Which statement describes the greenhouse effect?
A) Most life on Earth relies upon the hospitable temperatures resulting from the greenhouse effect.
B) The greenhouse effect is a dangerous phenomenon that should be stopped as soon as possible.
C) The greenhouse effect results from the presence of oxygen in the atmosphere.
D) Global warming is likely the result of a lessening of the greenhouse effect.
A
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In experiments designed as those of Hershey and Chase (1952), 35S was added to a virus replicating within its bacterial host. The new virions were carefully isolated and used to infect fresh bacterial cells in the absence of any radioisotopes. Where would you expect to find the 35S radioisotope?
A) in the phage ghosts B) in the bacterial matrix proteins C) in the bacterial DNA D) in the nucleic acid of the new virions E) in the protein coat of the new virions
What is a lysosome's role in intracellular digestion?
a. absorption b. enzymatic digestion c. filtration d. mechanical digestion e. produces energy
In what way is a member of domain Archaea similar to a member of domain Bacteria?
A) They are both photosynthetic. B) They both live in extreme environments. C) They both have DNA enclosed in a nucleus. D) They are both prokaryotic cells.
Nutrient molecules are used to build cellular structures or for energy. This best represents which characteristic of life?
a) living things are adapted b) living things respond to stimuli c) living things are homeostatic d) living things grow and develop e) living things acquire materials and energy from the environment