Biol 4003 (questions and answers)
graded A+
Which of the following is not one of the four criteria that the genetic material must fulfill to
function as the genetic material?
A. Store information
B. Replication
C. DNA repair
D. Transmission - ANS ✔✔C. DNA repair
Which component(s) of a nucleotide is/are found along the DNA backbone?
A. bases
B. deoxyribose and bases
C. phosphate
D. deoxyribose and phosphate - ANS ✔✔D. deoxyribose and phosphate
3. Which of the following could be the components of a single nucleotide found within a DNA
strand?
A. ribose, thymine, and phosphate
B. deoxyribose, uracil, and phosphate
C. deoxyribose, thymine, and phosphate
D. deoxyribose, guanine, and three phosphates - ANS ✔✔C. deoxyribose, thymine, and
phosphate
4. Which of the following bases is not found in RNA?
A. thymine
, B. guanine
C. cytosine
D. uracil - ANS ✔✔A. thymine
Chargaff's results suggests that (in DNA),
A. the amount of G = C and A = T.
B. the amount of G = A = C = T.
C. the amount of G = T and A = C.
D. all of the above. - ANS ✔✔A. the amount of G = C and A = T.
In a DNA strand, a phosphate connects a 3' carbon atom in one deoxyribose to
A. a 5' carbon in an adjacent deoxyribose.
B. a 3' carbon in an adjacent deoxyribose.
C. a base in an adjacent nucleotide
D. none of the above. - ANS ✔✔A. a 5' carbon in an adjacent deoxyribose.
Two circular DNA molecules are topoisomers of each other; they contain the same amount of
DNA. Let's call them DNA-1 and DNA-2. Under the electron microscope, DNA-1 appears more
compact compared to DNA-2. The level of gene transcription is much lower for DNA-2. Which of
the following three possibilities would best explain these observations?
A. DNA-1 has 4 negative supercoils and DNA-2 has 2 positive supercoils.
B. DNA-1 has 4 positive supercoils and DNA-2 has 2 negative supercoils.
C. DNA-1 has 2 positive supercoils and DNA-2 has 4 negative supercoils.
D. DNA-1 has 2 positive supercoils and DNA-2 has 2 negative supercoils. - ANS ✔✔A. DNA-1 has
4 negative supercoils and DNA-2 has 2 positive supercoils.
When two closely related species (like two salamanders) differ greatly in their total amount of
DNA, this is usually due to
graded A+
Which of the following is not one of the four criteria that the genetic material must fulfill to
function as the genetic material?
A. Store information
B. Replication
C. DNA repair
D. Transmission - ANS ✔✔C. DNA repair
Which component(s) of a nucleotide is/are found along the DNA backbone?
A. bases
B. deoxyribose and bases
C. phosphate
D. deoxyribose and phosphate - ANS ✔✔D. deoxyribose and phosphate
3. Which of the following could be the components of a single nucleotide found within a DNA
strand?
A. ribose, thymine, and phosphate
B. deoxyribose, uracil, and phosphate
C. deoxyribose, thymine, and phosphate
D. deoxyribose, guanine, and three phosphates - ANS ✔✔C. deoxyribose, thymine, and
phosphate
4. Which of the following bases is not found in RNA?
A. thymine
, B. guanine
C. cytosine
D. uracil - ANS ✔✔A. thymine
Chargaff's results suggests that (in DNA),
A. the amount of G = C and A = T.
B. the amount of G = A = C = T.
C. the amount of G = T and A = C.
D. all of the above. - ANS ✔✔A. the amount of G = C and A = T.
In a DNA strand, a phosphate connects a 3' carbon atom in one deoxyribose to
A. a 5' carbon in an adjacent deoxyribose.
B. a 3' carbon in an adjacent deoxyribose.
C. a base in an adjacent nucleotide
D. none of the above. - ANS ✔✔A. a 5' carbon in an adjacent deoxyribose.
Two circular DNA molecules are topoisomers of each other; they contain the same amount of
DNA. Let's call them DNA-1 and DNA-2. Under the electron microscope, DNA-1 appears more
compact compared to DNA-2. The level of gene transcription is much lower for DNA-2. Which of
the following three possibilities would best explain these observations?
A. DNA-1 has 4 negative supercoils and DNA-2 has 2 positive supercoils.
B. DNA-1 has 4 positive supercoils and DNA-2 has 2 negative supercoils.
C. DNA-1 has 2 positive supercoils and DNA-2 has 4 negative supercoils.
D. DNA-1 has 2 positive supercoils and DNA-2 has 2 negative supercoils. - ANS ✔✔A. DNA-1 has
4 negative supercoils and DNA-2 has 2 positive supercoils.
When two closely related species (like two salamanders) differ greatly in their total amount of
DNA, this is usually due to
