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
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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.
The tube feet of sea stars are used primarily for
a. excretion of excess water. b. locomotion. c. reproduction. d. circulation. e. sensation
Which enzyme is active in DNA replication?
A) DNA polymerase B) RNA polymerase C) reverse transcriptase D) aminoacyl-tRNA synthetase E) RNase
What type of skeleton is found in annelids?
A) dermal skeleton B) endoskeleton C) exoskeleton D) notochords E) hydrostatic skeleton