Crossing over ___________________.
A. increases variability in gametes
B. happens only once per homologous pair
C. occurs between sister chromatids
D. prevents genetic recombination
E. is followed immediately by separation of the chromatids
Answer: A
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What is a phospholipid?
A. A special kind of lipid with a water-fearing head and 2 water-loving tails B. A special kind of lipid with 2 water-loving heads and 1 water-fearing tail C. A special kind of lipid with a water-loving head and 2 water-fearing tails D. A special kind of lipid with 2 water-fearing heads and 1 water-loving tail
Beer potomania is a condition caused by excessive consumption of beer which can result in low serum sodium levels, called hyponatremia. Given what you have learned about ion concentration, what would cause the low serum sodium levels?
a. The beer binds the sodium ions on the blood and they are eliminated in the urine. b. The consumption of beer results in dehydration, and this reduces sodium ion concentration. c. Over-hydration from beer consumption causes the blood serum to be diluted, resulting in low solute concentration. d. Beer increases the permeability of the cell membranes allowing sodium to cross and resulting in serum concentrations being depleted.
Polyploidy means having
A. an abnormal number of two or more individual chromosomes. B. three or more sets of chromosomes. C. only one set of chromosomes. D. three or more chromosomes. E. an abnormal number of one particular chromosome.
Approximately how many molecules of ATP are produced from the complete oxidation of one molecule of glucose (C6H12O6 ) in aerobic cellular respiration?
A) 2 B) 4 C) 18-24 D) 30-32