The embryonic precursor to the human spinal cord is the _____
A) notochord
B) neural tube
C) mesoderm
D) archenteron
E) set of bilateral somites
Answer: B
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The ribosome binding site in an mRNA transcript is located ____ and is where ____
a. at the start codon; the large ribosomal subunit binds to the mRNA-tRNA complex in prokaryotes b. just upstream of the start codon; the large ribosomal subunit binds to mRNA in eukaryotes c. at the start codon; the small ribosomal subunit binds to the mRNA-tRNA complex in eukaryotes d. on aminoacyl-tRNA; the large ribosomal subunit binds to tRNA in prokaryotes e. just upstream of the start codon; the small ribosomal subunit binds to mRNA in prokaryotes
The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing at an exponential rate, is the ________.
A. stationary phase B. lag phase C. exponential phase D. prophase E. death phase
Which sequences of eukaryotic genes code for proteins?
A) exons B) introns C) invariant D) the spliceosome
RT-PCR (reverse transcription-polymerase chain reaction) can be used to compare gene expression levels during an organism's response to the environment. A scientist monitoring a tetracycline resistance gene will see what response in the expression when
the organism is challenged? A) no change in gene expression B) decreased gene expression C) increased gene expression