Each DNA strand has a "backbone" that consists of alternating
a. amino acid units.
b. nitrogen-containing bases.
c. hydrogen bonds.
d. sugar and phosphate units.
e. amines and purines.
D
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In a one D process, how many D values would it take to reduce a population of 1010 cells to one survivor?
A. 2 B. 4 C. 5 D. 10
Ocean currents flow in response to ____; their
direction is an outcome of the earth's rotation and ____, causing a ____ rotation in the Northern Hemisphere and a ____ rotation in the Southern Hemisphere. a. gravity; topography; counterclockwise; clockwise b. topography; gravity; clockwise; counterclockwise c. temperature; topography; clockwise; counterclockwise d. gravity; topography; clockwise; counterclockwise e. winds; gravity; clockwise; counterclockwise
The F2 phenotypic ratio of 9:3:4 is a result of a cross
involving a. two genes expressing complete dominance. b. a gene expressing dominance and another gene expressing codominance. c. two genes expressing codominance. d. epistasis, in which one gene modifies the expression of the other gene. e. multiple alleles.
A trait shows ____ if the phenotype of that trait is present in less than 100% of those with the related genotype
a. autosomal recessive inheritance b. autosomal dominant inheritance c. incomplete dominance d. incomplete penetrance e. incomplete expressivity