The expression of which of the following contributes to development of cancer?
A) tumor suppressor genes
B) oncogenes
C) proto-oncogenes
D) apoptosis genes
E) the p53 gene
Answer: B
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What is the route of water in the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
The structures indicated by the arrows in Figure 4-3 are:a
intermembrane space. b. grana. c. cristae. d. matrices. e. plastids.
Meiotic cell division in animals occurs in the ________ and results in the production of ________
A) testes and ovaries; gametes B) testes and ovaries; diploid cells C) body cells; parent cells D) body cells; daughter cells
What level of taxonomy is Eukarya?
What will be an ideal response?