What is the main component of an animal cell membrane?
A. glycolipids
B. phospholipids
C. cholesterol
D. polynucleotides
E. aquaporins
Answer: B
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Besides Darwin, the theory of evolution by means of natural selection was also independently proposed by:
A. Charles Lyell. B. Karl Popper. C. Thomas Malthus. D. Peter Raven. E. Alfred Wallace.
The human body requires about ____ of fat each day to stay healthy
a. 1 teaspoon b. 4 teaspoons c. 1 tablespoon d. 4 tablespoons e. 1 cup
An ionic bond forms when
A. an electrical attraction occurs between two atoms of different charge. B. a nonpolar attraction is formed between two atoms. C. a valence electron is shared between two atoms. D. two atoms have similar attraction for electrons.
Chemical reactions that can proceed toward either anabolism or catabolism are called
A) glycolytic. B) light-independent. C) synthetic. D) cyclic. E) amphibolic.