In the Hardy-Weinberg formula, what does p^2 represent?
A. Frequency of the dominant allele
B. Frequency of the recessive allele
C. Frequency of heterozygotes
D. Frequency of the homozygotes for one allele
Ans: D. Frequency of the homozygotes for one allele
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Which of the following statements is true regarding neurosecretory cells of the hypothalamus? Select all correct choices
A. They secrete releasing factors. B. They secrete thyroid-stimulating hormone (TSH). C. Their cell bodies reside in the hypothalamus. D. Their cell bodies reside in the (posterior) pituitary gland. E. They do not produce hormones, as they are neurons and not endocrine cells.
Which of the following is a possible reason why DNA uses thymine instead of uracil?
A. Thymine is more stable than uracil. B. Cytidine is deaminated to uracil so it would be difficult for any repair mechanism to differentiate between uracil that belongs in the sequence and uracil that resulted from deamination. C. Adenine is deaminated to uracil so it would be difficult for any repair mechanism to differentiate between uracil that belongs in the sequence and uracil that resulted from deamination. D. When uracil is bound to a deoxyribose it will become more reactive, forming covalent bonds with other bases. E. None of these choicesis correct.
According to the current model, which of the following is the correct sequence of microtubule assembly?
A) dimers, oligomers, sheets of protofilaments, protofilaments, closing of microtubule, elongating microtubule B) dimers, sheets of protofilaments, closing of microtubule, oligomers, protofilaments, elongating microtubule C) dimers, oligomers, protofilaments, sheets of protofilaments, closing of microtubule, elongating microtubule D) protofilaments, sheets of protofilaments, closing of microtubule, elongating microtubule, dimers, oligomers E) dimers, oligomers, protofilaments, elongating microtubule, sheets of protofilaments, closing of microtubule
Which of the following results in characteristic of mycoplasma spp. colony culture?
A. Alpha-hemolysis on blood agar B. Beta-Hemolysis on blood agar C. Double zone of hydrolysis on egg-yolk lecithin D. Fried egg colonies on agar E. Growth on chocolate agar