Which statement is false?
a. Calcium is the most important mineral involved with bone tissue turnover.
b. Osteoblasts and osteoclasts are involved with the reabsorption and repair of bones.
c. Bone mass decreases with age.
d. Males have greater problems with loss of bone tissue than females do.
e. Marrow fills the cavities in the spaces of the spongy bone and in the center of the shaft of
the bone almost as quickly as the spaces are formed.
D
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Shiga toxin is dangerous to humans because it is an _____
a. endotoxin that kills cells b. endotoxin that illicit an immune response c. exotoxin that interferes with protein synthesis by intestinal cells d. exotoxin that disrupts nerve cell function e. exotoxin that can overwhelm the immune response and decrease blood pressure
Which of the following is true regarding current scientific thought?
a. DNA originated before RNA. b. RNA originated before DNA. c. RNA and DNA originated at the same time. d. RNA and DNA are the same thing.
A single pass trans-membrane protein that is an alpha helix can make a channel.
a. true b. false
Which of the following is a MAJOR trade-off in life histories?
a. number of reproductive events for number of offspring per reproductive event b. growth for reproduction c. size of offspring for number of reproductive events