Communication between animal cells is facilitated by
A) tight junctions.
B) gap junctions.
C) adhesive junctions.
D) plasmodesmata.
E) gap and adhesive junctions.
Answer: B
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In animals, when ATP concentrations are high,
glucose is converted into
a. starch. b. glycogen. c. pyruvate. d. carbon dioxide. e. glycerol
Why do we say "waste is a human invention"?
A.Humans are more efficient at dealing with waste than nature. B.Humans produce some waste products that cannot easily be broken down. C.Only humans can violate the Law of Conservation of Matter. D."Nature" has not yet figured out what to do with waste.
If you mutate the gene encoding a Cdk such that Cdk protein product cannot bind to cyclin, what effect would you expect to see?
A) Cdk will be unaffected. B) The cell cycle will be up-regulated, and the cells will proliferate. C) Cdk will be inactive, so the target proteins will not be phosphorylated. D) Cdk will be constitutively active, so the cell cycle will be unchecked. E) Cdk will phosphorylate its target proteins regardless of the cell cycle.
Which of the following is a sex-linked recessive condition?
A) Albinism B) Down syndrome C) Cystic fibrosis D) Sickle-cell anemia E) Hemophilia