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Pepsi [2]
3 years ago
12

Which life-form existed on Earth for the shortest period of time?

Biology
2 answers:
Elza [17]3 years ago
7 0

Answer:

The dinosaurs existed on Earth for the shortest period of time.

Explanation:

I promise...

vovangra [49]3 years ago
3 0

Answer:placoderm fish

Explanation:I was taking a test and that was the answer

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Imagine that a mutation in DNA produces a protein with a slightly different amino acid sequence. how would this mutation affect
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Answer:

It would most likely render the protein nonfunctional or mis-functional.

The mutation could result in three outcomes:

  1. Silent mutation, which changes the codon to the same amino acid. (AAA->AAG, both are lysine). But since the problem specified that it has a "slightly different amino acid sequence," we can assume this doesn't happen.
  2. Nonsense mutation, which changes a codon to a stop codon. This would end the chain of amino acids, making the protein potentially nonfunctional.
  3. Missense mutation, which changes a codon to another completely different codon. This can be harmful, as in sickle-cell disease, where just one amino acid, glutamic acid, is changed to valine.

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3 years ago
How is the earth oriented to the sun
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Answer:

the orientation of Earth's tilt with respect to the sun – our source of light and warmth – does change as we orbit the sun. In other words, the Northern Hemisphere is oriented toward the sun for half of the year and away from the sun for the other half.

Explanation:

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2 years ago
Which of the following statements is NOT true of transpiration
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Answer:

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I am working on that kind of stuff right now

4 0
2 years ago
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In Andalusian fowl, B is the gene for black plumage (head feathers) and B' (pronounced "B prime") is the gene for white plumage.
svet-max [94.6K]

INCOMPLETE DOMINANCE INHERITANCE:

<span>5.  In Andalusian fowl, B is the gene for black plumage (head feathers) and B' (pronounced "B prime") is the gene for white plumage.  These genes, however, show incomplete dominance.  The heterozygous (BB') condition results in blue plumage.  List the genotypic and phenotypic ratios expected from the following crosses:  a) black x blue  b) blue x blue  c) blue x white</span>

<span>6. </span><span>In snapdragons, petal color is determined by a single gene locus with two alleles making the "red" allele (R) incompletely dominant to the "white" allele (r).  Heterozygotes have petals, which are neither red nor white, but pink.  a) If a true-breeding red flower is pollinated with pollen from a white flower: What fraction of the seeds (F1 generation) would be expected to produce red-flowered plants?  What fraction of the gametes produced by the F1 plants would be expected to bear the R allele?  b) If two pink flowered plants are crossed, what genotypic and phenotypic ratios are expected among the offspring (F1 generation)?</span>

4 0
3 years ago
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Food contains __________; however, some food is a better/richer source than others.
Elena L [17]
Food contains nutrients;however some foods is a better/richer sorce than others.

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