Which of the following is not a strategy that bacteria use to resist the action of antibiotics?
A. Altering cell membrane structure to prevent antibiotic influx.
B. Cleavage of a key structural component of the antibiotic.
C. Modification of the antibiotic by the acetylation or phosphorylation.
D. All of the choices are correct.
Answer: D
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Which sequence reflects the locations that a secretory protein will visit on its way from its production to its secretion outside the cell?
A) rough ER, secretory vesicle, Golgi complex, ER vesicle B) rough ER, Golgi complex, smooth ER, ER vesicle C) nucleus, Golgi complex, rough or smooth ER, secretory vesicle D) smooth ER, rough ER, Golgi complex, secretory vesicle E) rough ER, ER vesicle, Golgi complex, secretory vesicle
Insertion or deletion of a nucleotide in a gene causes a type of mutation called a(n) ____________________ mutation
Fill in the blank(s) with correct word
Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,
a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called
a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.
Which of the following led to the development of the cell theory?
A) scientific laws B) microscopic observations C) educated guesses D) controlled experiments