Which genes are responsible for your overall structure, such as how many legs you have and where they develop?
A. Homeotic genes
B. Growth factor genes
C. Proto-oncogenes
D. Oncogenes
Answer: A
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The human b-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. If a vaccine for malaria was created that was 100% effective, affordable, and widely available, what would happen to the frequency of the HS allele?
A. The HS allele would increase in regions where malaria is prevalent and decrease in regions where malaria is absent or rare. B. The HS allele would decrease in regions where malaria is prevalent and increase in regions where malaria is absent or rare. C. Due to balancing selection, the frequency of the HS allele would remain stable in all regions. D. The HS allele would increase in regions where malaria is prevalent and remain stable in regions where malaria is absent or rare. E. The HS allele would decrease in regions where malaria is prevalent and remain stable in regions where malaria is absent or rare.
Researchers have determined that the growth of hormone-responsive breast cancer cells depends upon ____
a. the relative concentrations of ER? and ER? in the tumor cells b. the ability of ER? to stimulate cancer cell growth c. the ability of ER? to inhibit cancer cell growth d. whether DNA binding sites exists for ER?, but not ER? e. the relative concentrations of estrogen and testosterone in breast tissue
Which of these would be an effective method of controlling yeast populations in a test sample?
a. constant stirring to break up biofilms b. percolating oxygen through the sample c. adding enzymes to inhibit mating factor d. adding antibiotics to the test sample
In animal cells the main microtubule organizing center (or centrosome) is important in cell division
__________________ Indicate whether the statement is true or false.