The above figure is a photomicrograph of what
kind of tissue?
a. cardiac muscle
b. skeletal muscle
c. nerve tissue
d. cartilage
e. dense connective
C
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Three factors that help return blood to the heart are ___________
Fill in the blank(s) with the appropriate word(s).
The CD4 molecule is
A) an HIV surface glycoprotein. B) a cell-surface protein receptor for HIV. C) found only on T-helper cells. D) an HIV surface glycoprotein that is found only on T-helper cells.
Mendel's dihybrid crosses, but not his monohybrid crosses, show that
a. some genes are linked together. b. the two alleles controlling a trait are divided equally among the gametes. c. alleles for different traits are inherited independently. d. one of the pair of alleles is dominant to the other. e. the crossing of two different homozygous forms will not produce any offspring in the first generation that will look like either of the parents.
The neurotransmitter acetylcholine is released by neurons at the neuroeffector synapse?
A. True only for the sympathetic division B. True only for the parasympathetic division C. True for both divisions