The specialized structure that stores pigments, water, inorganic ions and maintains turgor pressure is the
A. Golgi apparatus.
B. vacuole.
C. peroxisomes.
D. vesicles.
E. lysosomes.
B. vacuole.
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Using sequence data, it has been shown that:
A. humans evolved from the Neanderthals. B. Homo sapiens arose gradually in many places. C. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Africa. D. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Asia. E. Homo sapiens evolved from Homo erectus.
There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. Which of the following best explains this phenomenon?
A. Sexual selection. B. Balancing selection. C. Bottleneck effect. D. Heterozygote advantage. E. Founder effect.
In a frog in which the diploid number of chromosomes per cell is 24, what is the total number of chromatids present
per cell in prophase II after the first division and cytokinesis?
a. 0 b. 6 c. 12 d. 24 e. 48
The relationship above is
a. a parasitic association. b. predation. c. resource partitioning. d. a mutualistic association essential to the fish but not the anemone. e. none of these.