Question
The nitrogenous base, adenine, is found in which three of the following
A. Proteins, chlorophyll, and vitamin A
B. Protein, ATP, and DNA
C. ATP, DNA, and RNA
D. Chlorophyll, ATP, and DNA
E. Proteins, carbohydrates, and ATP
Answer/Explanation
Ans:C
Question
Used to carry the genetic code
(A) Proteins
(B) Carbohydrates
(C) Nucleic acids
(D) Lipids
(E) Steroids
Answer/Explanation
Ans:C
Question
In the 1940’s, Avery, MacCleod, and McCarty transformed nonencapsulated bacteria into encapsulated forms by growing the nonencapsulated cells in a culture containing an extract made from dead encapsulated cells. The transformed cells produced colonies of encapsulated bacteria. Three different procedures and their results are outlined below.
Procedure I: Extract made from dead encapsulated cells added to culture medium. Nonencapsulated bacteria added to culture medium. Results: Both nonencapsulated and encapsulated bacteria grow.
Procedure II: Extract made from dead encapsulated cells treated with protein-degrading enzymes before adding extract to culture medium. Nonencapsulated bacteria added to culture medium. Results: Both nonencapsulated and encapsulated bacteria grow.
Procedure III: Extract made from dead encapsulated cells treated with DNAse (an enzyme that selectively destroys DNA) before adding extract to culture medium. Nonencapsulated bacteria added to culture medium. Results: Only nonencapsulated bacteria grow.
Question
A reasonable conclusion to draw from the results of the experiment is that
(A) DNA is the genetic material
(B) DNA replication is semiconservative
(C) DNA is a double helix
(E) mutation is a change in the genetic material
Answer/Explanation
Ans:A