A man with type AB blood marries a woman with type O blood. How many blood types could arise in their offspring?
a. one
b. three
c. two
d. four
c. two
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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.
Answer the question using the accompanying figure. Which numbers identify structures that are found in all
prokaryotes?
a. 2 and 4 b. 3 and 4 c. 1 and 5 d. 5 and 9 e. 7 and 8
If a nail is pounded into the trunk of a tree, what plant structure would it encounter first?
A) phloem B) xylem C) cork D) cork cambium
The repeated use of which drug leads to the body decreasing the natural production of endorphins?
A. methamphetamine B. heroin C. ecstasy D. marijuana E. K2