Practice Questions Section 8.2:
DNA Structure
1. The four types of nucleotides that make up
DNA are named for their
A
hydrogen bonds.
B
nitrogen-containing bases.
C
phosphate groups.
D
ring-shaped sugars.
2. After examining the DNA of different
organisms, which of the following did Erwin
Chargaff conclude about the four bases?
A
B
C
D
A = T and C = G
A=C=G=T
A = C and G = T
A+T=C+G
3. Which of the following DNA sequences is
complementary to the base sequence
ACCGTAT?
A
TGGCATA
B
UCCGTAT
C
GTTACGC
D
CAATGCG
4. Combining the work of other scientists with
their own research, Watson and Crick
discovered that two strands of DNA join
together to form a(n)
A
nucleotide.
B
X in a circle.
C
double helix.
D
covalent bond.
5. What are the three parts of a nucleotide?
A
Sugar, carbohydrate, and nitrogen.
B
Atoms, molecules, and cells.
C
Sugar, nitrogen, and phosphorous.
D
Sugar, phosphate, and nitrogen base.
6. Below is a single strand of DNA. Choose the
first three nucleotides of the other DNA
strand.
C C G T A C T
A
B
C
D
GGT
CCT
GGC
TTA
7. The main difference between the four
nucleotides that make up DNA is that they
have different
A
5-carbon sugars.
B
uracil.
C
bonds.
D
nitrogen bases.
8. In humans, where does DNA replication take
place?
A
nucleus
B
ribosome
C
cytoplasm
D
vacuole
9. The image below shows a segment of a DNA
molecule. Variations in which part of the
molecule cause variations among different
organisms?
A
B
C
D
the sugars
the hydrogen bonds
the nitrogen bases
the phosphate groups