A human skin cell is ________, while a human sperm cell is ________
A) diploid; haploid
B) haploid; diploid
C) diploid; diploid
D) 1n; 2n
A
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The process by which homologous chromosomes exchange genetic material
A. is crossing-over. B. occurs only during DNA replication. C. is independent assortment. D. is random fertilization. E. occurs only in animals.
Why do electron microscopes have the ability resolve such small objects?
a. Because electrons have a much shorter wavelength than the photons of visiblelight b. Because electrons have a much longer wavelength than the photons of visiblelight
Sulfur has an atomic number of 16. How many covalent bonds can sulfur form?
A) 1 B) 2 C) 4 D) 0
When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. This does not happen to plant cells, because _____
A) they have large central vacuoles, which provide abundant space for storage of incoming water B) they have cell walls, which prevent the entry of water by osmosis C) they have cell walls, which provide pressure to counteract the pressure of the incoming water D) certain gated channel proteins embedded in their plasma membranes open as osmotic pressure decreases, allowing excess water to leave the cell