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Ganezh [65]
3 years ago
14

Norman thinks that the brain function of students suffers when they receive less sleep. He predicts that students who get less s

leep before an exam will receive lower test grades. To investigate his idea, he tests two groups of chemistry students. Group 1 receives four hours of sleep, while Group 2 receives the recommended eight hours of sleep the night before the exam. Both groups consume the same foods before testing. They then take the same exam in the same room. What experimental factors could have been a possible source of error in Norman's investigation?
A. the food students consumed before the exam
B. the amount of sleep students received before the exam
C. the grades students earned on their exam
D. the temperature and light of the testing room
Biology
1 answer:
tekilochka [14]3 years ago
8 0
B. The amount of sleep students received before the exam
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A single nucleotide-pair substitution missense mutation causes a change of a single amino acid into another. Aa a result, the produced protein will have an almost normal sequence except for one amino acid.

On the other hand, a frameshift mutation changes the Open Reading Frame (ORF) of the ribosome. The ribosome moves along the mRNA every three nucleotides (codons) and translates them into amino acids that will form the nascent protein. If there is a frameshift mutation (an insertion or deletion of a number of nucleotides not multiple of three) the ribosome will "read" the mRNA differently and will identify different codons than the wild-type sequence, so a large number of amino acids will be different in the mutated protein.

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A medical test indicates that a patient has a defective protein. This
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number of nitrogen bases

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<em>The correct answer would be the number of nitrogen bases.</em>

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