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Licemer1 [7]
3 years ago
6

Platelets ________. platelets ________. have multiple nuclei are the precursors of leukocytes stick to the damaged area of a blo

od vessel and help seal the break have a life span of about 120 days
Biology
1 answer:
vampirchik [111]3 years ago
5 0
The answer would be:

Platelets stick to the damaged area of a blood vessel and help seal the break.

Platelets are blood cells that play a role in blood clot formation. It also helps with blood vessel repair. The process by which platelets stick to the damaged area of a blood vessel is called adhesion. When platelets stick to the damaged blood vessels they release chemical signals to attract more platelets to the site of injury
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Who was the author of the book Principles of Geology? The book presented arguments to support a theory of geological change, pro
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Answer:

The correct answer is "Charles Lyell".

Explanation:

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3 years ago
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Note the two transcribed and translated DNA strips below. The two strips are identical except for a point mutation, where the fi
jekas [21]

Full question attached

Answer/ Explanation:

The original DNA sequence has a point mutation changing a G to a T. The resulting mRNA produced is always complementary to the DNA from which it is synthesised, so the original mRNA sequence has a T, whereas the mutated mRNA has a U. The tRNA is complementary to the mRNA, so the original has a G, and the mutated has a T.

<h3>Original DNA</h3>

GTTGGCGAATGAACGGAGGCTGACGTCTAAGCCTAGAAAAATTGG

RNA

CAACCGCUUACUUGCCUCCGACUGCAGAUUCGGAUCUUUUUAACC

tRNA

GUUGGCGAAUGAACGGAGGCUGACGUCUAAGCCUAGAAAAAUUGG

<h3>_______________________________________________</h3><h3>Mutated DNA</h3>

GTTGGCGAATGAACTGAGGCTGACGTCTAAGCCTAGAAAAATTGG

RNA

CAACCGCUUACUUGUCUCCGACUGCAGAUUCGGAUCUUUUUAACC

tRNA

GUUGGCGAAUGAACTGAGGCUGACGUCUAAGCCUAGAAAAAUUGG

This is a point mutation called a substitution. This does not affect the entire sequence of the protein, because the mutation is "in frame" meaning the mRNA sequence is still read in the same way by the protein producing machinery. However, it does change the 5th codon from UGC to UGU. If we look up the genetic code, we can see that both of these codons code for cysteine, so there will be no change in the amino acid sequence of the protein

5 0
3 years ago
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