Biology Practice Exam Quiz MCQ!
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- 1.Chromatids are
- A.
Dense patches within the nucleus
- B.
Bacterial chromosomes
- C.
Duplicate halves of a chromosome
- D.
Prokaryotic nuclei
- 2.
![Which is the correct sequence of the cell cycle? - ProProfs]( "Which is the correct sequence of the cell cycle?")
Which is the correct sequence of the cell cycle?- A.
C -> M -> G1 -> S -> G2
- B.
S -> G1 -> G2 -> M -> C
- C.
G1 -> S -> G2 -> M -> C
- D.
None
- 3.Chromosomes are only visible in what stage?
- A.
M phase (meiosis)
- B.
G1
- C.
G2
- D.
C phase
- E.
S phase (DNA synthesis)
- 4.Crossing-over occurs during:
- A.
Mitosis
- B.
Prophase I of meiosis
- C.
Metaphase I of meiosis
- D.
None
- 5.Crossing-over is also known as:
- A.
Synapsis
- B.
Chiasmata
- 6.Synapsis is:
- A.
Crossing-over
- B.
The lining up of chromosomes
- C.
Chromosomes lying close together
- 7.In what phase do tetrads form?
- A.
Anaphase I
- B.
Metaphase I
- C.
Prophase I
- D.
Metaphase II
- E.
Prophase II
- 8.The cell cycle is
- A.
Series of events that cells go through as they grow and divide
- B.
Period of time between the birth and death of a cell
- C.
Time from prophase until cytokinesis
- D.
Time is takes for a cell to undergo mitosis
- 9.What is the role of the spindle during mitosis?
- A.
It helps separate the chromosomes
- B.
It breaks down the nuclear membrane
- C.
It duplicates the DNA
- D.
It divides the cell in half
- 10.Unlike mitosis, meiosis results in the formation of:
- A.
2 genetically identical cells
- B.
4 genetically identical cells
- C.
2 genetically different cells
- D.
4 genetically different cells
- 11.Genetic drift tends to occur in populations that are:
- A.
Small
- B.
Large
- 12.During transcription:
- A.
Proteins are synthesized
- B.
DNA is replicated
- C.
RNA is produced
- D.
Translation occurs
- 13.What type of gene codes for a repressor protein?
- A.
Regulator
- B.
Promoter
- C.
Operon
- D.
Enhancer
- 14.Which enzyme's action is prevented by the presence of a repressor protein?
- A.
DNA polymerase
- B.
RNA polymerase
- C.
Lactase
- D.
Permease
- 15.The lac operon shuts off when:
- A.
Lactose is present
- B.
Lactose is absent
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