Biology Practice Exam Quiz MCQ!

15 Questions | By Kchusid | Last updated: Dec 28, 2020 | Total Attempts: 480

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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?
- 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