Hepatitis B virus
A. is transmitted to newborns from chronic carrier mothers.
B. has many chronic carriers.
C. is principally transmitted by blood.
D. transmission risks include shared needles, anal intercourse, and heterosexual intercourse.
E. All of the choices are correct.
Answer: E
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Which pertains to DNA but not to RNA?
A. Contains adenine B. Contains uracil C. Contains nucleotides D. Contains thymine E. Contains ribose
Coastal regions where seawater mixes with fresh water from rivers, streams, and runoff are called
____.
a. neritic zones b. estuaries c. benthos d. wetlands e. intertidal zones
Which of the following does not apply to eukaryotic gene regulation?
A) gene regulation by attenuation B) regulation as a result of compartmentalization C) mRNA degradation (turnover) D) protein degradation (turnover) E) protein folding
Viral envelopes are composed of ________.
A. lipids B. carbohydrates C. proteins D. All of the choices are correct.