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3 years ago

There are 20 naturally occurring amino acids, therefore, there are only 20 mRNA codons. True or false

Biology

1 answer:

weqwewe [10]3 years ago

4 0

Answer:

False. There are 20 amino acids, but 64 possible codons.

Explanation:

Genetic information for the aminoacids assembly during the protein synthesis is stored in short sequences of three nucleotides named codons in the mRNA. Each of the codons represents one of the 20 amino acids used to build the protein. The total number of possible codons is 64, from which 61 codify amino acids -more than one codon codify for the same amino acid-. One of these amino acids is also the start point of protein synthesis. And the left three codons are stopping translation points.

The codons indicating the initiation or stop points during the translation process are:

• The start codon AUG is the most common sequence used by eukaryotic cells and places near the 5´extreme of the molecule. However, other codons might be used as well. Prokaryote cells might use the codons GUG or UUG.

• The end codons are UAA, UAG, UGA.

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In a particular breed of cattle, the trait of not having horns (Pp) is dominant over having horns (pp). The Punnett square below

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Answer:

C.50%

Explanation:

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3 years ago

Nearly all earths energy come from what

vfiekz [6]

Nearly all of the energy comes from the sun

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In a plant called jimsonweed, flowers can be white or purple. A jimsonweed plant with white flowers is crossed with a jimsonweed

STALIN [3.7K]

Answer:

Although statements are not given in the question, we could make the most possible deduction as follows:

The allele for purple flowers is dominant whereas allele for white flowers is recessive.

Explanation:

According to the question,

Purple flower plant was crossed with white flower plant.
All offsprings have purple flowers.

Here we have one possibility that both parents were homozygous but in their own traits. Purple flower plants were "PP" and white flower plants were "pp" So, the first progeny (direct offsprings) would have "Pp". So, as per considerations, purple is dominant allele which will mask the recessive allele thus defining the color of all offsprings as purple. However, further cross of their generation will definitely end up into purple and white flowers (3:1) but this condition is not mentioned in the statement.

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3 years ago

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. I

Wewaii [24]

Answer:

D) The lac operon will function normally.

Explanation:

The promoter area can be described as the area that causes the transcription to initiate for a particular gene. Promoters may be near the genes from which they initiate transcription or they may display multiple scenes upstream.
The lock operon works normally because the promoter area can still enable transcription on many base pairs. Detects repression promoter and works normally.
so correct option is D) The lac operon will function normally.

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3 years ago

How are the retinas of night hunting animals different from day hunting animals?

Murrr4er [49]

The retinas of night hunting animals have more rod cells which enable them to see better with minimum light.

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3 years ago