Accumulation of __________ contributes to muscle fatigue
a. ATP
b. creatine phosphate
c. glycogen
d. lactic acid
e. carbon monoxide
D
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How many neutrons are in a typical oxygen atom?
A. 18 B. 12 C. 8 D. Not enough information given
Which of the following types of molecules are the major structural components of the cell membrane?
A) phospholipids and cellulose B) nucleic acids and proteins C) phospholipids and proteins D) proteins and cellulose E) glycoproteins and cholesterol
You and a friend are student assistants in a research laboratory that investigates the anti-cancer properties of proteins isolated from marine organisms. Your friend mentions that she is using a BAC vector to insert shark DNA into Escherichia coli, but after repeated attempts, has found that the bacterial cells fail to synthesize the encoded protein. What is your advice?
A. Since shark DNA is eukaryotic, the cloning vector should be a YAC derived from yeast rather than a BAC derived from bacteria. B. If the shark DNA is unmodified, it contains introns that are not recognized by bacteria, therefore protein synthesis will not occur. C. It is impossible to clone eukaryotic DNA into a bacterial host, since eukaryotic DNA has introns and prokaryotic DNA does not. D. Because Escherichia coli is not naturally competent, it cannot serve as the cloning host for foreign DNA.
Which of the following structures of the eye is matched appropriately with its developmental material?
a. cornea ? ectoderm b. cornea ? crystallin c. lens ? optic cup d. retina ? crystallin e. retina ? ectoderm