The respiratory pigment hemocyanin contains which metal?
A. Iron
B. Magnesium
C. Zinc
D. Copper
Answer: Option D
Solution (By JKExamLibrary)
Hemocyanin is a blue, copper-containing respiratory pigment found in the hemolymph of some mollusks and arthropods. It binds oxygen reversibly. Hemoglobin contains iron and is red. Magnesium is in chlorophyll, zinc in some enzymes. Hemocyanin is not bound to cells but floats freely in hemolymph.
Explanation:
Crossing over, the exchange of genetic material between non-sister chromatids of homologous chromosomes, occurs during the pachytene stage of prophase I. The synaptonemal complex facilitates this. Chiasmata become visible in diplotene when the synaptonemal complex dissolves. Leptotene is chromosome condensation, zygotene is synapsis. This process is crucial for genetic variation.
Explanation:
Rabies is a fatal viral disease affecting the nervous system, transmitted by the bite of infected animals (dogs, bats). Louis Pasteur developed the rabies vaccine.
Explanation:
Howard Temin and David Baltimore independently discovered reverse transcriptase in retroviruses in 1970, an enzyme that synthesizes DNA from RNA. Watson and Crick DNA structure, Mullis PCR.
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