Which of the following prokaryotic nutritional
groups use CO2 and sunlight to produce
energy?
a. photoautotrophs
b. chemoautotrophs
c. photoheterotrophs
d. chemoheterotrophs
e. all of these
A
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To promote the translational activity of ribosomes in human cells for synthesizing viral proteins during viral infection, viruses
A) chemically modify (e.g., cap and methylate) the transcripts. B) keep a ribosome binding site specific to human ribosomes on their genome. C) maintain introns and sometimes extrons in their genomes to appear as eukaryotic mRNA. D) only adhere to and infect metabolically active host cells where protein synthesis is high.
What condition develops when GABA levels in the brain are deficient?
A. epilepsy B. insomnia C. Huntington's disease D. Alzheimer's disease E. Parkinson's disease
Enzymatic digestion of proteins starts in the
A. mouth. B. esophagus. C. stomach. D. small intestine.
At the end of an experiment, a conclusion is formed based on:
A. the feelings or beliefs of the scientist conducting the experiment B. the needs of the group funding the experiment C. the general observations during the experiment D. the statistical analysis of the experiment