Conjugating ciliates exchange a pair of haploid micronuclei that undergo mitosis as a diploid micronucleus, while the macronucleus in each
A. is expelled from the cell.
B. disintegrates.
C. divides by meiosis.
D. fuses with each other.
E. shrinks and becomes diploid micronuclei.
B. disintegrates.
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Answer the following statements true (T) or false (F)
1. During the energy investment phase of glycolysis there is a decrease of free energy that allows later reactions to be exergonic. 2. The ability of bread to rise is mainly a function of the CO2 produced during oxidative phosphorylation rather than that produced from fermentation. 3. The aerobic breakdown of glucose yields 34 to 38 ATP, while the anaerobic breakdown of glucose yields 20 ATP. 4. Secondary metabolites like caffeine are produced mainly from plant sources.
The blood-brain barrier consists of
a. membranes surrounding the neurons of the brain. b. cells lining the wall of the brain capillaries. c. vesicles of cerebrospinal fluid. d. the cerebral cortex. e. the meninges.
Mutations are regarded as a strong evolutionary mechanism for changing allelic frequencies
Indicate whether the statement is true or false
The adrenal cortex secretion that controls sodium and water reabsorption by the kidneys is _____.
A. cortisol B. epinephrine C. aldosterone D. norepinephrine E. adrenocorticotropic hormone