Assume that an mRNA molecule beginning with an AUG is made that is complementary to this DNAsequence:3
'?CTTACATGGCATCC?5'
See the genetic code table above. The second codon (counting the start codon as the first codon)
directs incorporation of which amino acid in the polypeptide?
a. asparagine
b. tyrosine
c. arginine
d. proline
e. cysteine
B
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What is the difference between sister chromatids before and after anaphase II?
a. Before anaphase II, the sister chromatids are separate; after anaphase II, the sister chromatids join and form a chromosome. b. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, each sister chromatid is an individual chromosome. c. Before anaphase II, each sister chromatid is an individual chromosome; after anaphase II, the sister chromatids form a single chromosome. d. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, the sister chromatids become homologous chromosomes. e. There is no difference; they are still together as a single chromosome.
Many fern gametophytes are hermaphrodytes, meaning they can produce both sperm and egg. Why is this necessary for a fern, but not for an angiosperm?
a. If a seed colonized a new habitat alone, it could still reproduce b. The gametophyte could produce multiple types of spores c. The gametophyte could produce multiple types of seeds d. If a spore colonized a new habitat alone, it could still reproduce e. Angiosperm gametes are already diploid
Peracetic acid is a liquid chemical sporicide that is a type of
a) peroxygen. b) biguanide. c) aldehyde. d) halogen.
Which one of the following diseases is caused by the reactivation of a latent virus?
a) Smallpox b) Shingles c) Rubella d) Roseola