Which of the following is a bacterial infection that can cause the uterine tubes to be blocked by scar tissue?
A) Chlamydia
B) Genital herpes
C) HIV
D) Trichomoniasis
E) HPV
A
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What must be true of any organ described as vestigial?
A) It must be analogous to some feature in an ancestor. B) It must be homologous to some feature in an ancestor. C) It must be both homologous and analogous to some feature in an ancestor. D) It need be neither homologous nor analogous to some feature in an ancestor.
What would happen to the HS allele if a vaccine for malaria was 100% effective?
The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. . The HS allele would increase in frequency in populations where malaria was present. B. The HS allele would decrease in frequency in populations where malaria was present. C. There would be no change in frequency between the HS and HA allele. D. Negative frequency-dependent selection would occur and there would be a balanced frequency between the two alleles. E. The frequency of homozygous individuals would decrease and the heterozygous individuals would increase.
Prior to hibernation, bears seek food with what primary nutrient?
a. fat b. protein c. carbohydrate d. starch
During DNA replication, the enzyme DNA ________ opens up a short segment of the helix, exposing its nitrogenous bases.
Fill in the blank(s) with the appropriate word(s).