Neutral theory proposes that
A) molecular clocks are more reliable when the surrounding pH is close to 7.0.
B) most mutations of highly conserved DNA sequences should have no functional effect.
C) DNA is less susceptible to mutation when it codes for amino acid sequences whose side groups (or R groups) have a neutral pH.
D) DNA is less susceptible to mutation when it codes for amino acid sequences whose side groups (or R groups) have a neutral electrical charge.
E) a significant proportion of mutations are not acted upon by natural selection.
Answer:
The correct answer is E) a significant proportion of mutations are not acted upon by natural selection.
Explanation:
The neutral theory, proposed by Motoo Kimura in 1968, proposes that part of the molecular variability produced by mutations that exists in populations is natural variability, that is, a large part of the genetic variation observed in populations is due to random fluctuation of genetic variants that are neutral, on which natural selection hardly acts, so they are not an evolutionary force since they do not contribute predominantly to natural selection and proposes genetic drift as an evolutionary mechanism.
Glycolysis occurs during aerobic or anaerobic conditions.
True
False
pls help
Answer:
true
Explanation:
Glycolysis occurs in both aerobic and anaerobic states. In aerobic conditions, pyruvate enters the citric acid cycle and undergoes oxidative phosphorylation leading to the net production of 32 ATP molecules. In anaerobic conditions, pyruvate converts to lactate through anaerobic glycolysis
Synthetic fiber has many characteristics that makes it more attractive than natural fiber for making clothing. Which of the following choices are true
1. Synthetic fiber has greater shape retention
2. Synthetic fiber often costs less
3. ALL options are correct
4. Synthetic fiber has greater durability
5. Synthetic fiber is more prone to heat damage in the wash than natural fibers
Answer:
C
Explanation:
Answer:
C
Explanation:
Which website to search for bio answers faster and more answers？
Answer:
Brainly isgood
Explanation:
How do the resources available to people influence how they
grow food?
Answer:
grow
Explanation:grow
Decomposers are important in the environment because they
A. convert large molecules into simpler molecules that can then be recycled
B. release heat from large molecules so that the heat can be recycled through the ecosystem
C. can take in carbon dioxide and convert it into oxygen
D. convert molecules of dead organisms into permanent biotic parts of an ecosystem
Answer:
D
Explanation:
Decomposers are important in the environment because they convert molecules of dead organisms into permanent biotic parts of an ecosystem. So, the correct option is (D).
What are Decomposers?Living organisms such as micro-organisms that convert dead plants and animals into humus are known as decomposers. Fungi and bacteria fall in this category. It recycles and converts the dead matter into humus which mixes with the soil of the forest. It provides essential nutrients to the plants. It is also known as detritivores.
There are four types of decomposers, namely
FungiInsectsEarthwormBacteriaThese types of organisms decompose or break down organic matter such as the remains of dead organisms, carrying out the process of decomposition, which occurs after the death of all living organisms.
They are also called reducers because they are able to remove or degrade dead bodies of organisms and because of their small size they are known as micro consumers.
Thus, Decomposers are important in the environment because they convert molecules of dead organisms into permanent biotic parts of an ecosystem. So, the correct option is (D).
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Directions: Consider a pedigree that is tracking an autosomal recessive trait, where two recessive alleles (tt) result
in the inability to taste a chemical known as PTC. The ability to taste PTC is determined by the presence of a
dominant allele (T). Complete the missing boxes in the chart. The first row has been done for you as an example!
Note: The ability to taste PTC may be more complex than a simple gene trait.
Individual Phenotype
Shaded?
PTC taster
Shape (in Pedigree)
Square
2.
No
1.
3.
4.
5.
6.
Male with genotype TT
Male with genotype Tt
Male with genotype tt
Female with genotype TT
Female with genotype Tt
Female with genotype tt
7.
8.
9.
10.
11.
12.
13.
14.
15.
identify the kind of digestion that takes place in the mouth
Mechanical digestion takes place in the mouth
In unicellular organisms a single cell carries out all life processes then why do multicellular organisms need tissues?
Answer:
Its very easy here see we human being and animals are mutlicelluar organism We have different cells which form tissues and tissues forms organs and organs form human body
Each and every cells and tissues have their own work and functions to do
Which means that if we have absence of heart in our body we can't live because heart tissues help us ro Survive
what event occured during paleozoic era?
A. diversification of mammals
B. beginning of multicelled life
C. first appearance of most invertebrates
D. dominance of non avian dinosaurs
Answer:
C) first appearance of most invertebrates.
Explanation:
The Cambrian Explosion occurred 542 mya. The earliest complex animals arose in the sea at the beginning of the Cambrian Explosion. It would take another half a billion years for mammals to rise. Multicellular life dates back 1.2 bya, but more cpomplex life, such as animals, did not occur until the Cambrian Explosion. In the beginning of the Cambrian Explosion, many soft-bodied animals, such as jellyfish and sea anemones appeared.
Answer:
C
Explanation:
First appearance of most invertebrates
Write a short note on broyophytes?
Answer:
Bryophytes are an informal group consisting of three divisions of non-vascular land plants: the liverworts, hornworts and mosses. They are characteristically limited in size and prefer moist habitats although they can survive in drier environments. The bryophytes consists of about 20, 000 plant species.
[tex]\underline{QUESTION:_}[/tex]
[tex]Write~ a ~short~ note ~on~ bryophytes?[/tex]
-----------------------------------------------
[tex]\underline{ANSWER:-}[/tex]
Bryophytes are a loose classification of three non-vascular land plant embryophytes: liverworts, hornworts, and mosses. They are typically small and prefer damp surroundings, however, they may thrive in drier ones. There are over 20,000 plant species in the bryophytes.[tex]\underline{-----------}[/tex]
[tex]\textnormal{HOPE IT HELPS}[/tex]
[tex]\textnormal{HAVE A GREAT DAY!!}[/tex]
plz can anyone write an essay about water pollution about 1300 words
Answer:
Explanation:
The biological or chemical change in the quality of water due to the presence of contaminants in water is called water pollution. Most of this contamination as on date is due to various human activities. In fact, humans are responsible for the mass deaths of whales and other aquatic organisms often swept ashore at different beaches in the world. There is an urgent need to look into the measures to control water pollution although a lot many efforts and schemes have already been announced by the Government in this regard. To make the students aware of this we have prepared short and long essays for students which shall inform them about water pollution and the means to minimise it.
State 3 characteristics of iodated salt
Answer:
1. soluble in water
2. White Crystalline Powder
3. Transparent and Colorless
In a non-mutated DNA strand, what base pairs with guanine?
Answer:
Attached to each sugar is one of four bases--adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
Explanation:
Answer:
cytosine pairs with guanine.
You have joined a lab studying DNA replication in E. coli. The graduate student you are working with has identified a mutation in primase that makes primase very inefficient. Your project is to characterize the cells with this mutation. Predict the defects you would most likely see in the mutant E. coli cells. Choose one or more: A. a delay in the unwinding of DNA B. rapid lagging-strand synthesis but slow leading-strand synthesis C. a delay in DNA polymerase beginning synthesis D. a longer total time to replicate DNA E. inefficient Okazaki fragment joining
Answer:
C. a delay in DNA polymerase beginning synthesis
D. a longer total time to replicate DNA
Explanation:
DNA primases are RNA polymerases that play an active role during DNA replication by catalyzing the synthesis of short RNA sequences or 'primers' that are complementary to a single-stranded piece of DNA (i.e., to the DNA template). Primases are continuously required at the DNA replication fork before DNA replication can occur. Moreover, DNA polymerases always require a pre-existing primer sequence to initiate DNA chain elongation, thereby it is expected that an inefficient primase delay the DNA replication process and DNA polymerase activity.
Why does tissue fluid does not contain RBC?
Explanation:
The plasma that filters through the blood capillaries into the interstitial fluid does not contain red blood cells or platelets as they are too large to pass through but can contain some white blood cells to help the immune system.
Someone pls help me ill give out brainliest pls don’t answer if you don’t know
Which gland helps fight against cold
A. Pituitary gland
B. Thyroid
C. Adrenal gland
D. Pancreas
Answer:
A. Pituitary gland
Explanation:
Write the equation for cellular. Plz help!!!!
Answer:
C 6 H 12 O 6 + 6 O 2 --> 6 CO 2 + 6 H 2 O + ATP
Explanation:THANK ME LATER
Herbicides are chemicals that kill plants by interrupting important biological processes. Different herbicides affect different plant processes. The herbicide atrazine prevents the chemical reactions that use energy from sunlight.
A plant is sprayed with atrazine.
Exposure to atrazine causes an immediate decrease in the production of two substances in plant. Select the substance.
A. DNA
B. Carbon dioxide
C. Oxygen
D. Phospholipids
Answer:
oxygen because that's one of the substance that plants produce.
You can also do this by the process of elimination. Knowing that atrazine impedes the production of substances in plants, we know that it can't be DNA and Phospholipid. Carbon Dioxide is used by plant, not produced; thus, oxygen is the answer.
A herbicide is a type of pesticide that is used for controlling the weeds so that the plants can get nourishment. They are common weed killers used to clear taw waste groups and constructional areas.
These herbicides are used for different plants and prevents the chemical reaction that makes use of energy. The plants are sprayed with the chemical called atrazine which is used to decrease the production of oxygen.Hence the option C is correct.
Learn more about the kill plants by interrupting important biological.
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All of the prairie dogs that live in a town make up
Answer:
Black-tailed prairie dogs are social animals that live in towns, or colonies, which are further divided into familial neighborhoods, or coteries. The number of prairie dogs in each town can fluctuate, but will normally amount to 12 individuals per 2.5 acres (1 hectare).
5. Microwave
Situation: John saw his mother place a cold bread inside a microwave oven. After 3 minutes, his mom removed the bread from the oven and gave it to John John observed that the bread is warm after it was placed in the microwave oven. John wondered what caused the cold bread to warm up after it was placed in the microwave oven.
Observation/s:
Inference:
Which of the following is an example of artificial selection?
Answer: last option
Explanation:
artificial selection is when humans basically pick a desirable trait in a species and take steps to enhance or perpetuate that specific trait so that it's more common
the best option to describe this is the last one, because humans have bred domestic dogs to be less aggressive and more playful or friendly
Which cells lack of nucleus ?
A. Muscle cell
B. Euglena
C. Fungal cell
D. Bacterial cell
Answer:
D. Bacterial cell
Explanation:
What is the difference between a hepatic duct and a hepatic vein?
Explanation:
The liver is connected to two large blood vessels, the hepatic artery and the portal vein. The hepatic artery carries blood from the aorta to the liver, whereas the portal vein carries blood containing the digested nutrients from the entire gastrointestinal tract, and also from the spleen and pancreas to the liver.
Question 7 of 25
Which structure is used by the organism to see the outside world?
Answer:
install
Explanation:
Answer:
Eye
Explanation:
We use the eye to look at things
44. A food handler does NOT need to worry about time and temperature control when handling which food?
Steamed rice
Cooked beans
Grilled steak
Warmed tortillas
QUESTIONZANSY
Which of the following objects could be used to model the structure of a DNA molecule?
A. a snowflake
B. a ladder
c. a three-dimensional cube
D. a branching tree
Answer:
Ladder
Explanation:
The structure of the double helix is often described as being like a ladder that has been twisted into a spiral shape. Therefore, option (B) is correct.
What is the structure of DNA?DNA (deoxyribonucleic acid) is a long, linear polymer that is made up of repeating units called nucleotides. Each nucleotide consists of a sugar (deoxyribose), a phosphate group, and one of four nitrogenous bases: adenine (A), guanine (G), cytosine (C), or thymine (T). The sequence of these nitrogenous bases determines the genetic information encoded in DNA.
One of the most common models for the structure of DNA is the "double helix" model, which was proposed by James Watson and Francis Crick in 1953. This model depicts DNA as a double-stranded helix that is held together by hydrogen bonds between the complementary nitrogenous bases A and T, and G and C. The two strands of the helix are antiparallel, meaning that they run in opposite directions. The structure of the double helix is often described as being like a ladder that has been twisted into a spiral shape.
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8. The process that occurs only in the small intestine to increase the absorption of
food and nutrients by mixing food.
A. Digestion
C. Absorption
B. Peristalsis
D. Segmentation
Answer:
leleekkelele
Explanation:
e!!e!e!we!!eleel
e!e!elele
which organism has the least energy grass--> rabbit--->raccoon---> wolf
Answer:
The Wolf
Explanation:
Food chain follows a law called 10% Law.
It follows that the carnivores (secondary consumers) that feed on herbivores and detritivores and those that eat other carnivores (tertiary consumers) have the lowest amount of energy available to them.
Hence wolf has the least energy
