DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase?
A) The two strands of the double helix would separate.
B) The phosphodiester bonds between deoxyribose sugars would be broken.
C) The purines would be separated from the deoxyribose sugars.
D) The pyrimidines would be separated from the deoxyribose sugars.
E) All bases would be separated from the deoxyribose sugars.
Answer: B
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A bacterium is found that is resistant to the antibiotic gentamicin. The bacterium was isolated in a hospital where patients were routinely given gentamicin for a variety of infections. What was the pressure that selected for this resistant population?
A) presence of gentamicin in the environment B) high mutation rate for the bacterium C) growth situation for the bacterium D) patients that did not receive the antibiotic
If an object were collected on Mars by the rover Curiosity, it would be considered a living organism if it ________
A) responded to environmental stimuli B) had metabolic activities and maintained homeostasis C) contained DNA and reproduced D) All of the above are true.
Match the molecules below with their functions.
A. Main storage carbohydrate in animals B. The main component of plant cell walls C. Main storage carbohydrate in plants D. Main component of cell membranes E. Waterproofs biological structures F. Responsible for sexual development G. Precursor for important molecules such as bile salts H. Contains information to build a new cell I. Active role in protein synthesis
The ________ can differentiate into stems, leaves, or flowers.
A. shoot meristem B. central region C. basal region D. suspensor E. root meristem