A positive-strand RNA virus:
A) must first be converted to a mRNA before it can be translated.
B) can be used directly to translate viral proteins.
C) will be degraded by host enzymes.
D) is not recognized by host ribosomes.
Ans: B) can be used directly to translate viral proteins.
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Plants have adapted to dry land by evolving all of the following except association with mycorrhizae to improve mineral uptake
a. secreting a waxy coating to prevent water loss. b. forms of chlorophyll more efficient at capturing light. c. tissues to conduct water through the plant. d. structures to protect reproductive cells and embryos.
Proto-cells are considered to have
a. been simple membrane-bound sacs. b. been able to capture energy. c. been able to engage in metabolism. d. been able to reproduce. e. all of these.
The pressure-flow hypothesis describes
A. how carbohydrates in solution move through the phloem. B. how carbohydrates and minerals move through the xylem. C. how hormones move through the phloem. D. how carbohydrates enter the sieve tubes. E. how water and minerals move through the xylem.
Discuss how environmental factors can have a negative impact on the development of a fetus. What will be an ideal response?