Endospores form
a. when the environmental conditions are favorable.
b. during binary fission.
c. as a means of genetic recombination.
d. in response to adverse conditions.
e. to produce two offspring from every one parental cell.
D
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The reading frame for translation is established by ____
a. removal of the cap from mRNA b. pairing of initiator tRNA with the start codon c. the first base in the mRNA molecule d. the ribosome binding site e. the poly(A) tail
In plants, sporophytes undergo meiosis to produce spores.
A. diploid B. fertilized C. triploid D. haploid E. tetraploid
The type of reproductive barrier that occurs when two species mate but produce sterile hybrids is referred to as ________
A) mechanical isolation B) temporal isolation C) a postzygotic barrier D) a prezygotic barrier
Which structure is common to both prokaryotic and eukaryotic cells?
A) Nucleus B) Ribosomes C) Chloroplasts D) Mitochondria