The original three components of the cell theory are that all organisms
A. have DNA, DNA is the fundamental unit of life, and all cells come from preexisting cells.
B. are made of one or more cells, the cell is the fundamental unit of life, and all cells come from preexisting cells.
C. are made of one or more cells, the cell is the fundamental unit of life, and all cells have a nucleus.
D. have DNA, are made of cells, and all cells produce proteins.
E. are made of one or more cells, all cells contain DNA, and all cells come from preexisting cells.
B. are made of one or more cells, the cell is the fundamental unit of life, and all cells come from preexisting cells.
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Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through _____
A) plasmodesmata B) intermediate filaments C) tight junctions D) desmosomes E) gap junctions
A population of lizards lives in a rocky area next to a desert. Some lizards are light colored and blend into the sand. Others are dark and blend into the rocks. What may happen to this population of lizards over time?
A. They may evolve into two separate species as a result of directional selection. B. They may remain one species as a result of stabilizing selection. C. They may remain one species as a result of disruptive selection. D. They may evolve into two separate species as a result of disruptive selection. E. They may remain one species as a result of directional selection.
If a cell has 36 chromosomes at the beginning of G1, how many chromosomes will be present at the end of G2?
a. 36 b. 18 c. 72 d. 64 e. 44
In mammals, which reaction to cold limits the amount of heat an animal loses to its surroundings?
a. shivering b. pressing hair shafts close to the body c. reducing blood flow to the skin d. going off to lie alone so that others do not take their heat