FREE AND STUDY GAMES ABOUT DNA TEST

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FREE AND STUDY GAMES ABOUT DNA TEST

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -15 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: The nitrogenous base adenine is found in all members of which group?

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ATP, RNA, and DNA Question 2: The "universal" genetic code is now known to have exceptions. Evidence for this can be found if which of the following is true?

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If UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only).Question 3: Which of the following variations on translation would be most disadvantageous for a cell?

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translating polypeptides directly from DNA Question 4: The TATA sequence is found only several nucleotides away from the start site of transcription. This most probably relates to which of the following?

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the number of hydrogen bonds between A and T in DNA

Question 5: The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following?

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A gene from an organism can theoretically be expressed by any other organism.Question 6: Garrod hypothesized that "inborn errors of metabolism" such as alkaptonuria occur because

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metabolic enzymes require vitamin cofactors, and affected individuals have significant nutritional deficiencies.Question 7: Which of the following provides some evidence that RNA probably evolved before DNA?

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DNA polymerase uses primer, usually made of RNA.Question 8: A particular triplet of bases in the template strand of DNA is 5' AGT 3'. The corresponding codon for the mRNA transcribed is

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3' UCA 5'.

Question 9: A part of the promoter, called the TATA box, is said to be highly conserved in evolution. Which of the following might this illustrate?

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Any mutation in the sequence is selected against.Question 10: Which of the following nucleotide triplets best represents a codon?

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a triplet in the same reading frame as an upstream AUG Question 11: Which of the following does not occur in prokaryotic eukaryotic gene expression, but does in eukaryotic gene expression?

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A poly-A tail is added to the 3' end of an mRNA and a cap is added to the 5' end.

Question 12: Transcription in eukaryotes requires which of the following in addition to RNA polymerase?

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several transcription factors (TFs)

Question 13: Which of the following is a function of a poly-A signal sequence?

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It codes for a sequence in eukaryotic transcripts that signals enzymatic cleavage ~10?35 nucleotides away.Question 14: In eukaryotes there are several different types of RNA polymerase. Which type is involved in transcription of mRNA for a globin protein?

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RNA polymerase II Question 15: Which of the following statements best describes the termination of transcription in prokaryotes?

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RNA polymerase transcribes through the terminator sequence, causing the polymerase to separate from the DNA and release the transcript.