A secondary lateral meristem which consists of a ring of dividing cells that produce secondary xylem to its interior and secondary phloem to its exterior is known as
a. cork cambium
b. wood
c. vascular cambium
d. stem apical meristem
e. root apical meristem
Ans: c. vascular cambium
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a. 0.5 b. 1.5 c. 5 d. 10 e. 25
Which of the following is not part of Darwin's mechanism of evolution?
a. overproduction of offspring b. competition among organisms c. acquiring traits because they are needed d. differential reproductive success e. genetic variation among individuals
Which of the following statements about the speed of impulse conduction in a neuron is true?
a. Longer axons can transmit impulses faster than shorter ones. b. Unmyelinated axons transmit impulses faster than myelinated ones. c. Shorter axons can transmit impulses faster than longer ones. d. Nerve impulses travel faster than the speed of light. e. Unmyelinated axons with larger diameters transmit impulses faster than ones with small diameters.
Which of the following statements concerning the properties of ligands for intracellular receptor systems is correct?
A) Steroids are produced from cholesterol. B) Changes in the composition of your diet can affect the concentration of some of these ligands in your body. C) Some ligands are bound to specific proteins when carried in the blood. D) both choices A and C E) choices A, B, and C