Fate of Ammonia

Q.

Which of the following is not a pyrimidine nitrogen base?

1. Thymine

2. Cytosine

3. Uracil

4. Guanine

Q. Transamination involves the transfer of from one amino acid to the of a keto acid ​​​.

1. amino group
2. keto group
3. nitrogen
4. nitrate

Q. In plants, ammonia is used to synthesise amino acids by

1. reductive amination
2. transamination
3. ammonification
4. ammonia fixation

Q. Identify the incorrect statement related to the fate of ammonia.

1. Plants accumulate nitrogen in the form of ammonium

2. Glutamic acid formed due to reductive amination undergo transamination

3. NH₃ is protonated to form NH4

4. NH₄⁺ ion formed used for reductive amination

Q. The process of conversion of ammonia to nitrite by microbes is called

1. nitrogen-fixation
2. oxidation
3. nitrification
4. denitrification

Q. Some bacteria such as ‘X’ and ‘Y’ occur in soil which reduce nitrate to nitrogen by the process of ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’.

1. ‘X’-Nitrobacter, ‘Y’-Nitrococcus, ‘Z’-Ammonification
2. ‘X’-Nitrosomonas, ‘Y’-Thiobacillus, ‘Z’-Ammonification
3. ‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’-Nitrification
4. ‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’- Denitrification

Q.

Which of the following is a nitrifying bacteria?

1. Nitrosomonas and Nitrobacter

2. Nitrosomonas and Pseudomonas

3. Nitrobacter and Pseudomonas

4. Nitrobacter and Lactobacillus

Q.

What happens to ammonia in reductive amination?

Q.

How is ethylene produced in plants?

Q. Transamination involves the transfer of from one amino acid to the of a keto acid ​​​.

1. amino group
2. keto group
3. nitrogen
4. nitrate

Q. Nitrifying bacteria convert

1. Nitrate to Nitrogen
   
2. Ammonia to nitrogen
3. Ammonia to nitrate
4. Nitrogen into soluble form

Q. The process of conversion of ammonia to nitrite by microbes is called

1. nitrification
2. nitrogen-fixation
3. oxidation
4. denitrification

Q. In the given Aldose which can form the same osazone
(I) D - glucose
(II) D - gulose
(III) D - mannose
(IV) D - galactose

1. I, III
2. I, III, IV
3. III, IV
4. I, II

Q. Enzymes speed up biochemical reactions by:

1. Increasing the temperature of the reaction
2. Lowering the temperature of the reaction
3. Increasing the activation energy of the reaction
4. Lowering the activation energy of the reaction

Q.

Which amino acid acts as a main donor of amino group in transamination?

1. Glutamic acid

2. Glutamine

3. Glutamate dehydrogenase

4. Glycine

Q. Transamination is a process which involves

1. Synthesis of amino acid
2. Reaction of ammonia with ketoglutaric acid and forms glutamic acid
3. The transfer of amino group from one amino acid to the keto acid
4. The transfer to amino group from ketoglutaric acid to the amino acid

Q.

Nitrifying bacteria

1. reduce nitrates to free nitrogen

2. oxidize ammonia to nitrates

3. convert free nitrogen to nitrogen compounds

4. convert proteins to ammonia

Q. An important essential element necessary in the plants for protein synthesis is

1. Calcium
2. Phosphorus
3. Magnesium
4. Nitrogen

Q.

Identify the enzymes catalysing reactions (A) and (B)

(A)$\alpha$-ketoglutarate + ${NH}^{4+}$ + NADPH $\to$ Glutamate + $H_{2}O$ + $NAD{P}^{+}$

(B)$R-CH-\left(COO\right)N{H}_2+R_1-\left(CO\right)COO\to R-\left(CO\right)COO+R_1-CH-\left(COO\right)N{H}_2$

1. A - Nitrogenase, B - Transaminase

2. A - Glutamate aminase, B - Dehydrogenase

3. A - Glutamate dehydrogenase, B - Transaminase

4. A - Transaminase, B - Glutamate dehydrogenase

Q.

Identify the enzymes catalysing reactions (A) and (B)

(A)$\alpha$-ketoglutarate + ${NH}^{4+}$ + NADPH $\to$ Glutamate + $H_{2}O$ + $NAD{P}^{+}$

(B)$R-CH-\left(COO\right)N{H}_2+R_1-\left(CO\right)COO\to R-\left(CO\right)COO+R_1-CH-\left(COO\right)N{H}_2$

1. A - Glutamate dehydrogenase, B - Transaminase

2. A - Transaminase, B - Glutamate dehydrogenase

3. A - Nitrogenase, B - Transaminase

4. A - Glutamate aminase, B - Dehydrogenase

Q. Azotobacter and Beijerinckia are the examples of

1. symbiotic nitrogen-fixers
2. non-symbiotic nitrogen-fixers
3. ammonifying bacteria
4. disease causing bacteria

Q. Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

1. Defence action
2. Effect on reproduction
3. Growth response
4. Nutritive value

Q.

Identify the enzymes catalysing reactions (A) and (B)

(A)$\alpha$-ketoglutarate + ${NH}^{4+}$ + NADPH $\to$ Glutamate + $H_{2}O$ + $NAD{P}^{+}$

(B)$R-CH-\left(COO\right)N{H}_2+R_1-\left(CO\right)COO\to R-\left(CO\right)COO+R_1-CH-\left(COO\right)N{H}_2$

1. A - Glutamate dehydrogenase, B - Transaminase

2. A - Transaminase, B - Glutamate dehydrogenase

3. A - Nitrogenase, B - Transaminase

4. A - Glutamate aminase, B - Dehydrogenase

Q. Which of the following is called white vitriol ?

1. $ZnC{l}_2$
2. $ZnS{O}_4\cdot 7H_{2}O$
3. $MgS{O}_4\cdot 7H_{2}O$
4. $A{l}_2(S{O}_4{)}_3$

Q.

Which amino acid acts as a main donor of amino group in transamination?

1. Glutamic acid

2. Glutamine

3. Glutamate dehydrogenase

4. Glycine

Q. In plants amino acids are synthesised by

1. Reductive amination
2. Transamination
3. Both a & b
4. Dehydrogenation

Q. Identify the incorrect statement related to the fate of ammonia.

1. $N{H}_3$ is protonated to form $N{H}_4$
2. $N{H}_4^{+}$ ion formed is used for reductive amination
3. Glutamic acid formed due to reductive amination undergoes transamination
4. Plants accumulate nitrogen in the form of ammonium

Q.

Denitrification is done by

1. Nitrosomonas bacteria

2. Nitrobacter bacteria

3. Pseudomonas bacteria

4. putrefying bacteria

Q. Azotobacter and Beijerinckia are the examples of

1. symbiotic nitrogen-fixers
2. non-symbiotic nitrogen-fixers
3. ammonifying bacteria
4. disease causing bacteria

Q.

Denitrification is carried out in soil by _____________?