GENETICS EXAM QUESTIONS AND THEIR SOLUTIONS

GENETICS EXAM QUESTIONS AND
THEIR SOLUTIONS


What does DNA stand for?
Deoxyribonucleic acid
Segments of DNA which code for specific proteins are
called...
Genes
DNA may coil and condense into visible structures
called...
Chromosomes
How many nitrogenous bases are found in DNA?
Four
What two nitrogenous bases are purines?
Adenine and Guanine
What two nitrogenous bases are pyrimidines?
Cytosine and Thymine
Adenine always pairs with...
Thymine
Cytosine always pairs with...
Guanine
What chemical bond holds the nitrogenous base pairs
together?
Hydrogen bonds
James Watson and Francis Crick, with the help of
Rosalind Franklin, determined that DNA is in the
shape of a...
Double helix

, The shape of DNA can be compared to a twisted
ladder. The sides of the ladder would be the...
Deoxyribose sugar and phosphate
The shape of DNA can be compared to a twisted
ladder. The rungs or steps of the ladder would be
the...
Nitrogenous base pairs
What does DNA undergo before a cell divides by
mitosis or meiosis?
Replication
What enzyme "unzips" the DNA molecule?
Helicase
What enzyme builds the new DNA strands using the
original strands as templates?
DNA polymerase
Number the following steps of DNA replication in the
correct order:
____ Each half of the original DNA molecule acts as a
template
____ Enzymes form new strands using
complementary base pairing
____ An enzyme unwinds and unzips the DNA
molecule
____ The daughter strands wind together with their
parent strands forming two identical copies of DNA
In order:
1. An enzyme unwinds and unzips the DNA molecule
2. Each half of the original DNA molecule acts as a
template
3. Enzymes form new strands using complementary base
pairing