Traditional evolutionary systematics used the Linnaean system of classification
a. True
b. False
ANSWER: True
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In almost all organisms that have been studied, the genes in Hox clusters:
A. are arranged on chromosomes in the same order as their products function along the anterior-posterior segments of the embryo. B. are expressed in a sequence that is independent of their linear organization along the chromosome. C. each contain a unique homeodomain, the the products of which are very different among organisms. D. are arranged on the chromosomes in a sequence that is independent of the order in which their products function along the anterior-posterior axis of the embryo. E. None of these choices are correct.
The area of skin supplied by sensory nerve fibers from a particular dorsal root is called a
A) somite. B) microtome. C) dermatome. D) sensory unit.
Which is not true of the cell cycle?
(a) the cell cycle is controlled by internal/external signals (b) Cyclin is a signaling molecule that increases and decreases as the cycle continues (c) DNA damage can stop the cell cycle at the G1 checkpoint (d) Apoptosis occurs frequently during the cell cycle
Which of the following is a source of vitamin K for humans?
A) Bacteroides thetaiotetraiotamicron digests foods, which release vitamin K. B) Escherichia coli in their digestive tract produces vitamin K. C) S. epidermidis releases vitamin K from dead cells. D) their diet only