Online Quiz 12

A Neurospora mutant cannot grow unless the amino acid, leucine, is added to its growth medium. This strain is
d. wild-type for the synthesis of all amino acids except for leucine.
Textbook Reference: 12.1 What Is the Evidence that Genes Code for Proteins? p. 257

When examining the genetic code, it is apparent that
c. there can be more than one codon for a particular amino acid.
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 263

Which of the following is not a characteristic of RNA?
e. RNA contains more bases than DNA.
Textbook Reference: 12.2 How Does Information Flow from Genes to Proteins? p. 260

Anticodons are made of mRNA.
b. False
Textbook Reference: 12.4 How Is RNA Translated into Proteins? p. 266

Beadle and Tatum originally proposed the one-gene, one-enzyme hypothesis. Today, this hypothesis could be restated in which of the following ways?
e. A given sequence of DNA nucleotides contains the information to make one enzyme.
Textbook Reference: 12.1 What Is the Evidence that Genes Code for Proteins? p. 257

Which of the following is not a phase that occurs during translation?
c. Conjugation
Textbook Reference: 12.4 How Is RNA Translated into Proteins? p. 269

A mutation that arises from a single base change in a codon ___ the amino acid coded for.
c. may or may not change
Textbook Reference: 12.6 What Are Mutations? p. 275

A mutation that occurs when a mutagen causes a permanent change in DNA is
d. induced mutation.
Textbook Reference: 12.6 What Are Mutations? p. 277

An initiator methionine–tRNA complex is positioned at the AUG start codon in order to start elongation in protein synthesis.
a. True
Textbook Reference: 12.4 How Is RNA Translated into Proteins? p. 268

The termination of transcription is signaled by
b. a sequence of bases.
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 262

Triplet codons
e. can be stop codons or start codons.
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 263

Put the following events about protein synthesis in chronological order. (1) After peptide linkage, the empty P site tRNA shifts to an exit site on the ribosome. (2) The ribosome releases the empty tRNA as it translocates the length of one codon. (3) The next tRNA binds the A site. (4) A tRNA is positioned at the AUG start codon. (5) The amino acid at the P site is transferred to the amino acid attached to the tRNA at the A site. (6) The A site is now free for the next incoming tRNA.
d. 4; 3; 5; 1; 2; 6
No Textbook Reference

The main difference between DNA and RNA is that
c. DNA lacks a 2′ hydroxyl group.
Textbook Reference: 12.2 How Does Information Flow from Genes to Proteins? p. 260

RNA polymerase
d. Both a and b
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 262

Which of the following is a function of tRNA?
b. It transports amino acids.
Textbook Reference: 12.4 How Is RNA Translated into Proteins? p. 266

Which of the following is the correct order in which a charged tRNA travels?
c. T site; A site; P site; E site
Textbook Reference: 12.4 How Is RNA Translated into Proteins? p. 268

Which of the following is a stop codon?
a. UAA
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 263 and Figure 12.6

Which of the following single base substitutions in the sense strand of DNA would cause a change in phenotype?
c. ATG to ATT
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 263

Which of the following about the genetic code is true?
a. It is degenerate.
Textbook Reference: 12.3 How Is the Information Content in DNA Transcribed to Produce RNA? p. 263

Which of the following was hypothesized to have traveled through the nucleus to the cytoplasm, where it served as a template for the synthesis of proteins?
b. mRNA
Textbook Reference: 12.2 How Does Information Flow from Genes to Proteins? p. 260 and Figure 12.2

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