The major cell surface receptor(s) responsible for the attachment of cells to the extracellular matrix is (are)
a. hemidesmosomes.
b. desmosomes.
c. integrins.
d. laminin.
Ans: c. integrins.
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Which of the following types of contractions generate the greatest force?
A. lengthening contractions B. shortening contractions C. isometric contractions D. contractions with rapid shortening velocities E. contractions with shortening velocities equal to zero
With sexual reproduction, two genes for the same trait that are slightly different are called __________. Fill in the blank(s) with the appropriate word(s)
A DNA molecule has four "ends"— two on each of the two polynucleotide strands. How many of
these ends are phosphate groups? Fill in the blank(s) with the appropriate word(s).
All of these humans are believed to have evolved in Africa EXCEPT
Select one: a. Homo erectus. b. Homo habilis. c. Homo rudolfensis. d. Neandertals. e. Homo ergaster.