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3 years ago

Identify all the amino acid-specifying codons where a point mutation (a single base change) could generate a nonsense codon.

Biology

1 answer:

Murrr4er [49]3 years ago

7 0

Answer:

Glutamic Acid (Glu): codons GAA, GAG

Glutamine (Gln): codons CAA, CAG.

Lysine (Lys): codons AAA, AAG, UCG

Serine (Ser): codons UCA, UCG

Leucine (Leu): codons UUG, UUA

Tyrosine (Tyr): codons UAC, UAU

Tryoptophan (Trp): codon UGG

Arginine (Arg): codons CGA, AGA

Glycine (Gly): codon GGA

Cysteine (Cys): codon UGU

Explanation:

Non sense codons are: UAA, UAG, UGA. Then following the genetic code (see attached file) a single base substitution in any of the codons indicated in the answer could generate a stop codon. This single base substitution might happen in the first, second or third base of the codon.

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One hundred vegetarian residents of a farming village raise various crops for their own consumption on a parcel of land. They sa

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Answer: D. at most 10

Explanation:

Using the energy pyramid, the ratio of grassland to primary consumer to secondary consumer is: 100:10:1 respectively.

Thus if the grassland supports 100 cattle (primary consumer), the numbers of humans (secondary consumer) the cattle can feed will be;

100/10 = 10.

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3 years ago

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qwelly [4]

Answer:

D.) both a and c

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3 years ago

Which of these terms describes the reaction of a plant to touch?

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The answer to this question is D

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3 years ago

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Which is an example of a scientist using a physical model to describe the solar system?

Elza [17]

Answer:

D. The scientist uses tennis balls to show the position of the planets and Sun.

Explanation:

In a layman's terms, the solar system is a system consisting of the sun and the planets that orbits around it. These planets are as follows; Mercury, Mars, Earth, Saturn, Venus, Jupiter, Neptune, Uranus etc.

According to this question, using a physical model to represent or describe the solar system means the use of physical objects that can easily be seen or identified. Based on this explanation, the use of tennis balls to show the position of the planets and Sun suits the physical model description of our solar system.

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3 years ago

Describe the actual and relative sizes of a virus, a bacterium, and a plant or animal cell.

anzhelika [568]

Answer :

The animals are categorized into 2 groups - eukaryotes and prokaryotes. The microbes like bacteria are coming under prokaryotes. They are unicellular organisms and without a true nucleus.

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Viruses like polio, flu virus sizes are 10nm. But some of the viruses are also less than 10nm. The size of bacteria is 1 micrometer. The viruses are 10 times smaller than the bacteria.

The eukaryotic organisms are more advanced and multicellular. Their cell size is larger than bacteria and viruses. The red blood cells under the light microscope are 8 micrometers. The typical animal cells like sperm are 60 micrometers and a skin cell is 30 micrometers. The plant cell for example pollen is 90 micrometers.

The eukaryotic cells sizes are more than prokaryotes like bacteria.

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3 years ago