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Biology Review
Test Description: More topics for review.
Instructions: Answer all questions to get your test result.
1) What are chromatids?
A
pigments that absorb the energy in sunlight
B
doubled rods of condensed chromatin
C
none of the above
D
identical strands of chromosomes
2) What forms around the chromatids during mitosis?
A
two new cells
B
two new cell walls
C
two new nuclei
D
two new chromosomes
3) Mitosis is the stage of the cell cycle during which
A
the cell's DNA is replicated.
B
the cell's nucleus divides into two new nuclei.
C
the cell has finished dividing.
D
the cell's cytoplasm divides.
4) The energy-releasing process that does not require oxygen is called
A
respiration.
B
cytokinesis.
C
fermentation.
D
photosynthesis.
5) What happens during respiration?
A
Water and carbon dioxide are converted into energy.
B
Glucose is broken down, releasing energy.
C
Oxygen is released into the air.
D
The cytoplasm divides forming two new daughter cells.
6) An organism that has two identical alleles for a trait is
A
recessive.
B
codominant.
C
homozygous.
D
heterozygous.
7) Which of these traits is controlled by a gene with multiple alleles?
A
none of the above
B
straight hairline
C
blood type
D
smile dimples
8) What controls variations in skin color among humans?
A
four alleles of a single trait
B
two alleles of a single trait
C
multiple alleles of a single gene
D
many genes
9) During DNA replication, adenine always paris with
A
thymine.
B
guanine.
C
adenine.
D
uracil.
10) What determines the genetic code?
A
the number of nitrogen bases in a DNA molecule
B
the order of nitrogen bases along a gene
C
the number of guanine and cytosine bases in a chromosome
D
none of the above
*select an answer for all questions
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