Figure 15.1 shows the three alleles for the beta-globin gene. Which of the following statements best describes the effect of having the S allele, which codes for sickle-cell anemia?
A. Having the allele is always harmful.
B. Having the allele is always beneficial.
C. The effect depends on whether the allele
occurs in its homozygous or heterozygous
form.
D. The effect depends on the environment
(i.e., whether malaria is present).
E. The effect depends on whether the allele
occurs in its homozygous or heterozygous
form, and the environment (i.e., whether
malaria is present).
E
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Using the figure below, identify the labeled part.
1) Label A: ______________________________
2) Label B: ______________________________
3) Label C: ______________________________
4) Label D: ______________________________
5) Label E: ______________________________
6) Label F: ______________________________
7) Label G: ______________________________
8) Label H: ______________________________
9) Label I: ______________________________
10) Label J: ______________________________
11) Label K: ______________________________
12) Label L: ______________________________
13) Label M: ______________________________
14) Label N: ______________________________
15) Label O: ______________________________
16) Label P: ______________________________
17) Label Q: ______________________________
18) Label R: ______________________________
19) Label S: ______________________________
The aging of a plant is
a. senescence. b. vernalization. c. abscission. d. dormancy. e. chlorosis.
Which of the following chemicals acts as a mordant in the Gram stain procedure?
A) Crystal violet B) Iodine C) Ethyl alcohol D) Safranin
Opportunistic infections resulting from AIDS do NOT include
A. bacterial pneumonia B. mycobacterial infections C. toxoplasmosis D. Kaposi's sacoma E. Strokes