The protein that represses the lytic genes of bacteriophage ? is:
A. Cro.
B. N.
C. LexA.
D. cI.
D
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Which of the following is true about the structure of DNA?
A. Purine and pyrimidine bases are joined by phosphodiester bonds. B. Adjacent bases are stacked on top of each other, one base pair every 0.34 nm. C. Purine and pyrimidine bases are attached to the 1'-carbon of the deoxyribose sugars. D. All of the choices are correct.
Choose the organelle in column 2 that best matches the activity in column 1.
A) There is no appropriate match. B) Mitochondria C) peroxisomes D) mitochondria E) there is no appropriate match F) lysosome G) smooth endoplasmic reticulum 1) test for catalase activity 2) test for the TCA cycle enzymes 3) test for the presence of cytochromes 4) look for fractions that are green 5) hydroxylation of compounds including phenobarbital 6) presence of acid hydrolases 7) ribulose bisphosphatase activity is present
The bone in the upper arm is the
a. radius. b. ulna. c. tibia. d. humerus. e. femur.
Which of the following statements about biological diversity is NOT true?
A. Many species that are in danger of extinction have not been identified and studied. B. Biodiversity is evenly distributed throughout the biosphere. C. Scientists estimate that 10-50 million species exist. D. Biodiversity refers to the variety of life on Earth. E. Biodiversity is described in terms of genetic, community, and landscape diversity.