Species that determine the structure of communities are called

a. climax.
b. keystone.
c. transitional.
d. crucial.
e. pioneer.


B

Biology & Microbiology

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Which of the following is a characteristic of Nanos protein?

A. Throughout the first seven nuclear divisions, Nanos concentration is higher in the anterior pole than in the posterior pole. B. Nanos represses Hunchback in the posterior pole. C. Nanos is a transcriptional activator of many segmentation genes. D. Nanos represses Caudal in the anterior pole.

Biology & Microbiology

Density-independent factors that limit population

growth include a. parasites. b. temperature. c. disease. d. competition. e. predation.

Biology & Microbiology

Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?

A) Via mitosis B) Via meiosis C) Via binary fission D) Via endosymbiosis

Biology & Microbiology

The size of a population depends on its rates of births, deaths, __________, and __________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology