Which types of mutations are least likely to be subjected to natural selection?
A. Silent
B. Missense
C. Nonsense
D. Insertion
A
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Of the following, which one is not found in procaryotic cells?
A) cell membrane B) chromosome C) mitochondria D) plasmids
If a mutation prevented the formation of lignin, what tissue would be most affected?
a. vascular cambium b. collenchyma c. phloem d. sclerenchyma e. parenchyma
The geologic time scale is subdivided on the
basis of a. the appearance of different radioactive isotopes in different strata. b. levels of background extinction. c. periods of mass extinction. d. the appearance of different radioactive isotopes in different strata and levels of background extinction. e. the appearance of different radioactive isotopes in different strata, levels of background extinction, and periods of mass extinction.
Which of the following does not describe a situation of asexual reproduction?
(a) A bacterium multiplying by simple cell division. (b) Using a part of a plant to create a new independent plant. (c) Using in vitro fertilization to combine a sperm and an egg to create an embryo. (d) The parthenogenetic development of eggs produced by some species of lizards.