Transpiration water loss occurs mostly through which of the following structures?
A. epidermal cells
B. guard cells
C. vessels
D. pores
E. stomata
Answer: E
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In contrast to a eukaryotic chromosome, a prokaryotic chromosome
(a) is shorter and fatter (b) has a single loop of DNA (c) never replicates (d) contains many histones (e) all of these are correct
Fungi are similar to plants because both
A) produce embryos when they reproduce. B) liberate nutrients from dead tissues. C) have chloroplasts in their cells. D) have cell walls surrounding their plasma membranes. E) are important producers in their ecosystems.
How is the splicing of U2-dependent introns different from that of U12-dependent introns?
a. U12-dependent introns have no branch site. b. U2-dependent introns have longer consensus sequences at the splice sites. c. Most of the snRNPs in the spliceosomes are different. d. The SR proteins in the spliceosomes are different. e. U12-dependent introns are self-splicing.
Mutations that affect SR proteins will have what kind of effect on gene expression?
A) Polyadenylation at the 3' end will be blocked. B) Ribosomes will not be able to bind to mRNA molecules in the cytoplasm. C) General transcription factors will be unable to bind to promoters. D) RNA polymerase will be unable to terminate transcription. E) Splicing of the mRNA will not be activated.