The structural level of a protein that is LEAST affected by a disruption in hydrogen bonding is the
A. primary level
B. tertiary level
C. quaternary level
D. secondary level
Ans: A. primary level
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Plants have an intermediate body form called a sporophyte that undergoes meiosis. The cells produced grow, through mitosis, into another intermediate body form called a gametophyte, which divides by mitosis to form gametes. The gametes fertilize, and the zygote grows, through mitosis, into another sporophyte. This form of a sexual life cycle is referred to as
A. alternation of generations. B. crossing-over. C. polyploidy. D. an asexual life cycle. E. germination.
The sieve plate, stone canal, circular canal, and radial canals of a sea star are structures of the
a. nervous system. b. water-vascular system. c. digestive system. d. excretory system.
Select the choices that are ways that the hypothalamus controls the activity of the anterior pituitary.
a. neurons of the hypothalamus b. releasing hormones of the hypothalamus c. inhibiting hormones of the hypothalamus
Transposable elements have been found only in bacteria and do not appear to play a major role in eukaryotes.
Answer the following statement true (T) or false (F)