The process of cell division that results in the production of identical daughter cells for growth and repair is:
A. Mitosis
B. Budding
C. Meiosis
D. Binary fission
Answer: Option A
Solution (By JKSSB Mock Tests)
Mitosis is equational division producing two genetically identical diploid daughter cells, essential for growth, development, and tissue repair in multicellular organisms. Meiosis produces haploid gametes with variation, binary fission is asexual in prokaryotes, budding in yeast. Mitosis maintains chromosome number.
Explanation:
Thyroid-stimulating hormone (TSH), secreted by the anterior pituitary, binds to receptors on thyroid follicular cells and stimulates them to produce and release T₃ and T₄. ACTH stimulates adrenal cortex, FSH and LH target gonads.
Explanation:
Howard Temin and David Baltimore independently discovered reverse transcriptase in retroviruses in 1970, an enzyme that synthesizes DNA from RNA. Watson and Crick DNA structure, Mullis PCR.
Consider statements about human circulation: 1. Arteries carry oxygenated blood. 2. Veins have valves to prevent backflow. 3. Capillaries have thick walls. Which are correct?
Explanation:
While most arteries carry oxygenated blood, the pulmonary artery carries deoxygenated blood from the heart to the lungs. Veins possess valves along their length to ensure unidirectional blood flow back to the heart against gravity. Capillaries are composed of a single layer of endothelial cells (thin walls) to facilitate the exchange of gases and nutrients. Only statement 2 is universally correct.
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