BIO 1404 Test 5 (CH. 15,16, and 21) Questions and Answers
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BIO 1404 5
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BIO 1404 5
BIO 1404 Test 5 (CH. 15,16, and 21)
The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this? - Answer-degeneracy
How many nucleotides are in 12 mRNA codons? - Answer-36
Which event contradicts the central dogma of molecular biology? - Answer-S...
BIO 1404 Test 5 (CH. 15,16, and 21)
The AUC and AUA codons in mRNA both specify isoleucine. What feature of the
genetic code explains this? - Answer-degeneracy
How many nucleotides are in 12 mRNA codons? - Answer-36
Which event contradicts the central dogma of molecular biology? - Answer-Scientists
use reverse transcriptase enzymes to make DNA from RNA.
Which subunit of the E. coli polymerase confers specificity to transcription? -
Answer-σ
The -10 and -35 regions of prokaryotic promoters are called consensus sequences
because ________. - Answer-they are similar in all bacterial species
Which feature of promoters can be found in both prokaryotes and eukaryotes? -
Answer-TATA box
What transcripts will be most affected by low levels of α-amanitin? - Answer-pre-
mRNAs
How do enhancers and promoters differ? - Answer-Enhancers increase the
efficiency of gene expression, but are not essential for transcription. Promoter
recognition is essential to transcription initiation.
Which pre-mRNA processing step is important for initiating translation? - Answer-7-
methylguanosine cap
What processing step enhances the stability of pre-tRNAs and pre-rRNAs? -
Answer-methylation
The RNA components of ribosomes are synthesized in the ________. - Answer-
nucleolus
In any given species, there are at least how many types of aminoacyl tRNA
synthetases? - Answer-20
A scientist introduces a mutation that makes the 60S ribosomal subunit
nonfunctional in a human cell line. What would be the predicted effect on translation?
- Answer-Translation stalls after the initiation AUG codon is identified.
Control of gene expression in eukaryotic cells occurs at which level(s)? - Answer-
epigenetic, transcriptional, post-transcriptional, translational, and post-translational
levels
Post-translational control refers to: - Answer-regulation of gene expression after
translation
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