A short base sequence near the poly-A tail of a mature mRNA functions to ________
a. encode a destination for the molecule and block translation before it is delivered
b. aid binding of the mRNA by the small ribosomal subunit
c. bind to complementary regions on microRNAs, signaling degradation of the message
d. delay the degradation of the coding region by exonucleases
a
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ABC-type ATPases that inhibit the effectiveness of antitumor drugs by transporting the drugs out of tumor cells are known as
A) multidrug resistance (MDR) transporters. B) Na+-drug antiporters. C) the cystic fibrosis transmembrane conductance regulator (CFTR). D) porins. E) None of the above; no such transporter has been identified in eukaryotes.
If a chromosome lacks certain genes, what has most likely occurred?
A) disjunction B) an inversion C) a deletion D) a translocation E) a nonduplication
In addition to underground roots, cycads produce about ground corraloid roots that resemble branching coral. These roots harbor
a. weevils b. green algae c. ovules d. cyanobacteria e. endophytic fungi
Primary and secondary antibody response differ in all the following ways, except
A. the lag period between antigen stimulation and antibody response is shorter in the secondary response. B. IgG production predominates in secondary responses. C. primary responses are active whereas secondary responses are passive. D. the rate of antibody production is faster in primary responses than in secondary responses.