CBSE Class 12 Biology Molecular Basis Of Inheritance Worksheet Set C

Read and download free pdf of CBSE Class 12 Biology Molecular Basis Of Inheritance Worksheet Set C. Students and teachers of Class 12 Biology can get free printable Worksheets for Class 12 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 12 students should practice questions and answers given here for Biology in Grade 12 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 12 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

CBSE Class 12 Biology Molecular Basis of Inheritance (3). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

Class_12_Biology _Worksheet_4.



Important Questions for NCERT Class 12 Biology Molecular Basis of Inheritance

 

Ques. Polysome is formed by
(a) a ribosome with several subunits
(b) ribosomes attached to each other in a linear arrangement
(c) several ribosomes attached to a single mRNA
(d) many ribosomes attached to a strand of endoplasmic reticulum. 

Answer: C

 

Ques. The two sub-units of ribosome remain united at a critical ion level of
(a) magnesium (b) calcium
(c) copper (d) manganese. 

Answer: A

 

Ques. Which antibiotic inhibits interaction between tRNA and mRNA during bacterial protein synthesis?
(a) Tetracycline (b) Erythromycin
(c) Neomycin (d) Streptomycin 

Answer: C

 

Ques. Amino acid sequence, in protein synthesis is decided by the sequence of
(a) rRNA (b) tRNA
(c) mRNA (d) cDNA. 

Answer: C

 

Ques. Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used
(a) on plates with and without streptomycin
(b) on plates with minimal medium
(c) only on plates with streptomycin
(d) only on plates without streptomycin. 

Answer: C

 

Ques. Protein synthesis in an animal cell occurs
(a) only on the ribosomes present in cytosol
(b) only on ribosome attached to the nuclear envelope and endoplasmic reticulum
(c) on ribosome present in the nucleolus as well as in cytoplasm
(d) on ribosomes present in cytoplasm as well as in mitochondria. 

Answer: D

 

Ques. During translation initiation in prokaryotes, a GTP molecule is needed in
(a) formation of formyl-met-tRNA
(b) binding of 30S subunit of ribosome with mRNA
(c) association of 30S mRNA with formyl-mettRNA
(d) association of 50S subunit of ribosome with initiation complex. 

Answer: C

 

Ques. The RNA that pick up specific amino acid from amino acid pool in the cytoplasm to ribosome during protein synthesis is called
(a) rRNA (b) RNA
(c) mRNA (d) tRNA. 

Answer: D

 

Ques. Which of the following step of translation does not consume a high energy phosphate bond?
(a) Peptidyl transferase reaction
(b) Aminoacyl tRNA binding to A-site
(c) Translocation
(d) Amino acid activation 

Answer: A

 

Ques. Protein synthesis in an animal cell, takes place
(a) in the cytoplasm as well as endoplasmic reticulum
(b) only on ribose attached to nucleon
(c) only in the cytoplasm
(d) in the nucleolus as well as in the cytoplasm.

Answer: D

 

Ques. In protein synthesis, the polymerisation of amino acids involves three steps. Which one of the following is not involved in the polymerisation of protein ?
(a) Termination (b) Initiation
(c) Elongation (d) Transcription 

Answer: D

 

Ques. Because most of the amino acids are represented by more than one codon, the genetic code is
(a) overlapping (b) wobbling
(c) degenerate (d) generate. 

Answer: C

 

Ques. The process of translation is
(a) ribosome synthesis (b) protein synthesis
(c) DNA synthesis (d) RNA synthesis. 

Answer: B

 

Ques. Match the following genes of the Lac operon with their respective products.
(A) i gene (i) b-galactosidase
(B) z gene (ii) Permease
(C) a gene (iii) Repressor
(D) y gene (iv) Transacetylase
Select the correct option.
(A) (B) (C) (D)
(a) (iii) (iv) (i) (ii)
(b) (i) (iii) (ii) (iv)
(c) (iii) (i) (ii) (iv)
(d) (iii) (i) (iv) (ii)

Answer: D

 

Ques. Select the correct match.
(a) Alec Jeffreys - Streptococcus pneumoniae
(b) Alfred Hershey and - TMV Martha Chase
(c) Matthew Meselson - Pisum sativum and F. Stahl
(d) Francois Jacob and - Lac operon Jacques Monod 

Answer: D

 

Ques. All of the following are part of an operon except
(a) an operator (b) structural genes
(c) an enhancer (d) a promoter.

Answer: C

 

Ques. Which of the following is required as inducer(s) for the expression of Lac operon?
(a) Lactose (b) Lactose and galactose
(c) Glucose (d) Galactose

Answer: A

 

Ques. Gene regulation governing lactose operon of E.coli that involves the lac I gene product is
(a) negative and repressible because repressor protein prevents transcription
(b) feedback inhibition because excess of β-galactosidase can switch off transcription
(c) positive and inducible because it can be induced by lactose
(d) negative and inducible because repressor protein prevents transcription.

Answer: D

 

Ques. Which one of the following is wrongly matched?
(a) Transcription - Writing information from DNA to tRNA.
(b) Translation - Using information in mRNA to make protein.
(c) Repressor protein - Binds to operator to stop enzyme synthesis.
(d) Operon - Structural genes, operator and promoter. 

Answer: A

 

Ques. Which enzyme will be produced in a cell if there is a nonsense mutation in the lac Y gene?
(a) Transacetylase
(b) Lactose permease and transacetylase
(c) β-galactosidase
(d) Lactose permease

Answer: C


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