A single, weak contraction of a muscle fiber is called ____
a. an action potential
b. a muscle twitch
c. fatigue
d. tetanus
e. constriction
ANSWER: b
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Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain becomes nonlethal. Type R Streptococcous pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The S strain would be transformed into the nonvirulent R strain and kill the host. B. The R strain would be transformed into the virulent S strain and kill the host. C. The S strain would be transformed into the nonvirulent R strain and not affect the host. D. The R strain would be transformed into the virulent S strain and not affect the host. E. Neither the S nor the R strain would change.
Oxygen moves from alveoli to the bloodstream ____
a. because the concentration of oxygen is greater in alveoli than in the blood b. mainly due to the activity of carbonic anhydrase in the red blood cells c. against a concentration gradient d. to equal the concentration of CO2 in the blood e. by active transport
The primary transcript that results from transcription must be modified in eukaryotes before it can be translated into a functional protein
The nucleotide sequence pieces that ultimately form the resulting mRNA and contain the genetic information are called ________. Fill in the blank(s) with correct word
Eukaryotic cells spend most of their cell cycle in which phase?
A) interphase B) prophase C) metaphase D) telophase