The enzyme that converts glucose into ethanol in yeast is:
A. Zymase
B. Lactase
C. Maltase
D. Invertase
Answer: Option A
Solution (By JKSSB Mock Tests)
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.
Explanation:
Helicase unwinds the DNA helix at the replication fork by breaking hydrogen bonds between base pairs. DNA polymerase adds nucleotides, ligase seals Okazaki fragments, primase synthesizes RNA primer. This coordinated action ensures accurate semi-conservative replication. Without helicase, the strands would not separate. Energy for unwinding comes from ATP hydrolysis.
Explanation:
Luteinizing hormone (LH) binds to Leydig cells in the testes, stimulating them to produce and secrete testosterone. FSH stimulates Sertoli cells for spermatogenesis. GnRH from hypothalamus stimulates release of LH and FSH.
Explanation:
ICZN stands for the International Commission on Zoological Nomenclature. It is the organization that establishes and maintains the International Code of Zoological Nomenclature, which provides the universal rules for naming animals to ensure stability and universality in scientific names.
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