What are the main differences between plant and animal cells?
A.) Animal cells are eukaryotes and plant cells are not.
B.) Plant cells are eukaryotes and animal cells are not.
C.) Animal cells have cell walls and chloroplasts; plant cells do not.
D.) Plant cells have cell walls and chloroplasts; animal cells do not.
Ans: D.) Plant cells have cell walls and chloroplasts; animal cells do not.
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Horizontal gene transfer in Archaea
A) is infrequent in nature and therefore difficult to use for genetic studies in the laboratory. B) has not been documented, thus all genetic studies of archaea are done via genomic sequencing. C) frequently occurs in nature and has been used to perform genetic studies in the laboratory as well. D) frequently occurs in nature, but there are very few laboratory studies because archaea do not cause human disease.
A region of the brain receives both sensory information from ascending nerve tracts and motor commands from the cortex and cerebellum. This region plays an important role in motor control. Which region is it?
A. basal ganglia B. pituitary gland C. parietal lobe D. thalamus E. medulla oblongata
The components of membranes that account for
most of their active functions are a. carbohydrates. b. sterols. c. proteins. d. fats. e. phospholipids.
Antibody diversity is due to genetic influences on the:a
Fc region. b. heavy chain. c. variable region. d. light chain. e. constant region.