Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labelled viruses that insert their DNA into the DNA of the cells that they infect. Also suppose that the viral DNA is then treated as part of the cell's own DNA, and is replicated during DNA replication and passed on to daughter cells when the cell divides. You infect a population of cells with the 32P-labelled viruses, and then let the infected cells go through two generations of cell divisions. In how many cells should you find 32P-labelled DNA?
a. in none of them
b. in about one-quarter of them
c. in about one-half of them
d. in about three-quarters of them
Answer: c. in about one-half of them
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C3 plants are more susceptible to photorespiration than either C4 or CAM plants, so why do most
plants lack the C4 pathway?
a. Rubisco is more efficient in C3 plants when compared to rubisco C4 and CAM plants. b. Photorespiration is not a serious problem for most plants. c. Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during the night. d. There is an energetic cost to C4 and CAM pathways that only makes them advantageous in very hot and/or arid environments. e. Switching between C3, C4, and CAM photosynthesis is very difficult for most plants.
The pulmonary circuit ____
a. involves the hepatic portal vein b. moves oxygen-rich blood to the kidneys c. includes the coronary arteries d. leads to, through, and from the lungs e. receives blood from the left ventricle
The suffix -itis means ________.
A. blood B. a disease or morbid process C. pertaining to D. tumor E. an inflammation
What organic molecules is the primary structural component of cell membranes?
a. cellulose b. glycogen c. disaccharides d. phospholipids e. adenine triphosphatec