The process of making a complementary DNA (cDNA) from mRNA using reverse transcriptase is called:
A. Reverse transcription
B. Transformation
C. Translation
D. Replication
Answer: Option A
Solution (By JKSSB Mock Tests)
Reverse transcription synthesizes DNA from an RNA template, catalyzed by reverse transcriptase in retroviruses and used in molecular biology for cDNA synthesis.
Explanation:
Rhodopsin (visual purple) is a photopigment in rod cells consisting of opsin and retinal (from vitamin A). It bleaches upon absorbing light, initiating signal transduction for vision in low light. Cone cells contain iodopsin for color vision. Melanin is skin pigment, hemoglobin carries oxygen.
Explanation:
Penicillin, the first true antibiotic, was discovered by Alexander Fleming in 1928. He observed that a mold contaminating a Staphylococcus culture plate was inhibiting bacterial growth. The mold was identified as Penicillium notatum (now P. chrysogenum). Penicillin is extracted from this fungus and is effective against many Gram-positive bacteria.
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