NEET Test Series from KOTA - 10 Papers In MS WORD
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Biological Classification
258278
In bacteria, plasmid is : -
1 Extra chromosomal material
2 Main DNA
3 Non functional DNA
4 Repetative gene
Explanation:
The bacteria have a extra-chromosomal material known as plasmid. - The plasmid used in genetic engineering. It is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. - It is the most commonly used bacterial cloning vector. - It is naturally existing in bacterial cell and also occur in some eukaryotes.
AIPMT-2002
Biological Classification
258279
Choose the correct sequence of stages of growth curve for Bacteria
1 Lag, Log, stationary, Decline phase
2 Lag, Log, Stationary phase
3 Stationary, Lag, Log, Decline phase
4 Decline, Lag, Log phase
Explanation:
When microbes are grown in a closed system or batch culture, the resulting growth curve has usually four phase- 1 Lag phase 2 Log phase 3 Stationary phase 4 Death phase - Time-dependent size of a growing bacterial cell population is commonly represented in log-scale against time, in which case, the lag and the exponential phase form a J-shaped curve.
AIPMT-2002
Biological Classification
258281
'Comma' shaped bacteria are known as:
1 coccus
2 spiral
3 lophotrichus
4 vibrio
Explanation:
Comma shaped bacteria are called as Vibrio. It causes various systemic diseases such as cholera. Eg. Vibrio cholera, Vibrio vulnificus etc. 9 Coma shaped - Coccus or cocci- It is spherical in shape smallest bacteria eg-Diplodocus pneumonae. - Spiral bacteria- It is coiled in shaped eg- Spirillum minus, Spirillum valutane. Biological Classification Lophotrichus- The tuft of flagella at the end is called Lophotrichus, eg- Salmonella, Spirillum valutan.
AFMC-2001
Biological Classification
258284
Which one of the following is not characteristic of gram-positive bacteria?
1 Cell wall is smooth
2 Mesosomes are distinctively prominent
3 Basal body of flagellum contains 2 rings
4 Outer membrane is present
5 Murein content of cell wall is $70-80 \%$
Explanation:
On the basis of peptidoglycan in Gram positive bacteria is thick $70-80 \%$ in Gram negative bacteria peptidoglycan single layer thin $10-20 \%$. - In Gram negative bacteria out side of the peptidoglycan, other layer is present called liposaccharide due to which Gram negative bacteria are mostly pathogenic and liposaccharide layer absent in Gram positive bacteria but in Gram positive bacteria, teichoic acid is present and absent in Gram negative bacteria. - Thickening of cell wall in Gram + ve bacteria 20-80 nm but in Gram - ve bacteria 8-12 nm. - Gram positive bacteria non pathogenic and asceptable to antibiotics but Gram negative bacteria are resistance to antibiotics - Mesosomes are prominent in gram positive but less prominent in gram negative bacteria. - In Gram + ve bacteria blue voilet colour retains after the washing with alcohol, but in Gram -ve bacteria colour is washed.
The bacteria have a extra-chromosomal material known as plasmid. - The plasmid used in genetic engineering. It is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. - It is the most commonly used bacterial cloning vector. - It is naturally existing in bacterial cell and also occur in some eukaryotes.
AIPMT-2002
Biological Classification
258279
Choose the correct sequence of stages of growth curve for Bacteria
1 Lag, Log, stationary, Decline phase
2 Lag, Log, Stationary phase
3 Stationary, Lag, Log, Decline phase
4 Decline, Lag, Log phase
Explanation:
When microbes are grown in a closed system or batch culture, the resulting growth curve has usually four phase- 1 Lag phase 2 Log phase 3 Stationary phase 4 Death phase - Time-dependent size of a growing bacterial cell population is commonly represented in log-scale against time, in which case, the lag and the exponential phase form a J-shaped curve.
AIPMT-2002
Biological Classification
258281
'Comma' shaped bacteria are known as:
1 coccus
2 spiral
3 lophotrichus
4 vibrio
Explanation:
Comma shaped bacteria are called as Vibrio. It causes various systemic diseases such as cholera. Eg. Vibrio cholera, Vibrio vulnificus etc. 9 Coma shaped - Coccus or cocci- It is spherical in shape smallest bacteria eg-Diplodocus pneumonae. - Spiral bacteria- It is coiled in shaped eg- Spirillum minus, Spirillum valutane. Biological Classification Lophotrichus- The tuft of flagella at the end is called Lophotrichus, eg- Salmonella, Spirillum valutan.
AFMC-2001
Biological Classification
258284
Which one of the following is not characteristic of gram-positive bacteria?
1 Cell wall is smooth
2 Mesosomes are distinctively prominent
3 Basal body of flagellum contains 2 rings
4 Outer membrane is present
5 Murein content of cell wall is $70-80 \%$
Explanation:
On the basis of peptidoglycan in Gram positive bacteria is thick $70-80 \%$ in Gram negative bacteria peptidoglycan single layer thin $10-20 \%$. - In Gram negative bacteria out side of the peptidoglycan, other layer is present called liposaccharide due to which Gram negative bacteria are mostly pathogenic and liposaccharide layer absent in Gram positive bacteria but in Gram positive bacteria, teichoic acid is present and absent in Gram negative bacteria. - Thickening of cell wall in Gram + ve bacteria 20-80 nm but in Gram - ve bacteria 8-12 nm. - Gram positive bacteria non pathogenic and asceptable to antibiotics but Gram negative bacteria are resistance to antibiotics - Mesosomes are prominent in gram positive but less prominent in gram negative bacteria. - In Gram + ve bacteria blue voilet colour retains after the washing with alcohol, but in Gram -ve bacteria colour is washed.
The bacteria have a extra-chromosomal material known as plasmid. - The plasmid used in genetic engineering. It is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. - It is the most commonly used bacterial cloning vector. - It is naturally existing in bacterial cell and also occur in some eukaryotes.
AIPMT-2002
Biological Classification
258279
Choose the correct sequence of stages of growth curve for Bacteria
1 Lag, Log, stationary, Decline phase
2 Lag, Log, Stationary phase
3 Stationary, Lag, Log, Decline phase
4 Decline, Lag, Log phase
Explanation:
When microbes are grown in a closed system or batch culture, the resulting growth curve has usually four phase- 1 Lag phase 2 Log phase 3 Stationary phase 4 Death phase - Time-dependent size of a growing bacterial cell population is commonly represented in log-scale against time, in which case, the lag and the exponential phase form a J-shaped curve.
AIPMT-2002
Biological Classification
258281
'Comma' shaped bacteria are known as:
1 coccus
2 spiral
3 lophotrichus
4 vibrio
Explanation:
Comma shaped bacteria are called as Vibrio. It causes various systemic diseases such as cholera. Eg. Vibrio cholera, Vibrio vulnificus etc. 9 Coma shaped - Coccus or cocci- It is spherical in shape smallest bacteria eg-Diplodocus pneumonae. - Spiral bacteria- It is coiled in shaped eg- Spirillum minus, Spirillum valutane. Biological Classification Lophotrichus- The tuft of flagella at the end is called Lophotrichus, eg- Salmonella, Spirillum valutan.
AFMC-2001
Biological Classification
258284
Which one of the following is not characteristic of gram-positive bacteria?
1 Cell wall is smooth
2 Mesosomes are distinctively prominent
3 Basal body of flagellum contains 2 rings
4 Outer membrane is present
5 Murein content of cell wall is $70-80 \%$
Explanation:
On the basis of peptidoglycan in Gram positive bacteria is thick $70-80 \%$ in Gram negative bacteria peptidoglycan single layer thin $10-20 \%$. - In Gram negative bacteria out side of the peptidoglycan, other layer is present called liposaccharide due to which Gram negative bacteria are mostly pathogenic and liposaccharide layer absent in Gram positive bacteria but in Gram positive bacteria, teichoic acid is present and absent in Gram negative bacteria. - Thickening of cell wall in Gram + ve bacteria 20-80 nm but in Gram - ve bacteria 8-12 nm. - Gram positive bacteria non pathogenic and asceptable to antibiotics but Gram negative bacteria are resistance to antibiotics - Mesosomes are prominent in gram positive but less prominent in gram negative bacteria. - In Gram + ve bacteria blue voilet colour retains after the washing with alcohol, but in Gram -ve bacteria colour is washed.
The bacteria have a extra-chromosomal material known as plasmid. - The plasmid used in genetic engineering. It is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. - It is the most commonly used bacterial cloning vector. - It is naturally existing in bacterial cell and also occur in some eukaryotes.
AIPMT-2002
Biological Classification
258279
Choose the correct sequence of stages of growth curve for Bacteria
1 Lag, Log, stationary, Decline phase
2 Lag, Log, Stationary phase
3 Stationary, Lag, Log, Decline phase
4 Decline, Lag, Log phase
Explanation:
When microbes are grown in a closed system or batch culture, the resulting growth curve has usually four phase- 1 Lag phase 2 Log phase 3 Stationary phase 4 Death phase - Time-dependent size of a growing bacterial cell population is commonly represented in log-scale against time, in which case, the lag and the exponential phase form a J-shaped curve.
AIPMT-2002
Biological Classification
258281
'Comma' shaped bacteria are known as:
1 coccus
2 spiral
3 lophotrichus
4 vibrio
Explanation:
Comma shaped bacteria are called as Vibrio. It causes various systemic diseases such as cholera. Eg. Vibrio cholera, Vibrio vulnificus etc. 9 Coma shaped - Coccus or cocci- It is spherical in shape smallest bacteria eg-Diplodocus pneumonae. - Spiral bacteria- It is coiled in shaped eg- Spirillum minus, Spirillum valutane. Biological Classification Lophotrichus- The tuft of flagella at the end is called Lophotrichus, eg- Salmonella, Spirillum valutan.
AFMC-2001
Biological Classification
258284
Which one of the following is not characteristic of gram-positive bacteria?
1 Cell wall is smooth
2 Mesosomes are distinctively prominent
3 Basal body of flagellum contains 2 rings
4 Outer membrane is present
5 Murein content of cell wall is $70-80 \%$
Explanation:
On the basis of peptidoglycan in Gram positive bacteria is thick $70-80 \%$ in Gram negative bacteria peptidoglycan single layer thin $10-20 \%$. - In Gram negative bacteria out side of the peptidoglycan, other layer is present called liposaccharide due to which Gram negative bacteria are mostly pathogenic and liposaccharide layer absent in Gram positive bacteria but in Gram positive bacteria, teichoic acid is present and absent in Gram negative bacteria. - Thickening of cell wall in Gram + ve bacteria 20-80 nm but in Gram - ve bacteria 8-12 nm. - Gram positive bacteria non pathogenic and asceptable to antibiotics but Gram negative bacteria are resistance to antibiotics - Mesosomes are prominent in gram positive but less prominent in gram negative bacteria. - In Gram + ve bacteria blue voilet colour retains after the washing with alcohol, but in Gram -ve bacteria colour is washed.
