Which of the following statements regarding the hepatitis D virus (HDV) is MOST correct?
A) The typical incubation period for HDV infection ranges from 180 to 360 days.
B) The most common route of transmission of HDV is through sexual contact.
C) Infection with HDV requires the host to be infected with the hepatitis B virus.
D) If a documented exposure occurs, testing begins with the person who was exposed.
Answer: C) Infection with HDV requires the host to be infected with the hepatitis B virus.
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Viral gastroenteritis that affects people of all ages and usually lasts less than 3 days is caused by
A. herpes. B. hepatitis B. C. norovirus. D. rotavirus.
Four of the five choices listed below concern cells
with two chromosome sets. Select the exception. a. zygote b. somatic cells c. gamete d. diploid e. sporophyte generation
Which of the following is a serious concern when performing PCR?
A. Restriction enzymes are difficult to obtain in adequate quantities. B. The high temperature needed may denature the DNA. C. Lab personnel may be exposed to radiation. D. PCR is a very time-consuming process. E. Contaminating DNA may be introduced and amplified.
The flow rate of a gas through a tube is proportional to the diameter of the tube. Through which structure in the human respiratory system does air flow the fastest?
A) bronchiole B) trachea C) bronchus D) alveoli