Kidneys are thought to have evolved first among the ________.
A. reptiles
B. saltwater bony fishes
C. mammals
D. amphibians
E. freshwater bony fishes
Answer: E
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Which statement is NOT true about the development of an action potential?
Select one: a. There is a rapid change in polarity from about -65 mV to about +40 mV. b. It requires two types of gated channels. c. The action potential ends when the polarity across the membrane reaches +40 mV. d. Depolarization occurs when sodium gates open and allow sodium ions to enter the cell. e. Potassium gates open after the sodium gates and allow potassium ions to leave the cell.
Proprionibacterium acnes, the causative agent of acne vulgaris, is present on the skin of
a. all people, regardless of age. b. teenagers only. c. people with acne only. d. people with very oily skin.
At the molecular level, which of the following best explain heterozygous advantage and overdominance?
A. A heterozygous individual can produce more varieties of homodimer proteins B. The alleles produce two different proteins with slightly different functions C. The proteins produced by the alleles may provide a broader range of environmental tolerance, such as temperature ranges D. Infectious organisms may recognize only a specific functional protein E. All of the answers are possibilities
A fossil is defined as any evidence of an organism from more than years ago.
A. 10,000 B. 25,000 C. 1,000 D. 500 E. 100,000