Removal of ____ turns genes off
a. enzymes
b. histones
c. esters
d. acetyl groups
d
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When will the fetal movement likely be most frequent and strong?
a. Between 12?24 weeks b. During the 7th or 8th months of pregnancy c. During the 2nd trimester d. During the 9th month of pregnancy
Approximately ____ of American children are obese
a. 1 in 4 b. 1 in 5 c. 1 in 6 d. 1 in 7
According to Bell and colleagues, which of the following is strongly related to the
development of homosexuality? a. High levels of testosterone b. Poor parent-child relationships c. A preponderance of same-gendered friends in childhood d. A specific genotype e. Gender nonconformity in childhood
Action potentials are produced by the
A) opening of voltage-activated sodium channels. B) closing of ligand-activated chloride channels. C) closing of ligand-activated potassium channels. D) opening of ligand-activated potassium channels. E) closing of voltage-activated calcium channels.