set 4 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 5 EXERCISES
The following question based on genetics, evolution of life & ecological biodiversity topic of general science mcq
List-I | List-II |
A. Theory of mutation | 1. Beadle and Tatum |
B. Theory of evolution | 2. Jacob and Monod |
C. One gene one enzyme hypothesis | 3. Darwin |
D. Operon concept | 4. Hugo De Vries |
(a) 4 3 2 1
(b) 3 4 1 2
(c) 4 3 1 2
(d) 3 4 2 1
The correct answers to the above question in:
Answer: (c)
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Read more genetics evolution of life and ecological biodiversity Based General Science Questions and Answers
Question : 1
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
a) Uracil, Cytosine - Pyrimidines
b) Guanine, Adenine - Purines
c) Thymine, Uracil - Pyrimidines
d) Adenine, Thymine - Purines
Answer »Answer: (d)
Purine is an organic nitrogenous base sparingly soluble in water, that gives rise to a group of biologically important derivatives, notably adenine and guanine, which occur in nucleotides and nucleic acids (DNA and RNA).
Question : 2
Modern man evolved from
a) Neanderthal man
b) Java man
c) Peking man
d) cro-magnon man
Answer »Answer: (d)
Question : 3
Which of the following group of animals maintains high and constant body temperature such as mammals ?
a) Birds
b) Reptiles
c) Amphibians
d) Fishes
Answer »Answer: (a)
Animals which maintain high and constant body temperature are called warm blooded animals. They are also called homeothermic animals. Birds are the first vertebrate to have warm blood. They are homeothermous.
Question : 4
The first organisms were
a) Chemoheterotrophs
b) Autotrophs
c) Chemoautotrophs
d) Eukaryotes
Answer »Answer: (a)
Chemoheterotrophs were first organisms. They were prokaryotic like bacteria, anaerobes, as molecular oxygen was absent. They obtained energy by fermentation of some of the organic molecules present in the broth. Thus they absorbed organic molecules from outside for body building and energy.
Chemoautotrophs - Organisms that are capable to synthesize organic molecules from inorganic molecules. E.g., Nitrifying bacteria, sulphur reducing bacteria etc.
Autotrophs are photosynthesizing plants / organisms.
Question : 5
Which of the following viruses have RNA as the genetic material?
- Polio-viruses
- Retroviruses
- Adeno-viruses
- TMV
a) 2, 3 and 4
b) 1, 2 and 4
c) 1, 2 3 and 4
d) 3 and 4
Answer »Answer: (b)
Adenoviruses are medium-sized (90–100 nm), nonenveloped viruses with an icosahedral nucleocapsid containing a double stranded DNA genome.
Question : 6
Consider the following statements :
- Genomics is the study of the sequencing the genomes of organisms.
- Genomics includes intensive efforts to determine the entire DNA sequence of organisms and fine scale genetic mapping efforts.
- Genomics was established by Fredrick Sangerwhen he first sequenced the complete genomes of a virus and a mitochondrion.
a) 1 and 3
b) 2 and 3
c) 1 and 2
d) 1, 2 and 3
Answer »Answer: (d)
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