Which of the following statements regarding the association of hepatitis B with liver cancer is FALSE?
A) Geographic areas with a high incidence of liver cancer also have a high prevalence of hepatitis B.
B) The HBV genome has been found integrated into hepatic cancer cells.
C) Hepatic cancer cells typically express HBV antigen.
D) Chronic carriers of the virus are 200 times more likely to develop hepatic cancer.
E) Vaccination does not provide protection against the development of hepatic cancer.
E
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What statement is correct in the following statment?
A. Speciation that begins with geographic isolation is known as allopatric speciation B. Allopatric speciation only happens in dispersal geographic isolation C. Speciation that begins with geographic isolation is known as sympatric speciation D. Sympatric speciation only happens in dispersal geographic isolation
The most common form of calcium has 20 protons, 20 nuetrons and 20 electrons. Which of the following element is an isotope of calcium?
a. an atom with 21 protons, 20 neutrons, 21 electrons b. an atom with 20 protons, 20 neutrons, 18 electrons c. an atom with 21 protons, 21 neutrons, 21 electrons d. an atom with 20 protons, 21 neutrons, and 20 electrons
________ occurs when a molecule binds to an enzyme at a site other than the active site, causing a change in the enzyme that decreases the enzyme's ability to bind to its substrate.
a) Fermentation b) Allosteric inhibition c) Oxidative phosphorylation d) Allosteric activation
Eating food contaminated with ________ may result in meningitis in at-risk persons
A) Mycoplasma hominis B) Staphylococcus aureus C) Listeria monocytogenes D) Clostridium perfringens E) Enterococcus faecalis