Identify the INCORRECT statement about bacteria: MCQ with Answer and Explanation

Explanation:
Parathyroid Hormone (PTH) is a peptide hormone secreted by the chief cells of the four parathyroid glands in response to low blood calcium levels (hypocalcemia). Its primary function is to increase blood calcium levels (hypercalcemic effect). It achieves this by: 1) Stimulating osteoclasts to break down bone, releasing calcium. 2) Increasing calcium reabsorption and stimulating the activation of Vitamin D in the kidneys. 3) Indirectly increasing calcium absorption in the gut via active Vitamin D. It has the opposite effect of calcitonin.

Explanation:
Diatomaceous earth is a siliceous, sedimentary rock formed from the fossilized remains of diatoms. Diatoms have unique, highly resistant cell walls called frustules, made of hydrated silicon dioxide (silica). Over millions of years, these frustules accumulate on ocean and lake floors, forming diatomaceous earth, which has numerous industrial applications due to its abrasive and porous nature.

Explanation:
Beriberi is a disease affecting the nervous and cardiovascular systems due to lack of thiamine (B₁). Scurvy is vitamin C deficiency, pellagra is niacin (B₃), rickets is vitamin D. Thiamine is a coenzyme in carbohydrate metabolism.