Which types of mutations are least likely to be subjected to natural selection?

A. Silent
B. Missense
C. Nonsense

D. Insertion


A

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

Of the following, which one is not found in procaryotic cells?

A) cell membrane B) chromosome C) mitochondria D) plasmids

Biology & Microbiology