Consider the following statements about the cell membrane: 1. It is composed of a phospholipid bilayer. 2. It is fully permeable. 3. Proteins are embedded in the membrane. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
The nucleolus makes rRNA and assembles ribosomal subunits. Nucleus has a double membrane, is present in eukaryotes, and is the site of DNA replication.

Explanation:
The nephron is the structural and functional unit of the kidney, responsible for filtration, reabsorption, and secretion to form urine. Each kidney has about 1 million nephrons. A nephron consists of the Bowman's capsule, glomerulus, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct. Neurons are units of nervous system, alveoli of lungs, hepatocytes of liver.

Explanation:
Luteinizing Hormone (LH) is a gonadotropin secreted by the gonadotroph cells of the anterior pituitary. In females, during the late follicular phase, rising estrogen levels exert positive feedback on the pituitary, causing a massive, sudden surge of LH (the LH surge). This surge directly triggers ovulation (the rupture of the mature Graafian follicle and release of the secondary oocyte) and subsequently stimulates the remaining follicular cells to transform into the corpus luteum, which secretes progesterone.