Most reactions in the body occur too slowly to sustain life. This is because
A) there is not enough ATP in body cells.
B) many reactions require large inputs of activation energy.
C) no catalysts are present in body cells.
D) all reactions in the body are endergonic.
E) most biological catalysts are not active at body temperature (37°C).
B
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Which group of bacteria is most famous for their diversity of antibiotics produced? Hypothesize an ecological role production of these antibiotics might have in such environments where they are not produced at high enough levels to kill bacteria
What will be an ideal response?
Bacteriophages and animal viruses
A. both may enter a host cell by endocytosis. B. both may enter a host cell by fusion. C. both involve entry of the entire nucleocapsid. D. differ because bacteriophages leave the capsid outside the cell, while animal virus entry involves the entry of the whole nucleocapsid.
In which cavity does the human heart lie?
a. thoracic b. pelvic c. abdominal d. cranial e. spinal
All aminoglycoside antibiotics function by
A. blocking DNA transcription. B. blocking absorption at the cell membrane. C. interfering with cell wall synthesis. D. attaching irreversibly to bacterial ribosomes. E. preventing normal metabolic functions.