3. For the formation of vertebrate limb, which of the following statement is NOT TRUE? (A) Pattern formation is the process governing the arrangement of organs and tissues in their characteristic 3-D space (B) Pattern formation requires each embryonic cell to receive some kind of positional information indicating location along three axes of the limb (C) The wings and legs of chicks begins with limb bud consisting of only ectoderm (D) The apical ectodermic ridge (AER) secrets FGF (fibroblast growth factor) that promotes distal-proximal limb bud outgrowth.

4. Which of the following statements about excretory system is NOT TRUE? (A) Nephron is the functional unit of kidney (B) The nephron consists of a single long tubule and a ball of capillaries called the glomerulus. Filtration occurs as blood pressure forces fluid from the blood in the glomerulus into the lumen of Bowman's capsule (C) Filtration of small molecules s passes through three regions of the nephron: the proximal tubule, the loop of Henle, and the distal tubule, which are all permeable to salt but not to water (D) The controlled movement of ions (such as ) in the proximal and distal tubules contributes to constant pH in the body fluid

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