Prions are composed of
a. DNA.
b. RNA.
c. protein.
d. DNA and protein.
e. DNA, RNA, and protein.
C; Prions are infectious agents made of proteins. They seem to damage neural tissue by causing similar proteins in the brain to assume the prion conformation. Thus they cause a disease without using either RNA or DNA to provide information for the disease process.
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The nitrogenous base that is only found in DNA and not in RNA is:
A. cytosine. B. uracil. C. adenine. D. thymine. E. guanine.
_____ are RNA molecules that can catalyze reactions like protein enzymes do
1.Initiation factors 2.Ribozymes 3.Elongation factors 4.Poly A polymerases 5.Release factors
Which is true concerning cell division?
A. During meiosis I, sister chromatids pair up and then are separated B. An asexually reproducing organism needs mitosis to produce a genetically diverse set of daughter cells in order to maintain genetic diversity C. When comparing the parent and daughter cells, meiosis differs in both the ploidy level and ploidy number, whereas mitosis differs in neither D. During crossing over, an allele for brown eyes may be switched with an allele for brown hair
Which of the following statements concerning the electron transport chain is false?
A) The final electron acceptor is oxygen. B) Each FADH2 yields two ATP molecules. C) Each NADH yields three ATP molecules. D) The electron transport chain will work whether oxygen is present or not.