Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope 32P. After a 48-hour incubation, the 32P would most likely be found in the S. cerevisiae's
a. Plasma membrane.
b. Cell wall.
c. Water.
d. Proteins.
e. Carbohydrates.
Ans: a. Plasma membrane.
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The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called
A. Mendelian inheritance. B. epistasis. C. genomic imprinting. D. linkage. E. dominance.
In rats, gene B produces black coat color if the genotype is B-, but black pigment is not produced if the genotype is bb. At an independent locus, gene D produces yellow pigment if the genotype is D-, but no pigment is produced when the genotype is dd. Production of both pigments results in brown coat color. If neither pigment is produced, coat color is cream. The genotype of parents of litters with the following phenotype distribution 3 brown, 3 yellow, 1 black, 1 cream is:
a. BBDD x bbdd b. BbDd x bbDd c. BBdd x bbdd d. BbDd x bbdd
Buffers ________.
a) will only lower the pH b) will only increase the pH c) are strong acids or bases d) help keep the pH within normal limits
Which of the following statements would Darwin have disagreed with?
A) Species change over time. B) Living species have arisen from earlier life-forms. C) Descent with modification occurs through inheritance of acquired characteristics. D) Descent with modification occurs by natural selection.