Barr bodies are associated with ________
A) signal transduction
B) X chromosome inactivation
C) frameshift mutations
D) proto-oncogenes
B
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Sex differences in body growth are mediated by changes in growth hormone, insulin-like growth factor I and
A. thyroid hormone. B. estradiol and testosterone. C. prolactin. D. progesterone. E. cortisol.
ATP acts as what type of agent in almost all metabolic pathways?
a. energy transfer b. feedback c. catalytic d. synthetic e. enzymatic
Specific cells of diploid sporophytes undergo meiosis to produce
A) haploid, single-celled spores. B) haploid, single-celled gametes. C) diploid, multicellular spores. D) a diploid, single-celled zygote. E) diploid, multicellular gametes.
All of the following are true regarding NK cells EXCEPT
A) they are a type of lymphocyte. B) they are found in tissues of the lymphatic system. C) they have the ability to kill infected body cells and some tumor cells. D) they destroy infected body cells by phagocytosis. E) they release toxic substances that cause cell lysis or apoptosis.