DNA gyrase
A. unwinds DNA.
B. supercoils DNA.
C. joins free DNA ends.
D. cleaves DNA.
Answer: B
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Humans with mutations in the gene encoding AQP1 (aquaporin-1) that cause the absence of AQP1are
characterized by an inability to ____.
a. concentrate urine despite prolonged thirsting d. control sweating b. control edema e. salivate c. make large volumes of dilute urine
Which of the following statements about the botulism toxin is NOT true?
a. It is an exotoxin. b. It is produced by the bacterium Clostridium. c. It may be found as a contaminant in poorly prepared food. d. Its brand name is Botox. e. It causes muscles to contract.
DNA is present in all of the following human cell types except ________
A) skin cells B) erythrocytes (mature red blood cells) C) leukocytes (white blood cells) D) hair E) buccal (cheek) cells
Which of the following organelles contains a green-colored pigment?
A. lysosome B. mitochondria C. chloroplast D. leucoplastosome