Restriction endonucleases in bacteria may have evolved in order to ________.
A. carry out natural genetic engineering
B. use nucleic acids as a food (energy) source
C. protect the bacteria from infection by viruses
D. All of the choices are correct.
Answer: C
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The bond that builds amino acid monomers into protein polymers is
A. a covalent bond also known as a peptide bond. B. a denatured hydrogen bond. C. a covalent bond also know as a glycosidic bond. D. an ionic bond also known as a peptide bond. E. a primary structural bond.
The placenta develops from the endometrium while the fetus develops from embryonic tissue.
Answer the following statement true (T) or false (F)
Which of the following is not a strategy of the body to defend against foreign organisms and cancer cells?
A) physical barrier B) adaptive immune response C) internal cellular defense D) antibiotic pills
What sort of media can be used to encourage growth of some organisms, while discouraging the growth of others?
A. Selective media B. Differential media C. Complex media D. Defined media