An axenic environment is one

A) in which microorganisms remain with the person throughout life.
B) that is free of microbes.
C) that is a source of contamination.
D) in which microorganisms remain present only for a short time.
E) contaminated by microbial toxins.


B

Biology & Microbiology

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Heritability refers to

A) the genetic contribution to a phenotype in a population at a particular time. B) the genetic contribution to the variability of a phenotype in a population at a particular time. C) the number of genes contributing to a trait in a population. D) the degree to which offspring resemble parents.

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The tube feet of sea stars are used primarily for

a. excretion of excess water. b. locomotion. c. reproduction. d. circulation. e. sensation

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Which enzyme is active in DNA replication?

A) DNA polymerase B) RNA polymerase C) reverse transcriptase D) aminoacyl-tRNA synthetase E) RNase

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What type of skeleton is found in annelids?

A) dermal skeleton B) endoskeleton C) exoskeleton D) notochords E) hydrostatic skeleton

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