Which of the following diseases is (are) caused by prions?
A. Mad cow disease
B. Scrapie
C. Kuru and Creutzfeldt-Jakob Disease
D. All of the choices are correct.
Answer: D
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Which of the following phrases INCORRECTLY finishes this statement? Stem cells
A. can undergo mitosis. B. can differentiate into more than one type of specialized cell. C. vary in their potency. D. are only found in embryos. E. can sometimes only differentiate into one cell type.
Answer the following statements true (T) or false (F)
1. The covalent bonds that hold monosaccharides together in a polysaccharide are called glycosidic bonds. 2. A DNA nucleotide consists of the following three parts: a nitrogenous base, ribose, and a phosphate group. 3. The waxes in the cell walls of Mycobacterium tuberculosis cause this organism to be acid-fast. 4. The basic structure of a cell membrane is a lipid bilayer. 5. DNA polymerase is the only enzyme required for DNA replication.
Position of gonads varies in different animal groups. An octopus has gonads _____
a. on the back of its head b. at the ends of its arms c. in the abdominal cavity d. in the coelom
e. on its penisWhat is similar about G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs)?
A. Both are directly bound to G proteins B. Both can activate phospholipase C C. Both are enzymes D. Both are activated by autophosphorylation