A metabolic pathway:
a. may build or break down molecules
b. generates heat
c. can include an electron transfer chain
d. may build or break down molecules and can include an electron transfer chain
e. all of these
E
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A prenatal diagnosis procedure that has recently
come into wide use can be performed earlier than amniocentesis, and it involves sampling the a. yolk sac material. b. allantois. c. chorion. d. yolk sac. e. umbilical cord.
A fossil was found and determined by radiometric dating to be 11,400 years old. What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?
A) 12.5% B) 25% C) 37.5% D) 50%
Plants, as prey, can't run away from their predators, but they can defend themselves. Is the predatory nature of Venus flytraps a defense mechanism, or does it serve some other purpose?
What will be an ideal response?
A chemical is reported to inhibit bacterial replication. Bacterial cells are placed in medium with all nutrients necessary for replication. The chemical is added to the culture, and after a half hour an extract of the DNA is prepared. A significant percentage of the DNA is in pieces about 1000 to 2000 bases in length. The results are consistent with the chemical blocking the function of DNA ligase.
Answer the following statement true (T) or false (F)