The plasma membranes of root hair cells contain a variety of protein transport channels through which specific ions are transported, even against large concentration gradients, by
A. carbohydrate pumps.
B. water pumps.
C. hydrogen ion pumps.
D. root pumps.
E. electron pumps.
Answer: C
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Each codon consists of how many bases?
a. 3 b. 9 c. 16 d. 64 e. 128
Which of the following characteristics of light is most commonly used for defining light as a portion of the electromagnetic spectrum?
a. the fact that all living organisms can detect it b. the fact that plants can detect it c. the fact that humans can detect it with their eyes d. the fact that non-human animals can detect it with their eyes
Which of the following statements about a gram-positive cell wall is false?
A) It maintains the shape of the cell. B) It is sensitive to lysozyme. C) It protects the cell in a hypertonic environment. D) It contains teichoic acids. E) It is sensitive to penicillin.
Which of the following takes place during translation?
A) the conversion of genetic information from the language of nucleic acids to the language of proteins B) the conversion of genetic information from DNA nucleotides into RNA nucleotides C) the conversion of genetic information from the language of proteins to the language of enzymes