A scientist is studying endosymbiosis in cells. This means she is investigating
A. how mitochondria and chloroplasts were derived from eukaryotic cells.
B. how mitochondria and chloroplasts were derived from prokaryotic cells.
C. how mitochondria and chloroplasts evolved into eukaryotic cells.
D. how mitochondria and chloroplasts evolved into prokaryotic cells.
B. how mitochondria and chloroplasts were derived from prokaryotic cells.
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If an organism has a single copy of each chromosome, then it is
A. aneuploidy. B. diploid. C. haploid. D. tetraploid. E. polyploidy.
Which medium can be described as a nutritionally rich medium used to grow various microor-ganisms, either as a broth or as an agar, with or without added blood?
a. Chocolate b. Colistin, nalidixic acid (CNA) blood c. Brain-heart infusion (BHI) d. Thioglycollate broth
The composition of the normal microbiota may be affected by
A. hormonal changes. B. use of antibiotics. C. obesity level. D. diet. E. All of the choices are correct.
Which line of defense is the body’s inborn, general defense mechanism?
a. adaptive immunity b. the immune system c. B and T cell activity d. innate immunity e. antibody production