During transcription, the enzyme RNA polymerase binds to the:
A. Enhancer
B. Start codon
C. Promoter
D. Terminator
Answer: Option C
Solution (By JKSSB Mock Tests)
RNA polymerase recognizes and binds to the promoter region of DNA, which is located upstream of the coding sequence. This initiates transcription. The terminator signals the end of transcription. Start codon (AUG) is on mRNA where translation begins. Enhancers are regulatory DNA sequences that increase transcription but are not the primary binding site for polymerase.
Explanation:
Edward Jenner developed the first successful vaccine using cowpox to protect against smallpox in 1796. Pasteur developed rabies vaccine, Salk polio, Koch identified TB bacterium.
Explanation:
Petrified fossils (permineralization) form when dissolved minerals infiltrate the porous tissues of dead organisms and harden, turning the remains into stone while preserving internal structure. Mold and cast fossils are impressions, trace fossils are tracks or burrows. Petrified wood is a common example.
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