In addition to controlling states of arousal, the reticular formation also ____
a. controls postural muscle activity
b. regulates blood pressure and respiratory activity
c. releases hormones that aid in sleep
d. controls visual inputs
e. controls language and speech patterns
ANSWER: a
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Zhang and Cech’s experiments confirmed which feature of ribozyme activity?
a. Ribozymes inhibit rates of biological reactions. b. Ribozymes catalyze formation of bonds between amino acids in protein synthesis. c. Ribozymes catalyze formation of the fundamental linkage tying nucleic acids to proteins. d. Ribozymes can link nucleic acids together even if their proteins are removed. e. Ribozymes provide a possible solution to the question of whether proteins or nucleic acids appeared first in evolution.
Which of the following is an inherited disorder in which skeletal muscle fibers break down?
a. sclerosis b. dystrophy c. atrophy d. sarcoma e. tetanus
To bypass the pulmonary circulation in the fetal heart, much of the blood entering the right atrium is shunted directly to the left atrium through the
A. foramen ovale. B. vernix caseosa. C. fontanel. D. umbilical cord.
The pollen grains of pine each consists of three cells
____________________ Indicate whether the statement is true or false.