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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Which sequences of eukaryotic genes code for proteins?

A) exons B) introns C) invariant D) the spliceosome

Biology & Microbiology

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

Biology & Microbiology