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AP Biology Unit 6B: Transcription, Translation & Gene Expression — practice questions — page 2

Explore 83 free Unit 6B: Transcription, Translation & Gene Expression questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 6B: Transcription, Translation & Gene Expression questions and exercises with answers

Showing questions 31–60 of 83.

The nucleotide pair corresponding to the first messenger RNA nucleotide transcribed is called the:Read the answer and worked solution →Transfer RNA folds so that the amino acid binding site sits at one end and at the other end sits the:Read the answer and worked solution →The transcription elongation phase in prokaryotes begins with the release from the polymerase of the:Read the answer and worked solution →Inserting one or two nucleotides changes the triplet reading frame, altering the message for:Read the answer and worked solution →The universality of the genetic code is described as powerful evidence that life on Earth shares:Read the answer and worked solution →Sixty-four codons encode about twenty amino acids, which requires the code to be:Read the answer and worked solution →At the start of the elongation phase of translation, the initiating methionyl transfer RNA occupies the:Read the answer and worked solution →Once a prokaryotic gene is transcribed, termination signals instruct the polymerase to:Read the answer and worked solution →Match each gene expression termRead the answer and worked solution →Which geneticist wrote that nothing makes sense in biology except in the light of evolution?Read the answer and worked solution →Which ancient Greek philosopher emphasized that species were static and unchanging?Read the answer and worked solution →Which Scottish geologist proposed that geological change accumulates gradually over long periods?Read the answer and worked solution →Darwin traveled around the world on HMS Beagle from:Read the answer and worked solution →The Galapagos Islands, where Darwin studied finches, lie west of:Read the answer and worked solution →Darwin noted seed-eating finches had which kind of beak?Read the answer and worked solution →Darwin's three principles behind natural selection: traits are inherited, more offspring are produced than survive, and:Read the answer and worked solution →Darwin and Wallace's understanding of limited resources came from reading economist:Read the answer and worked solution →Darwin called the change in populations over generations:Read the answer and worked solution →In 1858 Darwin and Wallace presented papers on natural selection at the:Read the answer and worked solution →Peter and Rosemary Grant have studied Galapagos finches every year since:Read the answer and worked solution →After an El Nino left few large hard seeds on Daphne Major, average finch bill size became:Read the answer and worked solution →The ultimate source of new alleles in a population is:Read the answer and worked solution →A snow leopard's thick fur that helps it survive the cold is an example of an:Read the answer and worked solution →Wings that evolved separately in bats and insects illustrate:Read the answer and worked solution →Bones in human, dog, bird and whale limbs sharing the same layout are:Read the answer and worked solution →Wings on flightless birds and hind leg bones in whales are examples of:Read the answer and worked solution →All vertebrate embryos, including humans, show which structures early in development?Read the answer and worked solution →The supercontinent Pangaea broke up about how many years ago?Read the answer and worked solution →A group of individuals that interbreed and produce fertile, viable offspring is a:Read the answer and worked solution →Speciation involving geographic separation of populations is:Read the answer and worked solution →

Worked practice questions

The nucleotide pair corresponding to the first messenger RNA nucleotide transcribed is called the:

  1. Initiation site
  2. Termination site
  3. Anticodon site
  4. Ribosome site
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Correct answer: A. Initiation site

1. Transcription has a numbered starting point. 2. One nucleotide pair in the DNA double helix marks where the first mRNA nucleotide is transcribed. 3. That pair is called the plus one site, or the initiation site. 4. Elongation then proceeds away from it. _Source: OpenStax Biology 2e (CC BY 4.0), Ch 15 'Genes and Proteins', sections 15.1-15.5_

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Transfer RNA folds so that the amino acid binding site sits at one end and at the other end sits the:

  1. Polymerase
  2. Anticodon
  3. Promoter
  4. Ribosome
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Correct answer: B. Anticodon

1. Transfer RNA has to match a codon and carry an amino acid at once. 2. The transfer RNA folds into a specific shape. 3. It positions the amino acid binding site at one end. 4. At the other end it positions the anticodon. _Source: OpenStax Biology 2e (CC BY 4.0), Ch 15 'Genes and Proteins', sections 15.1-15.5_

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The transcription elongation phase in prokaryotes begins with the release from the polymerase of the:

  1. Promoter region
  2. Ribosomal RNA
  3. Sigma subunit
  4. Template strand
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Correct answer: C. Sigma subunit

1. Elongation is marked by a specific departure from the enzyme. 2. Transcription in prokaryotes moves from initiation into elongation. 3. The transcription elongation phase begins with the release of the sigma subunit. 4. It is released from the polymerase. _Source: OpenStax Biology 2e (CC BY 4.0), Ch 15 'Genes and Proteins', sections 15.1-15.5_

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