Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

For the redox reaction:


          $Zn+N{ O }^- _3\rightarrow Zn^{2+}+NH^+ _4$ 

in a basic medium, coefficients of $Zn, \ NO^- _3$ and $OH^-$ in the balanced equation respectively are:

  1. $4, 1, 7$
  2. $7, 4, 1$
  3. $4, 1, 10$
  4. $1, 4, 10$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Balancing the redox reaction Zn + NO3- -> Zn2+ + NH4+ in basic medium involves balancing electrons and charge. The balanced equation is 4Zn + NO3- + 7H2O -> 4Zn2+ + NH4+ + 10OH-. Thus, the coefficients are 4, 1, and 10.

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

The mass of $H _{2}O _{2}$ that is completely oxidised by $30.2\ g$ of $KMnO _{4}$ (molar mass= $158\ g mol^{-1}$) in acidic medium is 

  1. $12\ g$
  2. $14\ g$
  3. $16\ g$
  4. $1\ g$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In acidic medium, 2 moles of KMnO4 react with 5 moles of H2O2. Calculating moles of KMnO4 (30.2g / 158g/mol = 0.191 mol), the required moles of H2O2 is (5/2) * 0.191 = 0.4775 mol. Mass = 0.4775 * 34g/mol = 16.2g, which rounds to 16g.

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

Which of the following is a non - redox process ?

  1. $ SO _{4}^{2-}\rightarrow SO _{3} $
  2. $ Cr _{2}O _{7}^{2-}\rightarrow CrO _{4}^{2-} $
  3. $ PO _{4}^{3-}\rightarrow P _{2}O _{7}^{4-} $
  4. $ C _{2}O _{4}^{-2}\rightarrow CO _{2} $
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

In Redox reaction oxidation state changes  


(a) In $ SO _{4}^{-2}, $ Its $ S^{+6} $
In $ SO _{3}, $ Its $ S^{+6}$
$ \therefore$ In $SO _{4}^{-2}\rightarrow SO _{3},$ there is no change 
in oxidation state of $ O^{+5}$
$ \therefore $ Non- redox reaction 

(b) In $ Cr _{2}O _{7}^{-2} $
Lets oxidation state of Cr be x 
$ \therefore 2(x)+7(-2) = -2 $
$ \therefore 2x+(-14) = -2 $
$ \therefore 2x = 12 $
$ \therefore x = 16 $

In $ CrO _{4}^{-2} $ 

Let oxidation Sate of Cr be y
$ y+4(-2) = -2 $
$ y-8 = -2 $
$ y = +6 $
$ \therefore $ oxidation of Cr remain same 
$ \therefore $ Non- redox Readtion

(C) In $ PO _{4}^{-3}, $ Its $ P^{+} $
and In $ P _{2}O _{7}^{-4} $
Let oxidation sate of P be x 
$ 2x+7(-2) = -4 $
$ 2x-14 = -4 $
$ \therefore 2x = 10 $  $ \therefore $ Non - redox Reaction 
$ \therefore x = 5 $

(d) In $ C _{2}O _{4}^{-2},$ Its $ C^{+3}$
In $ Co _{2},$ Its $ C^{+4} $  $ \therefore $ Redox reaction 

Hence, the correct options are $\text{A}$, $\text{B}$ and $\text {C}$

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Water we take in, plays an important role in?

  1. Metabolic processes

  2. Provide energy

  3. Prevents dehydration

  4. More than one correct answer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water is the medium for all metabolic processes in living organisms, acting as a solvent for biochemical reactions. While it helps prevent dehydration, its primary biological role is facilitating the chemical reactions that sustain life.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Which of the following represents the metabolic anti-transparent?

  1. PMA
  2. $CO _2$

  3. Aspirin

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PMA (phorbol myristate acetate) acts as a metabolic activator or tumor promoter, stimulating various cellular processes. It is often described as 'anti-transparent' in the sense of being a metabolic stimulant. CO2 and aspirin have different primary roles in metabolism.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Which of the following life processes is evolved around RNA?

  1. Metabolism

  2. Translation

  3. Splicing

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

RNA plays a central role in various life processes, including the synthesis of proteins (translation), the processing of pre-mRNA (splicing), and various regulatory metabolic functions. Therefore, all listed processes involve RNA.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Respiration is a

  1. Anabolic process

  2. Deamination process

  3. Catabolic process

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The breaking of the C-C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called as respiration. As carbon-carbon covalent bonds are broken, it is a catabolic process. Respiration involves the synthesis of energy in form of ATP. The synthesis of ATP leads to the formation of several covalent linkages of phosphates. There is synthesis which are included in the anabolic processes.

Thus, the correct answer is option D.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Catabolic and anabolic pathways are often coupled in cell because

  1. Both the paths have the same energy

  2. The free energy released from one pathway is used to drive other

  3. The intermediates of a catabolic pathway are used in the anabolic pathway

  4. Their enzymes are controlled by their activators and inhibitors.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Anabolic pathways are those that require energy to synthesize larger molecules. Catabolic pathways are those that generate energy by breaking down larger molecules. Both types of pathways are required for maintaining the cell's energy balance.
  • Catabolic and anabolic pathway are coupled because catabolic reactions furnish the energy required for anabolism. Catabolic reactions transfer energy from complex molecules to ATP. Anabolic reactions transfer energy from ATP to complex molecules.
  • Hence Catabolic and anabolic pathways are often coupled in the cell because the free energy released from one pathway is used to drive other.
  • So, the correct answer is 'the free energy released from one pathway is used to drive other'.
Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Muscle tissue growth : anabolic process : : .......... : catabolic process.

  1. Digestion

  2. Secretion

  3. Regulation

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Muscle tissue growth is an anabolic process. There is respiration reactions carried out in the muscles which provide energy in the form of ATP. This liberated energy helps the muscles to relax and contract. Thus, the muscles tissue show growth due to anabolic process. 

The process of digestion is considered as the catabolic process. There is break down of the complex food into simpler compounds. These simpler molecules can be easily absorbed by the cells of the body. 
Thus, the correct answer is option A. 

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Conversion of polysaccharide to monosaccharide is known as

  1. Anabolic reaction

  2. Catabolic reaction

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The catabolic processes are the reactions in which the large complex molecules are broken down to produce smaller organic molecules. The polysaccharide which is a complex molecule is broken down to from many small monosaccharide molecules. For example, glycogen is broken down to produce glucose molecules. 

Thus, the correct answer is option B.