The correct answer is option (C) ovum.
Ovum or the egg cell is the female gamete that fuses with the sperm to produce the zygote. An ovum is the largest cell in the human body produced by the ovaries of the female reproductive system. It approximately measures about 0.1mm which is equal to 100 µm. A nucleus is present in the ooplasm or the yolk of the ovum.
The sample under the microscope cannot be a single strand of hair or a bacterial cell as both do not contain a nucleus. Also it cannot be a sperm as they do not have a diameter measuring about 100µm. Thus, the sample under a microscope with a diameter of 100 µm and having a nucleus is typically an ovum.
Answer:
Three proteins directly contribute to the proton gradient by moving protons across the membrane
Explanation:
The Electron transport chain is a group of proteins and molecules incrusted in the internal mitochondrial membrane and organized into four complexes, I, II, III, and IV. These complexes contain the electron transporters and the enzymes necessary to catalyze the electron transference from one complex to the other. Complex I contains the flavine mononucleotide -FMN- that receives electrons from the NADH. The coenzyme Q, located in the lipidic interior of the membrane, conducts electrons from complex I and II to complex III. The complex III contains cytochrome b, from where electrons go to cytochrome c, which is a peripheric membrane protein. Electrons travel from cytochrome c to cytochromes a and a3, located in the complex IV. Finally, they go back to the matrix, where they combine to H+ ions and oxygen, to form the water molecule. As electrons are transported through the chain, protons are bombed through three proteinic complexes from the matrix to the intermembrane space. These are complexes I, III and IV.
The double helix of dna in the b form is stabilized by-
1. covalent bond between the 3' end of one strand and the 5' end of another strand.
2. hydrogen bonding between the phosphate groups of two side-by-side strands.
hope this helps u .................
Answer:
Land able to be used for farming is called "cultivable land". Farmland, meanwhile, is used variously in reference to all agricultural land, to all cultivable land, or just to the newly restricted sense of "arable land".
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