BIOl 1009 MT2 Review (Ch16-17)

b. AAA

A particular triplet of bases in the coding strand of a gene is TTT. If an mRNA is made from this gene, the anticodon on the tRNA that will bind the codon on the mRNA is a. UUU b. AAA c. GGG d. TTT

d. just one amino acid, but several tRNAs

A single aminoacyl tRNA synthetase can typically recognize a. just one amino acid and just one tRNA b. multiple amino acids, but just one tRNA c. multiple amino acids and multiple tRNAs d. just one amino acid, but several tRNAs

c. bonding of the anticodon to the codon and the attachment of amino acids to tRNAs.

Accuracy in the translation of mRNA into the primary structure of a polypeptide depends on specificity in the a. attachment of amino acids to tRNAs. b. binding of ribosomes to mRNA. c. bonding of the anticodon to the codon and the attachment of amino acids to tRNAs. d.bonding of the anticodon to the codon.

b. If UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only).

The "universal" genetic code is now known to have exceptions. Evidence for this can be found if which of the following is true? a. If prokaryotic organisms are able to translate a eukaryotic mRNA and produce the same polypeptide. b. If UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only). c. If several codons are found to translate to the same amino acid, such as serine. d. If one stop codon, such as UGA, is found to have a different effect on translation than another stop codon, such as UAA.

c. sequence of bases

The DNA molecule is able to carry a vast amount of hereditary information in which of the following? a. side groups of nitrogenous bases b. complementary pairing of bases c. sequence of bases d. phosphate-sugar backbones

c. complementary to the corresponding mRNA codon.

The anticodon of a particular tRNA molecule is a. changeable, depending on the amino acid that attaches to the tRNA. b. complementary to the corresponding triplet in rRNA. c. complementary to the corresponding mRNA codon. d. the part of the tRNA that bonds to a specific amino acid.

b. All of these answers are correct.

Transfer RNAs, or tRNAs a. contain an anticodon that base pairs with an appropriate codon on a mRNA molecule b. All of these answers are correct. c. bind only a specific amino acid d. have 3-dimensional shapes that are formed by hydrogen bonding between the nitrogenous bases of some of the ribonucleotides comprising the tRNA

d. nucleosome, 30-nm chromatin fiber, looped domain NOTE: looped domain is 300-nm chromatin fiber

Which of the following represents the order of increasingly higher levels of organization of chromatin? a. looped domain, 30-nm chromatin fiber, nucleosome b. 30-nm chromatin fiber, nucleosome, looped domain c. nucleosome, looped domain, 30-nm chromatin fiber d. nucleosome, 30-nm chromatin fiber, looped domain

d. 5' and 3' untranslated regions (UTRs) are parts of exons, but do not code for proteins.

Which of the following statements is TRUE? a. Many prokaryotic primary mRNA molecules have "intervening" sequences, or introns, that do not code for proteins. b. All of these statements are true. c. Many prokaryotic genes have "intervening" sequences, or introns, that do not code for proteins. d. 5' and 3' untranslated regions (UTRs) are parts of exons, but do not code for proteins.

c. all of these statements are true

Which of the following statements regarding primases is TRUE? a. Primases can initiate synthesis of a new nucleotide chain b. Primases catalyze the formation of an RNA molecule c. all of these statements are true d. Primases add nucleotides to the 3' end of a nucleotide or nucleotide chain