Sulfonamides:A) interfere with elongation of peptidoglycanB) are metabolic analogs of PABA and block folic acid synthesisC) attach to the 30S ribosomal subunit and disrupt protein synthesisD) damage cell membranesE) block peptidases that cross-link glycan molecules

The answer is B

Explanation:

sulfonamides inhibit bacterial folic acid synthesize enzyme( Dihydropteroate) which is responsible the activation (PABA) for synthesis of folic acid

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.