Biology - Online Test
Q1. The protein portion of an enzyme is called as
Answer : Option B
Explaination / Solution:
Apoenzyme: The polypeptide or protein part of the enzyme is called the apoenzyme and may be inactive in its original synthesized structure.
The inactive form of the apoenzyme is known as a proenzyme or zymogen.
Q2. The following pie chart shows four components of blood plasma represented from first to fourth Qtr and the correct sequence will be :
Answer : Option B
Explaination / Solution:
90-92 per cent of plasma is water and proteins contribute 6-8 per cent of it. Plasma also contains small amounts of minerals and other materials such as glucose, amino acids, lipids, etc., arealso present in the plasma.
Q3. Inheritance of skin colour in human being is an example of
Answer : Option D
Explaination / Solution:
Skin colour in human being is controlled by many genes so it is an example of polygenic inheritance.
Q4. How many step reactions are involved in glycolysis?
Answer : Option A
Explaination / Solution:
Glycolysis is a series of reactions that and extract energy from glucose by splitting it into two three-carbon molecules called pyruvates. Glycolysis is an ancient metabolic pathway, meaning that it evolved long ago, and it is found in the great majority of organisms alive today. Glycolysis has ten steps.
Q5. Masses of bacteria associated with fungal filaments to form mesh like structures is called
Answer : Option D
Explaination / Solution:
The masses of bacterium associated with fungal filaments to form mess like structure is called flocs. Flocs are used to remove organic wastes from waste water.
Q6. Oil spills prevent oxygenation of water so they are :
Answer : Option C
Explaination / Solution:
Physical pollution is the introduction of discarded materials into the environment. Physical pollution is what you might refer to as trash and is the direct result of human actions.
In other words, nature does not produce physical pollution because in natural systems, all byproducts or wastes are eventually recycled back into the environment. For example, in nature, a fallen tree will degrade and eventually return nutrients to the soil..
Oil splits over the water bodies is the result of human activities. It prevents the oxygenation of water. It is physical pollutants.
Q7. In diploid organism, gametes are produced by meiosis division but in haploid organism gametes are produced by
Answer : Option B
Explaination / Solution:
During mitosis division two daughter cells are produced having same number of chromosome. In meiosis division four daughter cells having half the number of chromosomes are produced. So, haploid organisms follow mitosis division.
Q8. Which part of the plant store food in garlic?
Answer : Option C
Explaination / Solution:
The fleshy leaves of onion and garlic store food.
Q9. Which one proceeds reformation of nuclear envelope during M-phase of cell cycle?
Answer : Option D
Explaination / Solution:
Before the completion of Mitosis reapperance of nuclear membrane takes place along with formation of nucleolus so that the cells bocemo separate enetities after cytokinesis but having same chromosome number as parent cells.
Q10. The enzyme ligase is used to
Answer : Option C
Explaination / Solution:
DNA ligase is a specific type of enzyme, a ligase, that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond. It plays a role in repairing single-strand breaks in duplex DNA in living organisms.
The enzyme ligase is used to join vector and gene of interest to form hybrid genome that can be introduced into vectors.
