BIO 210 FINAL EXAM WITH
CORRECT ANSWERS 2026/2027
GRADED A+
In a double-stranded DNA molecule, which of the following base
ratios always equal 1?
A. (A+T)/(G+C)
B. C/G
C. (A+G)/(C+T)
D. (G+T)/(A+C) -ANS:B, C, and D
What does it mean to say that double-stranded nucleic acids are
antiparallel? -ANS:It means that one strand is going "up" (3' to 5')
while the other is going "down" (5' to 3')
How many rings do purines have? -ANS:two
What holds the two sides of the DNA helix together? -ANS:hydrogen
bond
, In a strand of DNA, the percentage of thymine is 30%. What is the
percentage of cytosine? Adenine? Guanine? -ANS:Cytosine: 20%
Adenine: 30%
Guanine: 20%
Griffith's Transformation Experiment -ANS:- concluded that R-strain
bacteria must have taken up what he called a "transforming
principle" from the heat-killed S bacteria, which allowed them to
"transform" into smooth-coated bacteria and become virulent
Avery, MacLeod, McCarty Experiments -ANS:- showed that DNA (not
proteins) can transform the properties of cells, clarifying the
chemical nature of genes
Hershey and Chase Experiment -ANS:- concluded that when
bacteriophages, which are composed of DNA and protein, infect
bacteria, their DNA enters the host bacterial cell, but most of their
protein does not
What were the order of the experiments that determined the
presence of genetic material in DNA? -ANS:1. Griffith
2. Avery, MacLeod, McCarty
3. Hershey and Chase
CORRECT ANSWERS 2026/2027
GRADED A+
In a double-stranded DNA molecule, which of the following base
ratios always equal 1?
A. (A+T)/(G+C)
B. C/G
C. (A+G)/(C+T)
D. (G+T)/(A+C) -ANS:B, C, and D
What does it mean to say that double-stranded nucleic acids are
antiparallel? -ANS:It means that one strand is going "up" (3' to 5')
while the other is going "down" (5' to 3')
How many rings do purines have? -ANS:two
What holds the two sides of the DNA helix together? -ANS:hydrogen
bond
, In a strand of DNA, the percentage of thymine is 30%. What is the
percentage of cytosine? Adenine? Guanine? -ANS:Cytosine: 20%
Adenine: 30%
Guanine: 20%
Griffith's Transformation Experiment -ANS:- concluded that R-strain
bacteria must have taken up what he called a "transforming
principle" from the heat-killed S bacteria, which allowed them to
"transform" into smooth-coated bacteria and become virulent
Avery, MacLeod, McCarty Experiments -ANS:- showed that DNA (not
proteins) can transform the properties of cells, clarifying the
chemical nature of genes
Hershey and Chase Experiment -ANS:- concluded that when
bacteriophages, which are composed of DNA and protein, infect
bacteria, their DNA enters the host bacterial cell, but most of their
protein does not
What were the order of the experiments that determined the
presence of genetic material in DNA? -ANS:1. Griffith
2. Avery, MacLeod, McCarty
3. Hershey and Chase
