The components of a nucleoside are:
a. a nitrogenous base
b. a nitrogenous base and a pentose sugar
c. a nitrogenous base, a pentose sugar, and a phosphate group
d. a nucleotide and a phosphate group
e. Both c and d
Ans: b
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A patient with a thyroid tumor has her thyroid gland removed. Without a thyroid gland and without synthroid (a thyroid hormone replacement drug), which of the following is most likely to occur?
A. Her blood TSH (thyroid stimulating hormone) levels will be abnormally high and her energy level will be low. B. Her blood TSH levels will be abnormally high and her metabolic rate will be high. C. Her blood TSH levels will be abnormally low and her energy level will be low. D. Her blood TSH levels will be abnormally low and her metabolic rate will be high. E. Her blood TSH levels will be abnormally high but metabolic rate will be low.
Which molecule in the Krebs cycle acts as a substrate of the first reaction and is a product of the last reaction?
1.pyruvate 2.acetyl-coenzyme A 3.citrate 4.oxaloacetate
Histamine
a. causes blood vessels to contract. b. causes capillaries to lose their permeability. c. causes an outward flow of fluids from the capillaries. d. reduces tissue swelling. e. enhances the function of cytokines.
If there is only random mating in a population and no other selection pressures acting on the population, the expected outcome will be that _________
a) allelic frequencies will remain the same but the genotype distribution will change. b) genotypic frequencies will remain the same but the allelic frequencies will change. c) both the genotypic and allelic frequencies will change. d) both the genotypic and allelic frequencies will stay the same. e) No prediction about genotypic and allelic frequencies can be made from one generation to the next