into the atmosphere at a rapid rate, causing a huge imbalance in the cycle.Carbon dioxide levels in the atmosphere and nitrogen levels in the biosphere have both risen dramatically as a result of human activity.Biodiversity, food security, human health, and water quality are all more vulnerable to climate change as a result of altered biogeochemical cycles.learn more about carbon cycle here:
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what does the golgi apparatus do?
Which term refers to the loss of fertile soil from drying out
Answer:
A desertification refers to the term which means desertlike conditions in a region. This region exhibit lack of water. Loss of fertile soil from drying out is desertification. The soil being exposed to warm weather conditions looses it's water content and becomes compact and hard.
Explanation:
Answer:
the answer is B desertification
Explanation:
just got it right on edge 2020
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Sickle-cell anemia is caused by a mutation in the gene encoding hemoglobin, causing red blood cells to appear
A. half-moon shaped.
B. like discs.
C. spherical.
D. long and stringy.
I believe the answer is C
Answer:
The correct answer would be option A. half moon shaped.
Explanation:
Sickle-cell anemia is a genetic disorder in which normal blood cells become rigid or stick and look like a crescent moon or half moon shape. In sickle-cell anemia condition, there are not sufficient healthy red blood cells or RBCs to carry enough oxygen throughout the body.
In sickle-cell anemia, the mutation causes a single change in the amino acid of hemoglobin, the building block of oxygen-transport protein. The alpha and beta subunits are the two subunits of hemoglobin. In sickle cell anemia, the beta subunit has valine at position 6 instead of glutamic acid that is present in normal hemoglobin.
Thus, the correct answer is option A. half moon shaped.
How does a skate differ from a lamprey
Explanation:
Bases on the structure of their mouth and the type of the skeleton, scientists have divided the fish into 3 main categories:
Jawless FishCartilaginous FishBony FishLampreys:
Lampreys belong to the first category i.e. Jawless Fish.Lampryes are mostly parasites and feed on other fish by sucking their blood and tissues using their suction like mouth structures. Their body is not covered with scales and they do not have a pair of fins.Skates:
Skates belongs to the second category i.e. Cartilaginous Fishes. They have jaws and pair of fine unlike Lampreys (Jawless Fish)Their bodies are covered with scales. These are carnivores.The two ends of a strand of DNA are called the
A. starting end and the ending end, based on the orientation of the DNA within the chromosome.
B. 5′ and the 3′ end, based on modifications in the deoxyribose sugar.
C. sense end and the antisense end, based on the location of the phosphate groups.
D. codon and the anticodon, based on the order of the deoxyribose sugars and the phosphate groups.
Answer:
The correct answer will be option B (5′ and the 3′ end, based on modifications in the deoxyribose sugar).
Explanation:
DNA is a large molecule which acts as genetic material of the organisms. DNA exists in intertwined double helical form consisting of two DNA chains or strands.
Each DNA strand is a long, continuous thread like structure made up of repeating units called nucleotides. Each nucleotide comprises of three subunits: five carbon sugar called deoxyribose, phosphate group and nitrogen-containing bases.
Each nucleotide is connected to next nucleotide by the formation of phopho-diester bond between free 5’ phosphate (PO³⁻₄ ) group of one nucleotide and the 3’-OH group of another deoxy-ribose sugar. This gives a phosphate-sugar-phosphate-sugar chain which forms the backbone of DNA molecule and is read in 5’ -> 3’ direction.
Thus, option B is the correct answer.
Data Analysis
Aquatic Organism pH Range for Life
Clam 4.5 - 5.0
Snail 5.0 - 9.0
Bass 5.5 - 9.0
Crayfish 5.5 - 8.5
Mayfly 5.5 - 9.0
Salamander 6.0 - 8.0
Trout 6.0 - 8.5
Perch 6.5 - 8.5
Frog 7.0 - 9.5
The EPA has recommended water quality criteria that include the pH in both freshwater and salt water. The recommended pH range for freshwater is 6.5 to 9.0, and for salt water it is 6.6 to 8.5. In the eastern United States, 75% of the lakes have a pH in the acidic range, from 6.5 to 4.2.
Based on this new information, what species are most likely to survive in eastern U.S. lakes, if the pH drops and remains at 4.2?
A) frogs
B) clams and snails
C) none of the species would survive
D) frogs, perch, trout, salamanders
Answer:
C) none of the species would survive
Explanation:
clam only goes down to a pH of 4.5
Answer:
The correct answer is C) none of the species would survive
Explanation:
According to the given data, the minimum pH range in which an organism can survive is 4.5-5.0 and that is for clam and that maximum range an organism can live is between 7.0-9.5 which is for frog.
Therefore according to data, no organism can live below pH 4.5 and above pH 9.5 or organism can only live between pH 4.5-9.5. So if the pH eastern U.S. lake drops to 4.2 than even clam will not able to survive in that lake.
This means the pH of the lake is too acidic for the survival of any species, therefore, the correct answer is C) None of the species would survive.
Which sexual transmission disease produces painful blisters in the jungle
Answer:
This sore is known as a chancre. Because this sore commonly occurs on the vulva, vagina, anus, or penis, syphilis most often is spread through sexual contact. The genital sores caused by syphilis also make it easier to become infected with and transmit HIV.
Explanation:
Genital Herpes and Chancroid are STIs that cause painful blisters or sores on the genitals, with Genital Herpes caused by a herpes virus and Chancroid by Haemophilus ducreyi.
Sexually Transmitted Infections (STIs) can present with various symptoms, including the occurrence of painful blisters. One such STI is Genital Herpes, which is caused by the herpes virus. Individuals with genital herpes experience painful blisters on the genitals that can reappear throughout one's lifetime. These outbreaks can be triggered by factors like stress and illness, and the likelihood of transmission is higher during these times. Another STI that results in genital sores is Chancroid, caused by Haemophilus ducreyi. It is characterized by soft, painful, open sores that may bleed or produce a highly contagious fluid
What part of the water cycle is occurring at point A
Where is point A?and add a photo or make a new question with the photo
what is not true about the Archean eon?
A. oldest fossil is found from this time period
B. formation of earliest solid rock
C. oxygen begins to appear in the atmosphere
D. Spanned from about 3.8 billion to about 2.5 billion years ago
Answer:
D. Spanned from about 3.8 billion to about 2.5 billion year ago
Explanation:
The Archean eon expanded from 4 billion years ago, until 2.5 billion years ago, being predeceased by the Hadean eon, and being followed by the Proterozoic eon. During this eon there were numerous very important things that happened. The first solid rocks were formed, thus the basis for the first continents arrived on the scene. The oldest fossils of living organisms are also dated to this eon, and they were the ones that started to slowly change the atmosphere by introducing free oxygen molecules to it.
9. How might an intense solar storm affect people on Earth?
The most powerful solar storms send coronal mass ejections (CMEs), containing charged particles, into space. If Earth happens to be in the path of a CME, the charged particles can slam into our atmosphere, disrupt satellites in orbit and even cause them to fail, and bathe high-flying airplanes with radiation.
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What happens during meiosis 1?
(A)Chromosome pairs separate and are distributed into new sex cells.
(B)Chromosome pairs remain together when new sex cells are formed.
(C)Two sex cells combine to form a single new cell.
(D)Each sex cell copies itself to form four new chromosomes.
The Answer D sound logical however I’m not sure about the 4 new chromosomes
During meiosis I, homologous chromosomes pair up, recombine through crossing over, and separate into two daughter cells, reducing the chromosome number from diploid to haploid.
During meiosis I, the main event is the separation of homologous chromosomes into two different daughter cells. Initially, homologous chromosomes pair up during prophase I, allowing for crossing over and genetic recombination, which introduces genetic variation. Each chromosome, consisting of two identical sister chromatids, then lines up with its homologous partner in the middle of the cell during metaphase I.
Following this alignment, the homologous pairs are pulled apart by the spindle fibers, and each moves towards opposite poles of the cell. This step ensures that each of the resulting two daughter cells contains just one chromosome from each pair, thereby reducing the chromosomal number by half, from diploid to haploid. Thus during meiosis I, chromosome pairs separate and are distributed into new sex cells, rendering answer choice (A) correct.
In general, due to the laws of physics, as magnification INCREASES in a microscope, the field of view A) blurs B) decreases C) doubles D) increases
Answer:
The answer is B) Decreases.
Explanation:
Let me know if I'm right.
Which best describes a bacterium?
This question isn't really finished, but bacterium are unicellular prokaryote.
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Which would not be considered a human activity contributing to be loss of biodiversity on earth
Human activities such as habitat destruction, introduction of invasive species, and over-harvesting are contributing factors to biodiversity loss. Ecosystem collapse as a result of these activities can significantly affect human welfare. Conversely, non-disruptive observation and conservation efforts are not considered to contribute to biodiversity loss.
Activities that contribute to the loss of biodiversity are numerous and include human endeavors such as habitat destruction, for instance, due to agriculture, urban expansion, and deforestation for logging or mining. Other contributing factors are the introduction of invasive species and over-harvesting of wild species.
Ecosystems such as tropical rainforests, which possess a high level of biodiversity, are being destroyed at an alarming rate for timber and agricultural land. Practices like these not only lead to the loss of individual species but can ultimately have dire consequences for human welfare due to ecosystem collapse.
A human activity that would not be considered contributing to biodiversity loss could be passive activities like observing wildlife without disturbing natural habitats, research, and conservation efforts.
How does water effect metamorphic process
Answer: The role of water in metamorphism is determined by the independent variables rock pressure, temperature, water pressure, and the amount of water present.
Explanation:
Answer:
1) Water pressures lower than the rock pressure cause metamorphic reactions to run at lower temperatures.
2) Water facilitates the transfer of ions between minerals and within minerals, and therefore increases the rates at which metamorphic reactions take place. So, while the water doesn’t necessarily change the outcome of a metamorphic process, it speeds the process up so metamorphism might take place over a shorter time period, or metamorphic processes that might not otherwise have had time to be completed are completed.
3) Water, especially hot water, can have elevated concentrations of dissolved substances, and therefore it is an important medium for moving certain elements around within the crust. So not only does water facilitate metamorphic reactions on a grain-to-grain basis, it also allows for the transportation of ions from one place to another. This is very important in hydrothermal processes, which are discussed toward the end of this chapter, and in the formation of mineral deposits.
Explanation:
differences between virus and bacterium
Answer:
A virus attaches itself to cells and usually reprograms them to reproduce itself. Also, unlike bacteria, most viruses do cause disease. Some virus-caused diseases include the common cold, AIDS, herpes, and chickenpox
Explanation:
Answer:
A virus can not be cured, but it can be treated to be better.
A bacterium can be cured.
Explanation:
HOW DO I EXPLAIN THAT?!
Identify the objective lens of the compound light microscope.
Answer:
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Answer:
The answer is actually C
Explanation:
Just took the test
Which is a frameshift mutation
Answer: if I’m correct it’s deletion
Explanation:
This is the normal nucleotide sequence on a DNA strand:
A-C-T-G-G-A-T
What is an insertion?
A. A-C-T-G-C-G-A-T
B. A-C-T-G-A-T
C. A-G-T-G-G-A-T
D. A-C-T-G-G-A-U
Answer:
A. A-C-T-G-C-G-A-T
Explanation:
An insertion is when a DNA base is added into a DNA strand usually from mutations.
One important disadvantage of radiation treatment is that ___.
A. Radiation kills cancer cells
B. Radiation cannot be focused, the entire body must be treated
C. Radiation must be delivered through an implanted device
D. Radiation kills cancer cells and healthy cells
Answer:D
Explanation:
Answer:
D) Radiation kills cancer cells and healthy cells
Explanation:
Small organisms, such as lichens, help break up bare rock into soil. A lichen is an example of a:
Succession
Primary Succession
Secondary Succession
Soil
Climax Community
Pioneer Species
Answer:
primary succession
Explanation:
Lichens are example of Primary succession and Pioneer species.
Answer: Option B & F
Explanation:
The lichens are nothing but combination of two microorganisms called fungi and algae. They survive together based on mutual benefit. Lichens are regularly the main creatures to colonize inhabitant rock.
They are in this manner the pioneer species in primary progression. Numerous life forms require soil before they can colonize a region. Lichens that colonize uncovered rock emit acids that separate the stone and start the dirt creation process.
Additionally, as lichens bite the dust, they give some natural issue that likewise adds to soil. Following this certain other events required for mature forest formation occurs.
CAN SOMEONE PLEASE HELP ME EITH THIS ASAP
For this assignment, you will demonstrate what you have learned about the properties of water by designing and
conducting an experiment that examines one of water's properties. First review this example of an experiment
designed to investigate waters specific heat.
Design and conduct an experiment to investigate water's surface tension.
To investigate water's surface tension, you can design an experiment that involves observing how water behaves with different substances placed on its surface. Start by filling a small container, such as a shallow dish or a petri dish, with water.
Then, carefully place various small objects, such as paperclips, coins, or small pieces of paper, on the surface of the water one at a time and observe what happens. Measure the number of objects that the water's surface can support before they sink. Repeat the experiment with different liquids, such as oil or rubbing alcohol, to compare their surface tension properties with that of water.
The surface tension of water is a result of the cohesive forces between water molecules, which causes them to attract and hold together at the surface. This experiment allows you to observe how surface tension affects the ability of water to support objects on its surface and compare it to other liquids. By understanding surface tension, you gain insight into one of the unique properties of water that plays a crucial role in various natural phenomena, such as the behavior of water striders on the surface of ponds or the formation of droplets on leaves.
Why might a farmer choose to install wind turbines rather than solar panels?
A. Wind turbines allow agricultural use of the land.
B. Wind turbines make less noise than solar cells.
C. Wind turbines harm fewer animals than solar cells.
D. Wind turbines are more reliable than solar cells.
Since wind turbines take less space than solar panels and may be installed in fields with crops and cattle, a farmer may decide to install wind turbines rather than solar panels. So, the correct option is A.
What are Wind turbines?Tall, tower-like devices called wind turbines are used to transform the kinetic energy of the wind into electrical energy. They typically consist of a nacelle (or housing), a tower, and a rotor (or blades).
A wind turbine is built with blades that are intended to harness wind energy and turn the rotor. The generator in the nacelle is connected to the shaft that the rotor is attached to. The generator is turned as the rotor revolves, transforming kinetic energy into electrical energy. The rotor and nacelle are supported by the tower, which also raises the blades high into the air to catch the wind.
Since wind turbines take less space than solar panels and may be installed in fields with crops and cattle, a farmer may decide to install wind turbines rather than solar panels.
Therefore, the correct option is A.
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Ignore the bottom question (how to know If gene therapy is successful)
Gene therapy is successful if the replacement gene is transcribed in the person's cells