Which allele combination represents a heterozygous individual?
A. Aa
B. AA
C. aa
D. None of these represent a heterozygous individual.
Answer: A
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Which one of the following statements about pH is incorrect?
A. An acidic solution has a higher concentration of protons than hydroxide ions. B. Physiological pH is defined as the pH of pure water, 7.0. C. Some cellular compartments have different pH values than others. D. The pH of a solution can range from 0 to 14. E. A solution of pH 5 has a proton concentration 100 times greater than a solution of pH 7.
At rest, neurons exhibit a negative membrane potential. Among the factors that maintain this polarity, assess which is most DIRECTLY responsible for the difference between intracellular and extracellular ion concentrations?
A. movements of negatively charged proteins and nucleic acids across the membrane. B. passive leakage of Na+ ions across the membrane. C. passive leakage of K+ ions across the membrane. D. movement of Na+ ions through voltage-gated Na+ channels. E. movement of K+ ions through voltage-gated K+ channels.
The two closely allied organ systems that allow for running, swimming, and flying under the direction of the nervous system are the _____ systems.
A. skeletal and endocrine B. muscular and endocrine C. muscular and skeletal D. circulatory and muscular E. circulatory and skeletal
The Immigration Restriction Act of 1924 was supported by research that demonstrated that Western Europeans were
genetically superior to Eastern Europeans. a. True b. False