Which of the following statements is
CORRECT?
a. A population cannot exceed the carrying
capacity even temporarily.
b. An organism can occupy more than one
trophic level, depending upon the feeding
habits of the organism.
c. Once populations of organisms become
isolated, they remain so by various types of
isolation mechanisms.
d. The limits of a population are all traced to
climatic or physical factors.
e. Organisms with different evolutionary
backgrounds can occupy the same niche at
the same time.
B
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During prophase II,
a. a new bipolar spindle forms. b. crossing over occurs. c. chromosomes are single-stranded. d. the cell is diploid. e. the nuclear envelope re-forms.
Individuals in this group often have intracellular shells of interlocking plates
a. green algae b. red algae c. euglenoids d. dinoflagellates e. diatoms
A prenatal diagnosis procedure that can be performed earlier than amniocentesis involves sampling the _____.
A. yolk sac material B. allantois C. chorion D. yolk sac E. umbilical cord
The first energy-generating steps in glycolysis begin when glyceraldehyde 3-phosphate undergoes an energetically favorable reaction in which it is simultaneously oxidized and phosphorylated by the enzyme glyceraldehyde 3-phosphate dehydrogenase to
form 1,3-bisphosphoglycerate, with the accompanying conversion of NAD+ to NADH. In a second energetically favorable reaction catalyzed by a second enzyme, the 1,3-bisphosphoglycerate is then converted to 3-phosphoglycerate, with the accompanying conversion of ADP to ATP. Which of the following statements is true about this reaction? (a) The reaction glyceraldehyde 3-phosphate -> 1,3-bisphosphoglycerate should be inhibited when levels of NADH fall. (b) The ?G° for the oxidation of the aldehyde group on glyceraldehyde 3-phosphate to form a carboxylic acid is more negative than the ?G° for ATP hydrolysis. (c) The energy stored in the phosphate bond of glyceraldehyde 3-phosphate contributes to driving the reaction forward. (d) The cysteine side chain on the enzyme is oxidized by NAD+.