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
C
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Why is there free oxygen in the air?
A. Organisms need oxygen to manufacture ATP. B. Free oxygen has been present since the formation of the earth's atmosphere. C. Evaporation of the oceans liberated oxygen. D. It is a by-product of photosynthesis. E. Free oxygen has seeped from cracks in the earth's crust.
A change in the number of single chromosomes without a change in the overall number genes is called ____ and the duplication of a whole genome is called ____.
a. haplodiploidy; dysploidy b. polyploidy; haplodiploidy c. polyploidy; dysploidy d. dysploidy; haplodiploidy e. dysploidy; polyploidy
Currently, the International Union for Conservation of Nature and Natural Resources (IUCN) does not monitor threats to:
a. vertebrates b. plants c. invertebrates d. mammals e. bacteria
Knockout experiments involving __________ genes in fruit flies (Drosophila melanogaster) revealed
local controls over gene expression. Fill in the blank(s) with the appropriate word(s).