In the figure above, each new line represents the frequency of a new beneficial muta-tion. The figure describes the process of:
a. selective sweeps.
b. periodic selection.
c. genetic hitchhiking.
d. background selection.
e. A and B.
E
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Four nucleic acid samples are analyzed to determine the percentages of the nucleotides they contain. Which of the following DNA sample(s) could be double-stranded DNA?
Sample 1: A(22%), G(28%), T(22%), U(0%), C(28%); Sample 2: A(30%), G(30%), T(0%), U(20%), C(20%); Sample 3: A(18%), G(32%), T(0%), U(18%), C(32%); Sample 4: A(29%), G(29%), T(21%), U(0%), C(21%) a. Sample 1 b. Samples 1 and 2 c. Samples 1 and 4 d. Samples 2 and 3 e. Samples 3 and 4
Body mass index (BMI) is an indirect measurement of ____
a. caloric intake b. energy utilization c. basal metabolic weight d. age e. body fat
Which one of the following statements about transport of nutrients in phloem is correct?
A) Solute particles are actively transported from phloem at the source. B) Companion cells control the rate and direction of movement of phloem sap. C) Differences in osmotic concentration at the source and sink cause a hydrostatic pressure gradient to be formed. D) A sink is the part of a plant where a particular solute is produced.
Proteins on the surface of phagocytes called ________ aid in the detection of pathogen molecules
A) lectins B) TLRs C) NOD proteins D) lectins and C3 protein E) both TLRs and NOD proteins