Which of the following is NOT one of the signs of aging in the skin?

a. increased collagen
b. reduced fibroblasts
c. increase in sweat glands
d. less pigmentation in hair
e. increased fat deposits


ANSWER: c

Biology & Microbiology

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Which of the following describes reinforcement of reproductive isolation?

A. The physical separation of two populations with diverging characteristics B. The reduced fitness of hybrid offspring C. The ability to identify and preferentially mate with only members of the same population D. An outbreak of disease that wipes out one of the two populations that would otherwise mate and form hybrid offspring

Biology & Microbiology

Plasmids CANNOT ____

a. self-replicate b. be transferred between bacteria. c. encode proteins. d. be produced by eukaryotes. e. carry genes separate from the bacterial chromosome.

Biology & Microbiology

________ are large areas that have similar environmental conditions and characteristic plant communities

A) Ecosystems B) Biomes C) Biospheres D) Climax communities E) Climatic zones

Biology & Microbiology

Which description(s) correspond to class Prokaryote in order to test your understanding of the characteristics of prokaryotes, eukaryotes, and viruses.

> Must be viewed with an electron microscope > Acellular particle > Size range: 10-200nm > Cell type that lacks a nucleus > Contains a nucleus and other membrane-bound organelles > Size range: 1-10?m

Biology & Microbiology