By the end of the first trimester of pregnancy, all of the major ____________________ have formed and are
functional. Fill in the blank(s) with the appropriate word(s).
organ systems
organs
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Assume that in guinea pigs, dark brown fur (B) is dominant to black fur (b). If you mate a homozygous black guinea pig with a heterozygous brown guinea pig, what proportion of the progeny will be black?
A) none B) 1/4 C) 1/2 D) 3/4 E) all
An RNA molecule is typically _____ ; a DNA molecule is typically _____
a. single-stranded; double-stranded b. double-stranded; single-stranded c. both are single-stranded d. both are double-stranded
Eating sashimi (uncooked fish) is a risk factor for infection with
A) Entamoeba histolytica. B) Taenia saginata. C) Giardia intestinalis. D) Enterobius vermicularis. E) Anisakis simplex.
What process best characterizes Ca2+ movement from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration)?
A. Calcium movement occurs by passive diffusion. B. Calcium movement is spontaneous. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement involves active transport. E. Calcium movement does not require energy.