Growth that results in an increase in stem or root length occurs in which specific area of the plant?
a. lateral meristem
b. apical meristem
c. vascular cambium
d. cork cambium
e. periderm
B
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Polyploid plants are often unhealthy as compared to other plants
Indicate whether the statement is true or false.
What is the function of the nodes of Ranvier?
a. regenerate resting membrane potential after an action potential b. reduce current leakage from unmyelinated axon regions c. speed up action potential propagation by salutatory conduction d. store excess sodium and potassium ions between action potentials
Active immunity may be produced by
a) having a disease b) receiving a vaccine c) receiving gamma globulin injections d) both a and b e) both B and C are correct
If the input water is labeled with a radioactive isotope of oxygen, 18O, then the oxygen gas released as the reaction proceeds is also labeled with 18O. Which of the following is the most likely explanation?
(A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released.