A gap junction is a channel that connects adjacent cells. Which one of the following cannot pass through a gap junction?
A) ions that can regulate heartbeat
B) amino acids
C) nucleotides
D) ribosomes
Answer: D
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Which type of cellular junction allows for the movement of proteins and transfer RNA molecules?
A. desmosomes B. plasmodesmata C. gap junctions D. Answers b and c are both correct.
Which statement about mutations is not true? (Choose all that apply)
A. Mutations make evolution possible. B. Mutations result in genetic variation among individuals. C. Mutations accumulate in a genome over time. D. Mutations are usually caused by exposure to radiation. E. Mutations can be harmful, beneficial or neutral. F. Mutations occur as a direct response to an organism's attempt to change one of its traits.
The integumentary system
a. covers and protects the body. b. connects muscles to skin. c. suspends organs in the abdominal cavity. d. contains endocrine glands. e. regulates muscle control
Photorespiration What happens in photorespiration that is more energetically costly than the Calvin cycle?
a) Rubisco's active site combines with oxygen instead of carbon dioxide. b) Rubisco's active site combines with carbon dioxide instead of glucose. c) Rubisco's active site combines with water instead of carbon dioxide. d) Rubisco's active site combines with glucose instead of oxygen. e) Rubisco's active site combines with glucose instead of carbon dioxide.