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DNA Structure And Function
Test Description: DNA mitosis replication
Instructions: Answer all questions to get your test result.
1) Cells pass through a G2 checkpoint before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired. Why is DNA damage repaired before cells enter mitosis?
A
so that the chromosomes can align at the metaphase plate during mitosis
B
so that another round of DNA synthesis does not have to take place
C
so that healthy daughter cells are produced, allowing the organism to continue growing
D
so that the cytoplasm can be divided equally between the two daughter cells
2) Characteristics such as a widow's peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?
A
Nitrogenous Bases
B
Deoxyribose sugars
C
Phosphate groups
D
Hydrogen bonds
3) How does DNA in cells determine an organism's complex traits?
A
DNA separates into long single strands that make up each part of an organism
B
DNA produces the energy an organism needs in order to grow
C
DNA contains codes for proteins, which are necessary for the growth and functioning of an organism
D
DNA folds into the nucleus of each of the cells of an organism
4) The sequence of nitrogenous bases in DNA varies widely. The sequence of the bases in DNA is most important for which of the following?
A
allowing the DNA to have the shape necessary for replication
B
providing the instructions for the traits of an organism
C
preventing mutations from occurring during DNA replication
D
helping form the sugar-phosphate backbone of DNA molecules
5) Four different nucleotides are used as building blocks. Which of the following can be used to distinguish one nucleotide from another?
A
the nitrogenous base
B
the type of fatty acid
C
the shape of the deoxyribose sugar
D
the length of the phosphate group
6) Semi-conservative replication of DNA refers to the idea that
A
the two strands of DNA molecules run in opposite directions
B
each half of the original DNA molecule is joined with the new complementary DNA strand
C
each new DNA molecule contains two new single RNA strands
D
DNA molecules need to unwind before duplication occurs
7) In a sample of double-stranded DNA, 30% of the nitrogenous bases are thymine. What percentage of nitrogenous bases in the sample are adenine?
A
20%
B
70%
C
30%
D
60%
8) Where in the eukaryotic cell is DNA located?
A
cell membrane
B
cytoplasm
C
ribosome
D
nucleus
9) Between the two strands of DNA segment the nitrogen bases are held together by
A
ionic bonds
B
hydrogen bonds
C
covalent bonds
D
metallic bonds
10) According to Chargaff's rule of base pairing, which of the following is true about DNA?
A
A=C; T=G
B
A=G; T=C
C
A=T=C=G
D
A=T; C=G
*select an answer for all questions
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