Redox Reactions

Q. A biological redox reaction always involves:

1. All of the above.
2. loss and gain of electrons in different chemical species.
3. an oxidizing agent.
4. a reducing agent.

Q. Redox reactions involves exchange of

1. neutrons between species
2. electrons between species
3. protons between species
4. neurons between species

Q. Redox reaction in living organisms involves gain and loss of

1. hydrogen atoms
2. 1. oxygen atoms
3. carbon atoms
4. nitrogen atoms

Q.

Reduction is the process of the addition of hydrogen to a substance.

1. True
2. False

Q. Redox reaction in living organisms involves gain and loss of

1. carbon atoms
2. nitrogen atoms
3. hydrogen atoms
4. 1. oxygen atoms

Q. Which among the following statements is correct about nicotinamide adenine dinucleotide?

1. ${\mathrm{NAD}}^{+}$, an oxidizing agent, can accept electrons and protons from organic molecules and get reduced to $\mathrm{NADH}$
2. ${\mathrm{NAD}}^{+}$, a reducing agent, can donate its electrons and protons to organic molecules
3. ${\mathrm{NAD}}^{+}$, an oxidizing agent, can accept electrons from organic molecules and get reduced to ${\mathrm{NADH}}_2$
4. ${\mathrm{NAD}}^{+}$, a reducing agent, can donate its electrons and protons to inorganic molecules

Q. A biological redox reaction always involves:

1. loss and gain of electrons in different chemical species.
2. an oxidizing agent.
3. a reducing agent.
4. All of the above.

Q. Which among the following statements is correct about nicotinamide adenine dinucleotide?

1. ${\mathrm{NAD}}^{+}$, an oxidizing agent, can accept electrons and protons from organic molecules and get reduced to $\mathrm{NADH}$
2. ${\mathrm{NAD}}^{+}$, a reducing agent, can donate its electrons and protons to organic molecules
3. ${\mathrm{NAD}}^{+}$, an oxidizing agent, can accept electrons from organic molecules and get reduced to ${\mathrm{NADH}}_2$
4. ${\mathrm{NAD}}^{+}$, a reducing agent, can donate its electrons and protons to inorganic molecules

Q. Histidine is converted to histamine by___________.

1. Decarboxylation
2. Transamination
3. Deamination
4. None of the above

Q. Redox reactions involves exchange of

1. electrons between species
2. protons between species
3. neutrons between species
4. neurons between species

Q. L-glutamic acid undergoes deamination in the presence of

1. Glutamic acid dehydrogenase
2. NAD+
3. ATP
4. Both A and B

Q. Which of the following chemical is used for dehydration during cytological methods?

1. Formalin
2. Ethyl alcohol
3. Butyl alcohol
4. None of the above

Q. The inhibitory effect of malonic acid on succinic dehydrogenase enzyme is

1. Competitive inhibition
2. Non-competitive inhibition
3. Feedback inhibition
4. Inhibition due to end product

Q. The average cup of tea contains ........ mg of caffeine.

1. 40
2. 100
3. 30
4. 60

Q. How many redox equivalents are removed from one molecule of
3-phosphoglyceraldehyde during glycolysis?

1. 1
2. 2
3. 3
4. 4

Q.

The removal of hydrogen from a substance is called_______(oxidation/reduction)