The term 'plasmolysis' refers to: MCQ with Answer and Explanation

Explanation:
Clostridium botulinum, an anaerobic spore-forming bacterium, produces a potent neurotoxin causing botulism, often from improperly canned low-acid foods. Salmonella and E. coli cause gastroenteritis from contaminated food/water, Staphylococcus aureus produces enterotoxins causing acute vomiting. Botulism can be fatal without antitoxin.

Explanation:
The tricuspid valve (right atrioventricular valve) has three cusps and closes during ventricular systole to prevent regurgitation into the right atrium. The bicuspid (mitral) is on the left side. Aortic and pulmonary valves are semilunar valves at the ventricular outlets.

Explanation:
The limbic system is a group of brain structures located on both sides of the thalamus, supporting emotion, behavior, motivation, long-term memory, and olfaction. The amygdala is an almond-shaped collection of nuclei located deep within the medial temporal lobes. It is a crucial component of the limbic system primarily associated with processing emotions, particularly fear, anxiety, and aggression. It plays a key role in the 'fight or flight' response and in attaching emotional significance to memories. The hippocampus is primarily for forming new declarative memories.