The diffusion of water across a plasma membrane is referred to as
A. osmosis.
B. facilitated diffusion.
C. bulk flow.
D. active transport.
E. countercurrent flow.
Answer: A
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The hormone responsible for cell differentiation, particularly xylem and phloem, in the roots is:
A. gibberellic acid. B. auxin. C. ethylene. D. abscisic acid. E. cytokinin.
The normal sex chromosomal combination for a human female is
A. XYY. B. XY. C. YY. D. XX. E. XXX.
By the endosymbiotic theory, early eukaryotes acquired the mitochondrion from a symbiotic bacteria. What happened to the bacterial genes?
a. All of the bacterial genes were lost. b. All of the bacterial genes were transferred to the nuclear genome. c. All of the bacterial genes still exist and comprise the mitochondrial genome. d. All of the bacterial genes still exist and comprise the chloroplast genome. e. Some bacterial genes transferred to the nucleus, some were lost, and some comprise the mito-chondrial genome.
Which of these is an organ of the urinary system?
a. Prostate gland b. uterus, c. rectum, d. kidney