In plants:
a. The diploid zygote develops into the sporophyte
b. The haploid zygote develops into the sporophyte
c. The haploid gametophyte develops into the sporophyte
d. The diploid zygote develops into the gametophyte
e. The haploid gametophyte produces gametes by meiosis
Answer: a. The diploid zygote develops into the sporophyte
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Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?
A) Cilia and flagella arise from centrioles. B) Loss of basal bodies should prevent cells from dividing in two. C) Motor proteins such as dynein must have evolved before any of these four kinds of structure. D) Cilia and flagella evolved separately in the same ancestral eukaryotic organism. E) Natural selection for cell motility repeatedly selected for microtubular arrays in circular patterns in the evolution of each of these structures.
If the DNA sequence was substantially altered from one of the following, which would prevent the binding of the TATA-binding protein (TBP)?
A) RNA polymerase B) the point where transcription begins C) the promoter D) promoter-proximal elements E) histone acetyl transferases (HATS)
To convert a nucleoside into a nucleotide, what moiety must be added?
A. One or more pyrimidine bases B. One or more phosphate groups C. One or more double bonds D. One or more purine bases
An ? helix is formed by hydrogen bonds between:
A. nonpolar and polar R groups. B. positively charged and negatively charged R groups. C. the carbonyl oxygen and the amide nitrogen of alternate amino acids. D. the carbonyl oxygen and the amide nitrogen of every third amino acid. E. the carbonyl oxygen and the amide nitrogen of every fourth amino acid.