Ribozymes are
A. catalysts for DNA splicing.
B. ribosomes which catalyze reactions.
C. catalysts for RNA editing.
D. unique to prokaryotes.
E. unique to eukaryotes.
Answer: C
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Recombination at the synaptonemal complex always results in ____
a. two changed and two unchanged chromatids b. four unchanged chromatids c. four changed chromatids d. a random number of changed vs. unchanged chromatids e. one unchanged and three changed chromatids
In the modification of eukaryotic mRNA, ________ cap and ________ tail are usually added to the transcript.
A) an acetylated-guanine; a poly-cytosine B) a poly-guanine; a methyl group C) a poly-thymine; an acetyl group D) a methylated-guanine; a poly-adenine E) a methylated-adenine; a poly-guanine
ADH increases fluid retention when the body sweats and decreases fluid retention when someone has consumed large amounts of water. This is an example of
A) positive feedback. B) negative feedback. C) neurotransmitter activity. D) paracrine communication. E) synaptic communication.
In a human female, what happens to the collection of oocytes in the ovaries once puberty begins?
A) One oocyte per month matures and completes meiosis I. B) All ooctyes are expelled from the ovaries to complete meiosis II. C) Ovulation stimulates all of the oocytes to complete meiosis II. D) One oocyte per month matures and completes meiosis I and meiosis II. E) The oocytes all mature into eggs as soon as puberty is reached.