Ribosomes Multiple Choice Questions
1. Which of the following Scientist discovered ribosome for the first time?
A. George Emil Palade
B. Theodor Schwann
C. Antonie van Leeuwenhoek
D. Robert Hook
Answer: A
2. Ribosomes are made up of__________
A. DNA and protein
B. DNA alone
C. RNA and proteins
D. RNA and DNA
Answer: C
3. Sedimentation unit of ribosome is____________
A. Micron
B. Milimicron
C. Angstrom
D. Svedberg
Answer: D
4. What is the function of nucleoli?
A. Synthesize proteins
B. Synthesize ribosomes
C. Synthesize chromosomes
D. Synthesize lysosomes
Answer: B
5. Ribosome is often called____________
A. Microsome
B. RNA particles
C. Dictyosomes
D. Oxysome
Answer: B
6. Ribosomes are present in____________
A. Eukaryotes only
B. Eukaryotes and prokaryotes
C. Prokaryotes only
D. Eukaryotes, prokaryotes and viruses
Answer: B
7. Palade particles are__________
A. Ribosomes
B. Golgi vesicles
C. Lysosomes
D. Sphaerosomes
Answer: A
8. The ……………………… is a tiny granular structures and it is involved in the process of protein synthesis.
A. Nucleus
B. Chromosome
C. Chromatin
D. Ribosome
Answer: D
9. When the 50S subunit binds to the 30S subunit mRNA and it forms an active ribosome ……………………………… complex.
A. rRNA
B. mRNA
C. tRNA
D. sRNA
Answer: B
10. Which cell organelle plays a key role in translating the genetic message?
A. Nucleus
B. Mitochondria
C. Golgi Apparatus
D. Ribosomes
Answer: D
11. Which of the following ribosomal RNA does not take part in rDNA organization of E.coli?
A. 5S RNA
B. 23S RNA
C. 16S RNA
D. 5.8S RNA
Answer: D
12. The sedimentation coefficient of complete ribosomes in bacterial cells is__________
A. 70S
B. 80S
C. 78S
D. 60S
Answer: A
13. Which of the following subunits of ribosomes is composed of 23S rRNA and 5S rRNA along with 32 different proteins?
A. 50S
B. 70S
C. 30S
D. 60S
Answer: A
14. Which type of ribosome is attached to the outside of the endoplasmic reticulum?
A. Free ribosomes
B. Bound ribosomes
C. Both
D. None
Answer: B
15. The ribosomes generally composed of two subunits where one consists of protein and the other is a type of RNA called as__________
A. Ribosomal RNA
B. Ribosomal DNA
C. Ribosomal Nucleus
D. Ribosomal scurvy
Answer: A
16. What is polyribosome?
A. Association of several ribosomes on a single mRNA molecule is called a polyribosome.
B. Association of several mRNAs on a single ribosome molecule is called a polyribosome.
C. Association of several ribosomes.
D. Association of several deoxy ribosomes.
Answer: A
17. Genetic information stored in mRNA is translated to polypeptide by ___________
A. Ribosome
B. Nucleus
C. Endoplasmic reticulum
D. Golgi apparatus
Answer: A
18. Which of the following are functions of ribosomes?
(i) It helps in the manufacture of protein molecules.
(ii) It helps in manufacture of enzymes.
(iii) It helps in the manufacture of hormones.
(iv) It helps in the manufacture of starch molecules.
A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (i) and (iv)
Answer A
19. Where the free ribosomes synthesized proteins?
A. Cytoplasm
B. Centriole
C. Nucleus
D. Cytosol
Answer: D
20. What is the sedimentation coefficient of mitochondrial ribosomes of humans?
A. 70S
B. 55S
C. 80S
D. 60S
Answer: B
21. Polysome is formed by__________
A. Several ribosomes attached to a single mRNA.
B. Many ribosomes attached to a strand of the endoplasmic reticulum.
C. a ribosome with several subunits.
D. Ribosomes are attached in a linear arrangement.
Answer: A
22. Site of formation of ribosomal precursor or ribosomal subunits in a cell____________
A. Nucleus
B. Nucleolus
C. Nucleus body
D. Stroma
Answer: B
23. The ribosomes of bacteria, mitochondria, prokaryotes, and chloroplast are of____________
A. 50S type
B. 80S type
C. 70S type
D. 30S type
Answer: C
24. 70S type of ribosomes are found in___________
A. Prokaryotic cells
B. Prokaryotic cells and chloroplast
C. Mitochondria
D. Nucleus, mitochondria
Answer: B
25. Assembly of 60 S and 40 S subunits of ribosomes produce____________
A. 80 S
B. 70 S
C. 50 S
D. 100 S
Answer: A
26. The cell organelle is known as protein factory is__________
A. Lysosome
B. Ribosome
C. SER
D. Vacuole
Answer: B
27. The site of protein synthesis in plants is_____________
A. Chloroplast
B. Ribosomes
C. Lysosomes
D. Mitochondria
Answer: B
28. Ribosomes attach to the endoplasmic reticulum by their_______
A. 50’S ‘sub-unit
B. 60’S ‘sub-unit
C. 40’S ‘sub-unit
D. More than one option is correct
Answer: D
29. Ribosomes are attached to the endoplasmic reticulum through glycoproteins known as Ribophorin I and II. Which subunit of ribosomes get attached to the endoplasmic reticulum?
A. Large subunit
B. Small subunit
C. tRNA
D. mRNA
Answer: A
30. Which of these options are not a function of ribosomes?
I. It helps in manufacture of protein molecules.
II. It helps in manufacture of enzymes
III. It helps in manufacture of hormones
IV. It helps in manufacture of starch molecules
A. I and II
B. II and III
C. III and IV
D. IV and I
Answer: A
31. Choose the incorrectly matched pair from the options given below.
A. Director of the cell – Nucleus
B. Protein factories – Ribosomes
C. Semiautonomous organelle – Mitochondria
D. Cytoplasmic bridges – Nucleolus
Answer: D
32. Select the incorrect statement about prokaryotic ribosomes.
A. 50S and 30S subunits unite to form 70S ribosomes.
B. Polysomes/polyribosome consists of many ribosomes only.
C. Ribosome is the site of protein synthesis.
D. Polysomes indicate the synthesis of identical polypeptide in multiple copies.
Answer: B
33. Majority of proteins ( of intracellular use ) are not synthesized on_____________
A -Ribosomes produced in the nucleolus
B – Ribosomes attached with ER and nuclear membrane
C – Free ribosomes of eukaryote cells
D – Ribosomal sub- units forming polyribosomes
E – Ribosomal sub- units forming polyribosomes Which are found in peri-mitochondrial space of prokaryotic cells
A. A and D
B. B,C and D
C. D and E
D. B , C and E
Answer: A
34. Study the following statements. The correct statements are_______
(I) the diameter of ribosomes is `230A^0`
(II) eukaryotes and Prokaryotes have both 80 S and 70 S ribosomes
(III) 80 S ribosomes are formed by association between 50 S and 30 S sub units
(IV) Polyribosomes translate and produce different polypeptides
A. I only
B. I and III only
C. I, II and III only
D. II and IV
Answer: A
35. Which of the following statement is incorrect w.r.t ribosomes?
A. The type of ribosomes of prokaryotes is 70S
B. Ribosomes were descoverd by George Palade
C. They are made up of RNA only
D. Ribosome are also known as protein factories
Answer: C
36. What is true about ribosomes?
A. The prokaryotic ribosomes are where ‘S’ stands for sedimentation coefficient
B. These are composed of ribonucleic acid and proteins
C. These are found only in eukaryotic cells
D. These are self-splicing introns of some RNAs
Answer: B