In which phase do the following events occur: the chromatin condenses into chromosomes, the nuclear membrane disintegrates, and the centrioles migrate to the poles as spindle fibers are organized?
A) interphase
B) anaphase
C) prophase
D) telophase
C
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Which of the following examples describes a behavioral pattern that results from a proximate cause?
A) A cat kills a mouse to obtain nutrition. B) A male sheep fights with another male because it helps to improve its social position. C) A female bird lays its eggs because the amount of daylight is decreasing slightly each day. D) A goose squats and freezes motionless to escape a predator. E) A cockroach runs into a crack in the wall to avoid being stepped on.
more efficient in producing carbohydrates
b. predominates in C3 plants in cool weather when water is plentiful. c. predominates in C4 plants on hot days. d. produces the same amount of PGA. e. does none of these.
Although bacteria lack membrane-bound organelles, such as chloroplasts and mitochondria, they can still perform the
functions of these organelles by localizing certain metabolic enzymes on: a. ribosomes. b. the cell wall. c. the plasma membrane. d. the nuclear membranes. e. the endoplasmic reticulum.
Which of the following statements describe a reason ribosomal genes are useful for comparing evolutionary relationships among organisms?
A. It is possible to compare the large subunit genes with the small subunit genes. B. Ribosomes of prokaryotes and eukaryotes are identical. C. There are many differences in these genes, even among closely related species. D. All organisms possess these genes and they can be compared with each other. E. These are the only genes that have been sequenced for every organism on Earth.