Which cell junction in plant cells allows for cytoplasmic continuity between adjacent cells? MCQ with Answer and Explanation

Explanation:
Natural killer (NK) cells were discovered in the 1970s by Rolf Kiessling and others. They are part of innate immunity, killing virus-infected and tumor cells.

Explanation:
Blood is a fluid connective tissue. Epidermis is epithelial tissue, neuron is part of nervous tissue, smooth muscle is muscle tissue. Connective tissues include bone, cartilage, blood, adipose tissue, and areolar tissue, characterized by cells embedded in a matrix. They provide support, protection, and transport.

Explanation:
Peptide YY (PYY) is a gut hormone secreted by the L cells in the mucosa of the distal small intestine (ileum) and colon, primarily in response to food ingestion, especially fats. Its primary functions are related to the 'ileal brake' mechanism: it inhibits gastric emptying and pancreatic exocrine secretion, slowing down the transit of food through the upper GI tract to allow more time for digestion and absorption in the ileum. It also acts on the hypothalamus to reduce appetite, serving as a satiety signal.