According to research done by Baron and Prado, how do prions move within the CNS?
a. They use receptors on the surfaces of nerve cells.
b. They use vesicles found inside the nerve cells.
c. They use tunneling nanotubes.
d. They pinch off the nerve cell membrane.
e. They stick to the outer surfaces of nerve cells.
ANSWER: c
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Answer the following statements true (T) or false (F)
1. Genes that are expressed only when needed are called constitutive genes. 2. Polysaccharides, polypeptides, and nucleic acids are all examples of polymers. 3. During translation, amino acids are “activated” by attaching to an appropriate rRNA molecule. 4. The peptide bonds that hold amino acids together in protein molecules are examples of covalent bonds. 5. In double-stranded DNA molecules, the two strands are held together by hydrogen bonds.
Mad cow disease is caused by a
A. bacterium. B. virus. C. viroid. D. virion. E. prion.
The nucleus of an atom contains
a. neutrons and protons. b. neutrons and electrons. c. protons and electrons. d. protons only. e. neutrons only
In phi X 174 phage, whose genome is a single-stranded, circular DNA known as the – strand, replication occurs by the rolling circle method. In which order must the events of replication occur?
A) nicking of the – strand, binding of relaxase protein to the 5? end, DNA synthesis of a + strand, separation of + from – strands, circularization of both strands B) synthesis of a + strand, nicking at the origin, binding of protein to the 5? end, DNA synthesis, displacement of the + strand when replication passes the origin, circularization of the + strand C) synthesis of a + strand, nicking of both strands to separate them, recircularization of both strands D) binding of a protein at the origin of the – strand, synthesis of a + strand, release of the + strand