Free Cell Structure and Function MCQs with Answers
2,478 Cell Structure and Function MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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Read the Cell Structure and Function notesFree MDCAT chapter notes with key terms2,478 questions · page 32 of 124
- A. Crossing Over
- B. Attachment
- C. Pairing
- D. Leptotene
Explanation: Chiasmata are the X-shaped structure formed due to the point of contact between paired chromatids during meiosis.
Correct answer: Crossing Over622. In which stage of Interphase, there is an increase in cell size and many biochemical are formed:
- A. G2 phase
- B. G1 phase
- C. S phase
- D. C phase
Explanation: As the cell grows and expands after cell division, that is the point when the nucleus is most active, i.e.
Correct answer: G1 phase- A. Mutation
- B. Controlled cell division
- C. Regulated mitosis
- D. Haploid division
Explanation: Cancer is caused by changes (mutations) to the DNA within cells. The DNA inside a cell is packaged into a large number of individual…
Correct answer: Mutation- A. Segregation
- B. Independent assortment
- C. Crossing over
- D. Mutation
Explanation: During prophase I, non-sister chromatids of homologous chromosomes undergo crossing over and exchange of genetic material takes place.
Correct answer: Crossing over- A. G1
- B. G2
- C. S
- D. G0
Explanation: The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of…
Correct answer: S- A. Prophase
- B. Metaphase
- C. Anaphase
- D. Telophase
Explanation: During cell division, most sensitive phase is that in which spindle fibers contract and chromosomes move away from one another to opposite…
Correct answer: Anaphase- A. Prophase I
- B. Telophase I
- C. Metaphase I
- D. Anaphase I
Explanation: Meiosis consists of two divisions, both of which follow the same stages as mitosis (prophase, metaphase, anaphase, telophase).
Correct answer: Prophase I628. During the G2 phase:
- A. Chromosome number is duplicated
- B. The chromosomes are left with only one chromatid
- C. Energy is stored for chromosome movement and mitotic specific proteins (Tubulin) are produced
- D. Specific enzymes are synthesized and DNA base units are accumulated
Explanation: Option A occurs during the S phase, where DNA is replicated.Option B occurs after the M phase, when the cell has divided.Option C is 'G2'…
Correct answer: Energy is stored for chromosome movement and mitotic specific proteins (Tubulin) are produced- A. G1
- B. M
- C. G2
- D. S
Explanation: Microtubule subunits are tubulin proteins, which are formed prior to the initiation of mitosis.
Correct answer: G2- A. Period of growth
- B. Replication of DNA
- C. Followed by cell division
- D. Followed by nuclear mitosis
Explanation: The cell undergoes a sequence of changes, which involves period of growth, replication of DNA, followed by cell division.
Correct answer: Followed by nuclear mitosis- A. Inter
- B. Mitotic
- C. Meiotic
- D. Post mitotic
Explanation: It comprises two phases viz., interphase which is the period of non-apparent division and the period of division also known as mitotic…
Correct answer: Inter- A. Interphase
- B. Mitotic phase
- C. Meiotic phase
- D. Post mitotic phase
Explanation: The period of life cycle of cell (cell cycle) between two consecutive divisions is termed as the interphase or misleadingly called resting…
Correct answer: Interphase- A. G1
- B. G2
- C. S
- D. Go
Explanation: G1 (Gap 1) is the period of extensive metabolic activity, in which cell normally grows in size, specific enzymes, are synthesized and DNA…
Correct answer: G1- A. Interphase
- B. Mitotic phase
- C. G1 phase
- D. S phase
Explanation: The period of life cycle of cell (cell cycle) between two consecutive division is termed as the interphase or misleadingly called resting…
Correct answer: Interphase- A. GI phase
- B. G2 phase
- C. Go phase
- D. S phase
Explanation: G1 (Gap 1) is the period of extensive metabolic activity, in which cell normally grows in size, specific enzymes, are synthesized and DNA…
Correct answer: GI phase- A. G1
- B. S
- C. G2
- D. G0
Explanation: The phase of cell cycle during which the DNA is synthesized is called synthesizes phase.
Correct answer: S- A. 24 hours
- B. 1.5 hours
- C. 12 hours
- D. 5 hours
Explanation: Length of each phase is variable. In the case of human cell, average cell cycle is about 24 hours, mitosis takes 30 minutes.
Correct answer: 24 hours- A. 30
- B. 60
- C. 90
- D. 150
Explanation: Whereas full cycle in yeast cells is only 90 minutes
Correct answer: 90- A. Centromere of the chromosome
- B. Kinetochore of the chromosome
- C. Telomere of the chromosome
- D. Tip of the chromosome
Explanation: Spindle fibers attach on to kinetochore of the chromosome.
Correct answer: Kinetochore of the chromosome- A. Zygotene
- B. Diplotene
- C. Pachytene
- D. Leptotene
Explanation: During zygotene or zygonema of meiotic prophase I, the chromosomes become shorter and thicker.
Correct answer: Zygotene