When a eukaryotic mRNA is hybridized to the complementary DNA, loops of un-hybridized DNA are seen. These loops ____________.
A. correspond to noncoding regions of the gene
B. demonstrate that genes and proteins are not colinear.
C. represent introns that are removed
D. All of the above. corre...
When a eukaryotic mRNA is hybridized to the complementary DNA, loops of un-hybridized DNA are
seen. These loops ____________.
A. correspond to noncoding regions of the gene
B. demonstrate that genes and proteins are not colinear.
C. represent introns that are removed
D. All of the above. correct answersD. All of the above.
What is the most likely result from mutating a prokaryotic Shine-Dalgarno sequence?
A. The first amino acid of the translated protein would be changed.
B. The mRNA would be less stable.
C. The ribosome would not be able to bind to the mRNA.
D. None of the above. Prokaryotes do not have a Shine-Dalgarno sequence. correct answersC. The
ribosome would not be able to bind to the mRNA.
Which is NOT true of ribosomes?
A. They are one of the most abundant molecular complexes of both eukaryotic and prokaryotic cells.
B. They are made up entirely of ribosomal RNA molecules.
C. They contain a small subunit and a large subunit.
D. RNAs undergo extensive processing before assembly into the ribosome. correct answersB. They are
made up entirely of ribosomal RNA molecules.
Any given DNA sequence has _____ possible reading frames, and the correct one is set by a(n)
______________.
A. 2; termination codon
B. 4; initiation codon
C. 3; initiation codon
D. 3; termination codon
, E. 2; initiation codon correct answersC. 3; initiation codon
What is the final component of the initiation complex to be added?
A. large subunit of the ribosome
B. small subunit of the ribosome
C.tmRNA
D. initiator tRNA
E. GTP correct answersA. large subunit of the ribosome
Which of the following is NOT a correct description of how translation differs between bacteria and
eukaryotic cells?
A. In bacterial cells, transcription and translation can occur simultaneously, whereas in eukaryotic cells
these processes occur in different cellular locations.
B. In prokaryotes, the small ribosomal subunit associates with the mRNA at the Shine-Dalgarno
sequence, whereas in eukaryotes the small ribosomal subunit first associates with the 5' cap of the
mRNA.
C. In prokaryotes the initiator codon is recognized by met-tRNA, whereas in eukaryotes the initiator
codon is recognized by fmet-tRNA.
D. Eukaryotic ribosomes are larger and have an additional rRNA that bacterial ribosomes lack. correct
answersC. In prokaryotes the initiator codon is recognized by met-tRNA, whereas in eukaryotes the
initiator codon is recognized by fmet-tRNA.
The kind of gene whose product interacts with other nucleotide sequences to affect their transcription
or translation is a ______.
A. constitutive gene
B. regulatory gene
C. structural gene
D. protein-coding gene correct answersB. regulatory gene
A typical operon contains several regions. In which region does a regulator protein bind?
A. structural genes
B. promoter
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