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Biochemistry Interview Questions & Answers - Learning Mode

Biochemistry Interview Questions & Answers - Learning Mode

Biochemistry is the branch of science that explores the chemical processes within and related to living organisms. It is a laboratory based science that brings together biology and chemistry. By using chemical knowledge and techniques, biochemists can understand and solve biological problems. Biochemistry is the application of chemistry to the study of biological processes at the cellular and molecular level. It emerged as a distinct discipline around the beginning of the 20th century when scientists combined chemistry, physiology and biology to investigate the chemistry of living systems.

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Biochemistry Interview Questions & Answers - Learning Mode
Try Biochemistry Interview Questions & Answers - Exam Mode
Question: What is Threshold energy?

Answer: The minimum amount of energy required for the reaction to takes place is called threshold energy. Source:
Question: What is the Super phosphate of lime?

Answer: Ca (H2Po4)2 caSO4. 2H2O. Super phosphate of lime is also called as Calcium super Phosphate Source:
Question: Why nitrogen cannot form penta halides?

Answer: Because of the absence of d-orbital in its valency shells Source:
Question: What is the formula of Hypo in Oxidation state of sulphur?

Answer: The formula of Sodium Thio Sulphate is Na2S2O3. H2O is called as hypo Oxidation state of Sulphur in it is +6 0r -2 Source:
Question: What is Allotropy?

Answer: Allotropy is the property of some chemical elements to exist in two or more different forms, in the same physical state. Source:
Question: What are enantimorphs and diastereomers ?

Answer: Optical Isomers of a substance that are mirror images of each other are called Enantiomers (or) Enantimorphs. Ex: d and L ? Lactic acid

Optical Isomers of a substance that are not mirror images of each other are called Diastereomers. Ex: d-Tartaric and meso ?Tartaric acids Source:
Question: What are the important sources of Phosphorus?

Answer: Sources of Phosphorous are Phosphate rocks

► Flourapatite {2Ca3 (PO4)2 CaF2}
► Phosphorite {Ca3 (PO4)2}
Question: What is the numeric relation between pyrimidine and purine bases in the DNA molecule? Is that relation valid in RNA molecules?

Answer: The DNA molecule is made of two bound polynucleotide chains that form a helical structure (the double helix). The binding of the two chains is between their nitrogen-containing bases and it always obey the following rules: adenine (A), a purine base, binds with thymine (T), a pyrimidine base, and guanine (G), a purine base, binds to cytosine (C), a pyrimidine base. Therefore in one molecule of DNA there will be same number of adenine (A) and thymine (T) and same number of cytosine (C) and guanin Source:
Question: What is Thermite mixture?

Answer: A mixture of Fe2O3 and ammonium powder in 3:1 ratio is called Thermite mixture. Source:
Question: What is the process, by which Aluminium is refined?

Answer: By Hoope?s process Source:
Question: In NH3 molecule, the bond angle decreases from 109.28 to 107.3 why does it happen.

Answer: The more repulsion between lone pair and bond pair Source:
Question: Who proposed law of mass action? What does it states?

Answer: Laws of mass action were proposed by Gulberg and Waage. The rate of chemical reaction is directly proportional to the product of the active masses of the reactants (molar concentrations of the reactants) Source:
Question: What are enzyme cofactors?

Answer: Some enzymes need other associated molecules to work. These molecules are called enzyme cofactors and they can be, for example, organic ions, like mineral salts, or organic molecules.

Inactive enzymes for not being bound to their cofactors are called apoenzymes. Active enzymes bound to their cofactors are called holoenzymes.
Question: Why FE3+ ion is more stable than Fe2+ ion is?

Answer: Because of stable, half filled 3 d5 electronic configurations in fe3+
Question: In the extraction of sodium by cartners process the by-products formed are.

Answer: Hydrogen and Oxygen Source:
Question: What are dextrorotary compounds and Levi rotary compounds?

Answer: Compounds that rotate the plane polarized light to the right are called Dextro rotatory compounds and that rotate the plane polarized light to the left are called Leavo rotatory.
Question: Sixth group elements are called as.

Answer: Chalcogens (ore forming elements) Source:
Question: Since pepsin is a gastric enzyme does it, has acid or basic optimum pH? What happen to pepsin when it passes to the duodenum?

Answer: Pepsin acts within the stomach so its optimum pH is around 2, an acid pH. When the enzyme passes to the duodenum, it meets a higher pH and its enzyme activity ends.
Question: What is the shape of molecules SF6 and IF7?

Answer: SF6 is Octahedral
IF7 is pentagonal Bipyramidal Source:
Question: What is nucleophilic addition reaction?

Answer: When the attacking species during the addition reaction is Nucleophilic, it is nucleophilic addition reaction. Ex; Acetaldehyde cynohydrin Source:

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
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