Which of the following statements are correct regarding Crassulacean Acid Metabolism (CAM) plants?

A. They possess "Scotoactive" stomata which open during the night and close during the day.

B. The primary carboxylation enzyme during the night is RuBisCO.

C. Malic acid is stored in the vacuole during the night, leading to acidification of the cell.

D. During the day, malate is decarboxylated to release CO2 for the Calvin Cycle.

Choose the correct answer from the options given below:

#Question id: 40489

#Applied Microbiology

Which class of microorganisms is specifically adapted to grow in environments with very low water activity (high salt concentration)?

#Question id: 40490

#Applied Microbiology

Read the following statements regarding water availability:

Statement I: Water activity (a_w) is defined as the ratio of the vapor pressure of the solution to the vapor pressure of pure water.

Statement II: Most pathogenic bacteria require a water activity (a_w) greater than 0.90 for growth.Which of the options is correct?

#Question id: 40491

#Applied Microbiology

Assertion (A): Foods like jams and jellies rarely undergo bacterial spoilage even at room temperature.

Reason (R): High concentrations of sugar reduce the water activity (a_w), creating hypertonic conditions that dehydrate bacteria (plasmolysis).

#Question id: 40492

#Applied Microbiology

Which molecule on the surface of a Helper T lymphocyte (Th) is responsible for recognizing antigens presented by MHC-II?

#Question id: 40493

#Applied Microbiology

Consider the following statements regarding T-cell activation:

Statement I: MHC-I molecules are found on almost all nucleated cells in the body.

Statement II: Cytotoxic T cells utilize their CD4 co-receptor to stabilize the binding to MHC-I.

#Question id: 40494

#Applied Microbiology

Assertion (A): Cytotoxic T lymphocytes (CTLs) are essential for eliminating virally infected cells.

Reason (R): CTLs recognize viral peptides displayed on MHC-I molecules, which are expressed by nearly all nucleated cells.