The scientist who discovered the bacterium that causes tuberculosis is:
A. Edward Jenner
B. Louis Pasteur
C. Robert Koch
D. Joseph Lister
Answer: Option C
Solution (By JKSSB Mock Tests)
Robert Koch identified Mycobacterium tuberculosis as the causative agent of tuberculosis in 1882, applying his postulates. He also discovered the cholera bacillus. Pasteur worked on vaccines, Jenner smallpox, Lister antisepsis.
Explanation:
Antidiuretic Hormone (ADH), also known as vasopressin, is released by the posterior pituitary in response to osmotic pressure or fluid loss. It acts primarily on the collecting ducts of the nephrons to increase water reabsorption by making them more permeable to water. This prevents diuresis (excessive urine production) and helps conserve body water.
Explanation:
Binary fission is the primary asexual reproduction method in bacteria, where the cell divides into two identical daughter cells after DNA replication. Budding occurs in yeast and some bacteria. Conjugation and transformation are methods of genetic exchange, not reproduction. Binary fission allows rapid population growth.
Consider statements about the endoplasmic reticulum: 1. Rough ER has ribosomes attached. 2. Smooth ER synthesizes lipids. 3. Rough ER is involved in detoxification. Which are correct?
Explanation:
The rough endoplasmic reticulum (RER) has ribosomes attached to its cytoplasmic surface, making it appear rough, and is primarily involved in protein synthesis and modification. The smooth endoplasmic reticulum (SER) lacks ribosomes and is the major site for lipid synthesis and detoxification of drugs. Statement 3 is incorrect as detoxification is a function of SER.
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