The bones in the forelimbs of a mammal ____
a. can often be traced to a common ancestor
b. offer no evidence to support the theory of evolution
c. perform the same function no matter which species they are in
d. may exhibit either analogy or homology but not both when compared to the forelimb of another animal
e. show convergence with some invertebrate structures
ANSWER: a
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Why do most viruses only infect one type of cell?
a. Viruses can only live in particular environments found within a select group of cells. b. Viruses can only find the necessary components to keep itself alive in one type of cell. c. Viruses can only infect cells that have the appropriate receptors for them to attach to. d. Viruses cannot move throughout the body so only infect the cells they first come into contact with.
What must pyruvic acid be converted to before it can enter the citric acid cycle?
A) acetyl CoA B) lactic acid C) ethyl alcohol D) citric acid
Which of the following rows is a correct match?
A. Row 1
B. Row 2
C. Row 3
D. Row 4
In the fluid mosaic model of cell membranes, what does the "fluid" part of the model refer to?
a. the constant movement of the hydrophilic tails in the interior of the membrane b. the phospholipid molecules, which freely move and exchange places with other lipids within the same half of the bilayer c. the free movement of cholesterol molecules within the membrane d. a thin layer of water found sandwiched between the two layers of phospholipids