Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils. - These were the first organism which evolved on the earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles.
AIPMT-2001
Biological Classification
258410
Difference in gram positive and gram negative bacteria is due to -
1 Cell wall
2 Cell membrane
3 Ribosome
4 Cytoplasm
Explanation:
Gram stain, is a method of staining used to classify bacterial species into two large group: grampositive bacteria and gram-negative bacteria. The name comes from the Hans Christian Gram, in 1884. Those bacteria which retain the stain are known as Gram positive and those which do not retain the stain are called Gram negative. - The cell wall in bacteria contains peptidoglycan, a polymer of $\mathrm{N}$-acetyl glucosamine, $\mathrm{N}$ - acetyl muramic acid and amino acids. - Gram-positive cell walls contain a thick layer of peptidoglycan that encircles the cell. - Gram- negative cell walls contain a thin layer of peptidoglycan between the cytoplasmic membrane and the outer membrane.
AIPMT-2001
Biological Classification
258415
The function of leghaemoglobin in the root nodules of legumes is :
1 expression of nif gene
2 inhibition of nitrogenase activity
3 oxygen removal
4 nodule differentiation
Explanation:
Leghaemoglobin is an oxygen scavenger. It protects the nitrogen fixing enzyme nitrogenase. - The nitrogenase enzyme is responsible for converting atmospheric nitrogen into ammonia. - Leghaemoglobin can't inhibit nitrogenase activity.
AIPMT (Screening)-2011
Biological Classification
258416
Nitrifying bacteria :
1 reduce nitrates to free nitrogen
2 oxidize ammonia to nitrates
3 convert free nitrogen to compounds
4 convert proteins into ammonia
Explanation:
In the process of bacteria nitrification, ammonia is converted into nitrate with the presence of bacteria in the soil, nitrate are formed by the oxidation of ammonia with the help of Nitrosomonas bacteria species. - The process of bacteria nitrification involves the following reaction. $2 \mathrm{NH}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2}^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_{2} \mathrm{O}$ $2 \mathrm{NO}_{2}^{-}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{3}^{-}$
AIPMT (Screening)-2011
Biological Classification
258418
Organisms called Methanogens are most abundant in a
1 Hot spring
2 Sulphur rock
3 Cattle yard
4 Polluted stream
Explanation:
Methanogens are mostly found in cattle yard and marshy area. Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or bio gas. - Methanogens are coccoid (spherical shaped) or bacilli (rod shaped). They are mostly anaerobic organism. The reduction reaction of $\mathrm{CO}_{2}$ into $\mathrm{CH}_{4}$ in the presence of hydrogen. $\mathrm{CO}_{2}+4 \mathrm{H}_{2} \rightarrow \mathrm{CH}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils. - These were the first organism which evolved on the earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles.
AIPMT-2001
Biological Classification
258410
Difference in gram positive and gram negative bacteria is due to -
1 Cell wall
2 Cell membrane
3 Ribosome
4 Cytoplasm
Explanation:
Gram stain, is a method of staining used to classify bacterial species into two large group: grampositive bacteria and gram-negative bacteria. The name comes from the Hans Christian Gram, in 1884. Those bacteria which retain the stain are known as Gram positive and those which do not retain the stain are called Gram negative. - The cell wall in bacteria contains peptidoglycan, a polymer of $\mathrm{N}$-acetyl glucosamine, $\mathrm{N}$ - acetyl muramic acid and amino acids. - Gram-positive cell walls contain a thick layer of peptidoglycan that encircles the cell. - Gram- negative cell walls contain a thin layer of peptidoglycan between the cytoplasmic membrane and the outer membrane.
AIPMT-2001
Biological Classification
258415
The function of leghaemoglobin in the root nodules of legumes is :
1 expression of nif gene
2 inhibition of nitrogenase activity
3 oxygen removal
4 nodule differentiation
Explanation:
Leghaemoglobin is an oxygen scavenger. It protects the nitrogen fixing enzyme nitrogenase. - The nitrogenase enzyme is responsible for converting atmospheric nitrogen into ammonia. - Leghaemoglobin can't inhibit nitrogenase activity.
AIPMT (Screening)-2011
Biological Classification
258416
Nitrifying bacteria :
1 reduce nitrates to free nitrogen
2 oxidize ammonia to nitrates
3 convert free nitrogen to compounds
4 convert proteins into ammonia
Explanation:
In the process of bacteria nitrification, ammonia is converted into nitrate with the presence of bacteria in the soil, nitrate are formed by the oxidation of ammonia with the help of Nitrosomonas bacteria species. - The process of bacteria nitrification involves the following reaction. $2 \mathrm{NH}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2}^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_{2} \mathrm{O}$ $2 \mathrm{NO}_{2}^{-}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{3}^{-}$
AIPMT (Screening)-2011
Biological Classification
258418
Organisms called Methanogens are most abundant in a
1 Hot spring
2 Sulphur rock
3 Cattle yard
4 Polluted stream
Explanation:
Methanogens are mostly found in cattle yard and marshy area. Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or bio gas. - Methanogens are coccoid (spherical shaped) or bacilli (rod shaped). They are mostly anaerobic organism. The reduction reaction of $\mathrm{CO}_{2}$ into $\mathrm{CH}_{4}$ in the presence of hydrogen. $\mathrm{CO}_{2}+4 \mathrm{H}_{2} \rightarrow \mathrm{CH}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils. - These were the first organism which evolved on the earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles.
AIPMT-2001
Biological Classification
258410
Difference in gram positive and gram negative bacteria is due to -
1 Cell wall
2 Cell membrane
3 Ribosome
4 Cytoplasm
Explanation:
Gram stain, is a method of staining used to classify bacterial species into two large group: grampositive bacteria and gram-negative bacteria. The name comes from the Hans Christian Gram, in 1884. Those bacteria which retain the stain are known as Gram positive and those which do not retain the stain are called Gram negative. - The cell wall in bacteria contains peptidoglycan, a polymer of $\mathrm{N}$-acetyl glucosamine, $\mathrm{N}$ - acetyl muramic acid and amino acids. - Gram-positive cell walls contain a thick layer of peptidoglycan that encircles the cell. - Gram- negative cell walls contain a thin layer of peptidoglycan between the cytoplasmic membrane and the outer membrane.
AIPMT-2001
Biological Classification
258415
The function of leghaemoglobin in the root nodules of legumes is :
1 expression of nif gene
2 inhibition of nitrogenase activity
3 oxygen removal
4 nodule differentiation
Explanation:
Leghaemoglobin is an oxygen scavenger. It protects the nitrogen fixing enzyme nitrogenase. - The nitrogenase enzyme is responsible for converting atmospheric nitrogen into ammonia. - Leghaemoglobin can't inhibit nitrogenase activity.
AIPMT (Screening)-2011
Biological Classification
258416
Nitrifying bacteria :
1 reduce nitrates to free nitrogen
2 oxidize ammonia to nitrates
3 convert free nitrogen to compounds
4 convert proteins into ammonia
Explanation:
In the process of bacteria nitrification, ammonia is converted into nitrate with the presence of bacteria in the soil, nitrate are formed by the oxidation of ammonia with the help of Nitrosomonas bacteria species. - The process of bacteria nitrification involves the following reaction. $2 \mathrm{NH}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2}^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_{2} \mathrm{O}$ $2 \mathrm{NO}_{2}^{-}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{3}^{-}$
AIPMT (Screening)-2011
Biological Classification
258418
Organisms called Methanogens are most abundant in a
1 Hot spring
2 Sulphur rock
3 Cattle yard
4 Polluted stream
Explanation:
Methanogens are mostly found in cattle yard and marshy area. Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or bio gas. - Methanogens are coccoid (spherical shaped) or bacilli (rod shaped). They are mostly anaerobic organism. The reduction reaction of $\mathrm{CO}_{2}$ into $\mathrm{CH}_{4}$ in the presence of hydrogen. $\mathrm{CO}_{2}+4 \mathrm{H}_{2} \rightarrow \mathrm{CH}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils. - These were the first organism which evolved on the earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles.
AIPMT-2001
Biological Classification
258410
Difference in gram positive and gram negative bacteria is due to -
1 Cell wall
2 Cell membrane
3 Ribosome
4 Cytoplasm
Explanation:
Gram stain, is a method of staining used to classify bacterial species into two large group: grampositive bacteria and gram-negative bacteria. The name comes from the Hans Christian Gram, in 1884. Those bacteria which retain the stain are known as Gram positive and those which do not retain the stain are called Gram negative. - The cell wall in bacteria contains peptidoglycan, a polymer of $\mathrm{N}$-acetyl glucosamine, $\mathrm{N}$ - acetyl muramic acid and amino acids. - Gram-positive cell walls contain a thick layer of peptidoglycan that encircles the cell. - Gram- negative cell walls contain a thin layer of peptidoglycan between the cytoplasmic membrane and the outer membrane.
AIPMT-2001
Biological Classification
258415
The function of leghaemoglobin in the root nodules of legumes is :
1 expression of nif gene
2 inhibition of nitrogenase activity
3 oxygen removal
4 nodule differentiation
Explanation:
Leghaemoglobin is an oxygen scavenger. It protects the nitrogen fixing enzyme nitrogenase. - The nitrogenase enzyme is responsible for converting atmospheric nitrogen into ammonia. - Leghaemoglobin can't inhibit nitrogenase activity.
AIPMT (Screening)-2011
Biological Classification
258416
Nitrifying bacteria :
1 reduce nitrates to free nitrogen
2 oxidize ammonia to nitrates
3 convert free nitrogen to compounds
4 convert proteins into ammonia
Explanation:
In the process of bacteria nitrification, ammonia is converted into nitrate with the presence of bacteria in the soil, nitrate are formed by the oxidation of ammonia with the help of Nitrosomonas bacteria species. - The process of bacteria nitrification involves the following reaction. $2 \mathrm{NH}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2}^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_{2} \mathrm{O}$ $2 \mathrm{NO}_{2}^{-}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{3}^{-}$
AIPMT (Screening)-2011
Biological Classification
258418
Organisms called Methanogens are most abundant in a
1 Hot spring
2 Sulphur rock
3 Cattle yard
4 Polluted stream
Explanation:
Methanogens are mostly found in cattle yard and marshy area. Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or bio gas. - Methanogens are coccoid (spherical shaped) or bacilli (rod shaped). They are mostly anaerobic organism. The reduction reaction of $\mathrm{CO}_{2}$ into $\mathrm{CH}_{4}$ in the presence of hydrogen. $\mathrm{CO}_{2}+4 \mathrm{H}_{2} \rightarrow \mathrm{CH}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils. - These were the first organism which evolved on the earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles.
AIPMT-2001
Biological Classification
258410
Difference in gram positive and gram negative bacteria is due to -
1 Cell wall
2 Cell membrane
3 Ribosome
4 Cytoplasm
Explanation:
Gram stain, is a method of staining used to classify bacterial species into two large group: grampositive bacteria and gram-negative bacteria. The name comes from the Hans Christian Gram, in 1884. Those bacteria which retain the stain are known as Gram positive and those which do not retain the stain are called Gram negative. - The cell wall in bacteria contains peptidoglycan, a polymer of $\mathrm{N}$-acetyl glucosamine, $\mathrm{N}$ - acetyl muramic acid and amino acids. - Gram-positive cell walls contain a thick layer of peptidoglycan that encircles the cell. - Gram- negative cell walls contain a thin layer of peptidoglycan between the cytoplasmic membrane and the outer membrane.
AIPMT-2001
Biological Classification
258415
The function of leghaemoglobin in the root nodules of legumes is :
1 expression of nif gene
2 inhibition of nitrogenase activity
3 oxygen removal
4 nodule differentiation
Explanation:
Leghaemoglobin is an oxygen scavenger. It protects the nitrogen fixing enzyme nitrogenase. - The nitrogenase enzyme is responsible for converting atmospheric nitrogen into ammonia. - Leghaemoglobin can't inhibit nitrogenase activity.
AIPMT (Screening)-2011
Biological Classification
258416
Nitrifying bacteria :
1 reduce nitrates to free nitrogen
2 oxidize ammonia to nitrates
3 convert free nitrogen to compounds
4 convert proteins into ammonia
Explanation:
In the process of bacteria nitrification, ammonia is converted into nitrate with the presence of bacteria in the soil, nitrate are formed by the oxidation of ammonia with the help of Nitrosomonas bacteria species. - The process of bacteria nitrification involves the following reaction. $2 \mathrm{NH}_{3}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2}^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_{2} \mathrm{O}$ $2 \mathrm{NO}_{2}^{-}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{3}^{-}$
AIPMT (Screening)-2011
Biological Classification
258418
Organisms called Methanogens are most abundant in a
1 Hot spring
2 Sulphur rock
3 Cattle yard
4 Polluted stream
Explanation:
Methanogens are mostly found in cattle yard and marshy area. Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or bio gas. - Methanogens are coccoid (spherical shaped) or bacilli (rod shaped). They are mostly anaerobic organism. The reduction reaction of $\mathrm{CO}_{2}$ into $\mathrm{CH}_{4}$ in the presence of hydrogen. $\mathrm{CO}_{2}+4 \mathrm{H}_{2} \rightarrow \mathrm{CH}_{4}+2 \mathrm{H}_{2} \mathrm{O}$
