Which are assemblages of abiotically produced polymers?
a. ribozymes
b. stromatolites
c. protobionts
d. endosymbionts
e. polyribosomes
c
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Which medication prevents viral infections by priming the immune system against a specific virus?
A. Anti-inflammatory medication B. Antibiotics C. Diuretics D. Vaccines
When sodium ions move from one cardiac muscle cell to an adjacent cell, causing them to contract in unison, this is an example of
A. endocrine signaling. B. paracrine signaling. C. contact-dependent signaling. D. direct intercellular signaling. E. autocrine signaling.
The production of estrogen and progesterone decreases during menopause. This can cause thinning of bones and brief moments of feeling hot. What is another biological effect of low amounts of these hormones in women?
A) inability to maintain normal nerve cell development B) inability to reproduce successfully C) becoming anemic D) joint swelling
Which of the following is not a good example of a housekeeping protein?
(a) DNA repair enzymes (b) histones (c) ATP synthase (d) hemoglobin