The part of the human ear that converts sound vibrations into neural signals is the:
A. Ossicles
B. Cochlea
C. Eardrum
D. Auditory nerve
Answer: Option B
Solution (By JKSSB Mock Tests)
The cochlea, a spiral-shaped organ in the inner ear, contains the organ of Corti with hair cells that transduce mechanical vibrations into electrical impulses. The eardrum and ossicles conduct sound to the cochlea. The auditory nerve transmits impulses to the brain. Thus, transduction occurs in the cochlea.
Explanation:
In prokaryotes, DNA polymerase I has 5'→3' exonuclease activity that removes the RNA primer and fills the gap with DNA. DNA polymerase III adds nucleotides to the growing strand. Ligase seals the nicks. Helicase unwinds DNA. In eukaryotes, RNase H removes primers and DNA polymerase δ fills the gap.
Explanation:
Chlorella and Spirulina (a cyanobacterium) are used as single-cell proteins and health supplements due to their high protein content (up to 60%) and essential nutrients. Gelidium is used for agar, Sargassum is a brown alga, Polysiphonia a red alga. Chlorella is a unicellular green alga.
Explanation:
Calcitonin is produced by the parafollicular (C) cells of the thyroid gland. It lowers blood calcium levels by inhibiting osteoclast activity and promoting calcium deposition in bones. Parathyroid hormone (from parathyroid glands) raises calcium. Adrenal and pituitary glands have other functions.
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