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TLS Online TPP Program

#Question id: 2750

Which of the following is true of histones?

#Botany

  1. Histones are acidic proteins.

  2. Histones are found in animal chromatin but in not plant cells.

  3. The amino acid sequences of histone proteins are very similar in different organisms.

  4. All histones form part of the nucleosome core particles in chromatin.

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TLS Online TPP Program

#Question id: 40188

#Applied Microbiology

Match the growth phase in Column A with its correct characteristic in Column B.

Column A (Phase)Column B (Characteristic)
1. Lag PhaseA. Exponential decrease in the number of living cells.
2. Log PhaseB. Adaptation to new environment; synthesis of enzymes.
3. Stationary PhaseC. Nutrient depletion leads to equal rates of growth and death.
4. Death PhaseD. Uniform and rapid cell division; population doubles.
TLS Online TPP Program

#Question id: 40189

#Applied Microbiology

Read the following statements regarding the bacterial growth curve and choose the correct option.

Statement I: In the Lag phase, there is an immediate increase in the cell number as bacteria start dividing instantly.

Statement II: Secondary metabolites (like antibiotics) are predominantly produced during the Stationary phase.
TLS Online TPP Program

#Question id: 40190

#Applied Microbiology

Assertion (A): The generation time is shortest during the exponential (log) phase.

Reason (R): In the exponential phase, bacteria are adapting to the environment and repairing cellular damage. 
TLS Online TPP Program

#Question id: 40191

#Applied Microbiology

Which of the following terms describes organisms that require high hydrostatic pressure for growth and reproduction?
TLS Online TPP Program

#Question id: 40192

#Applied Microbiology

Match the organism type in Column A with its specific environmental requirement in Column B.

Column A (Organism)Column B (Environment)
1. PsychrophilesA. High salt concentration
2. HalophilesB. Temperatures below 15°C
3. AlkaliphilesC. High CO2 concentration
4. CapnophilesD. pH above 9.0
TLS Online TPP Program

#Question id: 40193

#Applied Microbiology

Read the following statements:

Statement I: Obligate anaerobes cannot survive in the presence of oxygen because they lack the enzymes catalase and superoxide dismutase.

Statement II: Facultative anaerobes require oxygen for growth and cannot grow in its absence