Which of the following is considered normal for systolic pressure?
a. 90
b. 120
c. 140
d. 80
B
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The protein chains in a complete antibody molecule are connected to each other by ________ bonds.
A. ionic B. disulfide C. peptide D. None of the choices are correct.
When solutes are unloaded from phloem, water
a. is pumped into the phloem by active transport. b. leaves the xylem by osmosis. c. moves into the phloem by facilitated diffusion. d. is pumped out of the phloem by active transport. e. leaves the phloem by osmosis.
In humans, normal skin pigmentation is influenced by a dominant gene (C), which allows pigmentation to develop
All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin formation and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances that the next child will be an albino? What will be an ideal response?
A lac repressor turns off the expression of the lac genes by
a. Binding to the promoter b. DNA polymerase c. Binding to the operator d. Binding to the lac genes