Carbon dioxide absorption is an appropriate indicator of photosynthesis because
A) CO2 is needed to produce sugars in the Calvin cycle.
B) CO2 is needed to complete the light reactions.
C) plants produce oxygen gas by splitting CO2.
D) the energy in CO2 is used to produce ATP and NADPH.
Answer: A
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When considering DNA and RNA, which of the following statements is generally FALSE?
a. There are five major types of nitrogenous base. b. There are two types of purines and three types of pyrimidines. c. There are two types of purines and two types of pyrimidines. d. A free 3' hydroxyl group is found in deoxyribose. e. A free 3' hydroxyl group is found in ribose.
A stigma is a:
A) light-sensing organelle. B) primitive mouth. C) thickened membrane. D) type of plastid.
In which phase of translation are peptide bonds formed?
a. replication
b. transcription c. initiation d. elongation e. termination
When we look at infectious disease statistics for the global human population as a whole, we find the number one cause of death is
A) malaria. B) parasitic diseases such as worms. C) respiratory infections. D) heart disease.