In which plant type is water not required for fertilization?
a. gnetophytes
b. mosses
c. ferns
d. hornworts
e. horsetails
a
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CAM plants differ from C4 plants in that CAM plants ________ while C4 plants ________
a. none of the choices b. fix carbon in two separate chambers to keep CO2 high near rubisco / fix carbon mostly at night c. produce 3-carbon PGA as the first stable intermediate / produce 4-carbon oxaloacetate as the first stable intermediate d. open stomata and fix carbon using a C4 pathway at night / fix carbon first in mesophyll cells and again in bundle sheath cells
Which of the following are not considered microorganisms?
A. Protozoa B. Mosquitoes C. Bacteria D. Fungi E. Viruses
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger radioactive signal than labeling the phosphates. Why won't this experiment work?
A. Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins. B. The phosphate in normal DNA is naturally radioactive. C. Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive. D. There is no radioactive isotope of nitrogen.
Plant cells
A) lack mitochondria and chloroplasts. B) lack mitochondria but have chloroplasts. C) have mitochondria but do not have chloroplasts. D) have mitochondria and chloroplasts.