Biology Practice MCQ Page 20

Multiple Choice questions for Biology in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 2232   In RNA ,the nitrogenous base thymine of DNA is replaced by the nitrogen base
  1. Adenine
  2. Uracil.
  3. Cytosine.
  4. Guanine.
Question: 2234   It is composed of two polynucleotide chains which are coiled round each other in the form of a double helix.
  1. DNA
  2. RNA
  3. Fats
  4. None of the above.
Question: 2235   The amount of ------- is for a particular species ,as it depends upon the number of chromosomes.
  1. Proteins.
  2. DNA.
  3. RNA.
  4. Carbohydrates.
Question: 2236   It is a heredity material and contains the genetic information which is passed on from one generation to another.
  1. RNA.
  2. DNA.
  3. Chromosomes.
  4. Carbohydrates.
Question: 2238   The evidence that DNA is the genetic material came first from studies on a bacterium known as
  1. Pneumococcus.
  2. Phase.
  3. Micobacterium .
  4. None of the above.
Question: 2240   Who along with McCarty provided experimental evidence to prove that virulence of Pneumococus,which is due to its smooth outer surface ,can be transmitted to bacteria,with lost their virulence by mutation.
  1. Hershey,Chase.
  2. Chase,Avery.
  3. Avery,Meleod.
  4. Hershey,Mcleod.
Question: 2242   Ribosomal RNA alongwith------- constitute ribosomes,which are the sites of protein synthesis.
  1. Protein.
  2. Carbohydrates.
  3. Fats.
  4. Nuceleic acids.
Question: 2244   Transfer RNA pick up amino acids and transfer them to ribosomes,where they are linked to each other to form
  1. Fats.
  2. Proteins.
  3. Carbohydrates.
  4. Nucleic acids.
Question: 2248   Which RNA carries the genetic information from DNA to ribosomes,where amino acids are arranged according to the information in mRNA to form specific molecules?
  1. Transfer RNA.
  2. Messenger RNA
  3. Ribosomal RNA
  4. None of the above
Question: 2252   In a single second,how many molecules of substrate a single enzyme molecule can break down?
  1. 100,000
  2. 10,000
  3. 1000
  4. 100
Question: 2258   The substances which assist enzymes are called
  1. Enzymes.
  2. Co-enzymes.
  3. Vitamins.
  4. Lipid molecules.
Question: 2262   They substances,which assist enzymesact,are called
  1. Diastase
  2. Substrates
  3. Co-enzymes
  4. None of the above

Answers to the questions of Biology on this page

Following list gives the correct choice for the answer of the Biology mcqs.
2232 . B       2234 . A       2235 . B       2236 . B       2238 . A       2240 . C       2242 . A       2244 . B       2248 . B       2252 . A       2258 . B       2262 . B      

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