It is estimated that humans have approximately ________ base pairs in our genome.
A. 180 million
B. 2.5 million
C. 3 billion
D. 12 trillion
Answer: C
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Nitrogen is made available to plants for their use by the process(es) of ____
a. ammonification only b. nitrification only c. nitrogen fixation only d. ammonification and nitrification only e. ammonification, nitrification, and nitrogen fixation
Aquaporins are
a. channel proteins for water. b. carrier proteins for solutes. c. channel proteins for solutes. d. carrier proteins for water. e. carrier proteins for water and solutes.
The important feature of all cells that react to a
specific hormone is the a. type of blood supply they receive. b. proximity of the endocrine gland. c. presence of an appropriate receptor molecule. d. characteristic of their mitochondrial membrane. e. presence of specific genes responsive to the hormone.
From their formation to ejaculation, sperm cells take the following pathway:
A. seminiferous tubule, epididymis, rete testis, urethra, ejaculatory duct, ductus deferens. B. seminiferous tubule, epididymis, rete testis, ejaculatory duct, ductus deferens, urethra. C. seminiferous tubule, epididymis, rete testis, ductus deferens, ejaculatory duct, urethra. D. seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra. E. seminiferous tubule, rete testis, epididymis, ejaculatory duct, urethra, ductus deferens.