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TLS Online TPP Program

#Question id: 11092

Which statement is the most accurate definition of external respiration?

#Biochemistry
  1. Bulk flow (convection) of air or water to and from the gas-exchange membrane.
  2. The process by which O2 is transported to the gas-exchange membrane from the environmental medium and by which CO2 is transported away from the membrane into the environmental medium.

  3. The process by which CO2 is transported to the gas-exchange membrane from the environmental medium and O2 is transported away from the membrane into the environmental medium.

  4. Diffusion of O2 and CO2 across the gas exchange membrane.
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TLS Online TPP Program

#Question id: 40185

#Applied Microbiology

Read the following statements regarding the bacterial cell envelope:

Statement I: The outer membrane of Gram-negative bacteria contains Lipopolysaccharides (LPS), which consists of Lipid A, Core polysaccharide, and O-antigen.

Statement II: Lysozyme breaks down the bacterial cell wall by cleaving the glycosidic bond between Lipid A and the Core polysaccharide. 
TLS Online TPP Program

#Question id: 40186

#Applied Microbiology

Which of the following are TRUE regarding the difference between Gram-positive and Gram-negative cell walls?

(A) Gram-positive walls have a thick peptidoglycan layer.

(B) Gram-negative walls contain Porin proteins.

(C) Gram-positive walls contain a Periplasmic space.

(D) Gram-negative walls lack Teichoic acids. 

Choose the correct combination:

TLS Online TPP Program

#Question id: 40187

#Applied Microbiology

During which phase of the microbial growth cycle are cells most metabolically active and dividing at a constant maximum rate?
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.