Cell membranes consist mainly of a __________.
A) carbohydrate bilayer and proteins
B) protein bilayer and phospholipids
C) lipid bilayer and proteins
Ans: C) lipid bilayer and proteins
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The first step in the scientific method is to
a. identify a problem. b. propose a solution. c. predict the results of an experiment. d. perform an experiment. e. draw a conclusion.
At what stage of mitosis do sister chromatids become full-fledged chromosomes?
A. cytokinesis B. telophase C. anaphase D. metaphase E. prophase
The study of the interactions of organisms and their physical environment is
a. biology. b. ecology. c. geology. d. paleontology. e. physiology.
Mammal-like reptiles arose during which time period?
a. Triassic period b. Cambrian period c. Devonian period d. Cretaceous period e. Carboniferous period