The jelly-like substance that fills the cell and holds organelles is the:
A. Nucleoplasm
B. Cytoplasm
C. Matrix
D. Protoplasm
Answer: Option B
Solution (By JKExamLibrary)
Cytoplasm is the semifluid material between the plasma membrane and the nucleus, composed of cytosol, organelles, and inclusions. It is the site of many metabolic reactions. Nucleoplasm is inside the nucleus, protoplasm includes cytoplasm and nucleoplasm, and matrix refers to the inner compartment of mitochondria.
Explanation:
RNA polymerase binds to the promoter region of DNA and synthesizes a complementary RNA strand during transcription. DNA polymerase synthesizes DNA, ligase joins DNA fragments, helicase unwinds DNA.
Explanation:
Ethylene is a gaseous hormone that accelerates ripening, promotes leaf and fruit abscission, and senescence. Auxin and cytokinin promote growth, gibberellin elongation. Ethylene is used commercially for fruit ripening.
Explanation:
Birds (Aves) and mammals (Mammalia) are endothermic (warm-blooded) and possess a four-chambered heart, allowing complete separation of oxygenated and deoxygenated blood. Amphibians have a three-chambered heart, reptiles mostly three-chambered (except crocodilians), fish two-chambered. This allows high metabolic rates.
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