All Free Biology MCQs with Answers
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19844 questions · page 673 of 1985
6721. Which of the following is not the function of cell membrane?
- A. Protection of cytoplasm
- B. Regulating the passage of different molecules
- C. Protein synthesis
- D. Cellular communication
- E. Cellular transportation
Explanation: Protein synthesis is the function of ribosomes.
Correct answer: Protein synthesis6722. When plant cell receives a signal for death, it commits suicide by rupturing:
- A. Nucleus
- B. Cell membrane
- C. Tonoplast
- D. Chloroplast
Explanation: Tonoplast is the membrane of vacuole found in the center of plant cell, when its membrane breaks, the cell ultimately shrinks or ruptured.
Correct answer: Tonoplast6723. An enzyme that is attached to cell membrane of cell:
- A. Adenylate cyclase
- B. Cytochrome oxidase
- C. Succinate dehydrogenase
- D. Glucokinase
Explanation: This enzyme is attached with cell membrane of cell and it converts ATP into cyclic AMP.
Correct answer: Adenylate cyclase6724. Which of the following is not associated with both prokaryotic and eukaryotic cell membrane?
- A. Receptors
- B. Enzymes
- C. DNA replication
- D. Antigens
Explanation: Receptors, enzymes and antigens all are found in both prokaryotic and eukaryotic cell meinbrane. However, only prokaryotic cell membrane is associated with DNA replication.
Correct answer: DNA replication6725. Peripheral parts of the cell are often like:
- A. Sol
- B. Gel
- C. Solid
- D. None of these
Explanation: Consistency of cytoplasm is both like sol and gel, but peripheral part is more gel like while central is sol like.
Correct answer: Gel6726. It is false about cytoplasm of eukaryotic cell:
- A. Glycolysis
- B. Transcription
- C. Site of glycogen storage
- D. Translation
Explanation: Cytoplasm is a site for many important biochemical reactions such as glycolysis, protein synthesis etc. in both prokaryotic and eukaryotic cells. Transcription in eukaryotic cell takes place in nucleus.
Correct answer: Transcription6727. 40S is the smaller ribosomal sub-unit, associated with_.
- A. E. coli
- B. Yeast
- C. C. botulinum
- D. T. pallidum
Explanation: E. coli. C. botulinum and T. pallidum are prokaryotic organisins having 30S smaller ribosomal subunit, while yeast is eukaryotic organism having 40S smaller ribosomal subunit and 60S larger sub-unit.
Correct answer: Yeast6728. The cytoplasmic organelle commonly found both in prokaryotes and eukaryotes is:
- A. Flagellum
- B. Ribosome
- C. Mitochondria
- D. Nucleoid
Explanation: Presence of ribosomes is one of the common features between prokaryotic and eukaryotic cells.
Correct answer: Ribosome6729. 70S sized ribosomes are found in the cells of:
- A. Algae
- B. Protozoans
- C. Fungi
- D. Bacteria
Explanation: There are two types of ribosomes in living world. Smaller is 70S that is present in prokaryotes.
Correct answer: Bacteria6730. Which of the following is true about cytoplasm?
- A. It can exist only in gel form
- B. It is the region between nucleus and cell membrane
- C. 70% of the cytoplasm is water
- D. Both prokaryotes and eukaryotes show cyclosis.
Explanation: Cytoplasm is the region between nucleus and cell membrane. It has both cytosol and cytogel. About 90% of cytoplasm is water. Cyclosis is a feature of eukaryotic cells.
Correct answer: It is the region between nucleus and cell membrane