In vertebrates, the central nervous system develops directly from the ____
a. somites
b. neural plate
c. notochord
d. cells of the neural crest
e. neural tube
ANSWER: e
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The main reason that mRNA transcripts are modified at the 5' and 3' ends is:
A. to ensure that all nucleotides are phosphorylated. B. to protect the RNA from nucleolytic degradation. C. so that the two ends remain associated with each otherduring transport. D. to guide the removal of introns.
A phenomenon known as ________ [two words] occurs under conditions where a selection pressure works against deleterious mutations, resulting in the corresponding decrease in the frequency of a closely linked neutral mutation
Fill in the blank(s) with correct word
Embryonic stem cells cannot develop into __________ cells
a. muscle b. nerve c. blood d. placental e. other stem
Group A streptococci produce ________ which breaks down blood clots, allowing the bacteria to spread
A) M proteins B) a hyaluronic acid capsule C) C5a peptidase D) streptokinase E) pyrogenic toxins