When a molecule of NAD^+ () gains a hydrogen atom and electrons to NADH, the mol

Question

When a molecule of NAD^+ () gains a hydrogen atom and electrons to NADH, the molecule becomes A) a reducing agent. B) reduced. C) oxidized. D) hydrogenated. E) redocked. Which of the followings is true of metabolism in its entirety in all organism? A) Metabolism depends on a constant in of energy from food. B) Metabolism depends on an organism's adequate hydration. C) Metabolism consists of all time the chemical and energy transformation reactions in an organism. D) Metabolism uses all of an organism's resources. E) Metabolism manages the increase of entropy in an organism. Which of the following occurs in the of a eukaryotic cell? A) glycolysis and fermentation B) oxidative phosphorylation C) citric acid cycle D) fermentation and E) condonation of pyruvate to acetyl CeA Which of the following types of molecules are the major structural components of the cell membrane? A) phospholipids and cellulose B) glycoproteins and cholesterol C) proteins and cellules D) nucleic and proteins E) phospholipids and proteins During aerobic respiration electrons travel downfall in which sequence? A) food - citric acid cycle - ATP - NAD + B) glucoses - ATP - electron transport chain - NADH C) food - glycolysis - citric acid cycle - NADH - ATP D) glucose - pyruvate - ATP - oxygen E) food - NADH - electron transport chain - oxygen Where are the proteins of the electron transport chain located? A) mitochondrial matrix B) cytosol C) mitochondrial cumber membrane D) mitochondrial inner membrane E) mitochondrial inter membrane space Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules? A) proteins B) glucose C) steroids D) lipids E) starches

Explanation / Answer

42. When a molecule of NAD+ accept H and becomes NADH, it is reduced (B)

Reason : The coenzyme Nicotinamide adenine dinucleotide is found in two forms in cells : oxidized form as NAD+. It is an oxidizing agent and accepts electrons from other molecules to becomes reduced as NADH, which can then be used as a reducing agent for donating electrons.

43. Correct answer is (c) : Metabolism consists of all the chemical and energy transformation occurring in an organism.

Reason : The term 'Metabolism' comprises all the chemical reactions occurring in a cell to the living state of the cells and the organism. Metabolism are of two types :

Catabolism or the breakdown of molecules to obtain energy by the cells

Anabolism or the synthesis of nessary compounds required by the cells

44. Correct answer is (A) : glycolysis and fermentation.

Reason : In eukaryotic cells during respiration the glycolysis and fermentation reactions occur in the cytoplasm, while the other remaining pathways happen in mitochondria

45. Correct answer is (E) : phospholipids and proteins.

Reason : According to the fluid mosaic model, the cell membrane or plasma membrane is composed of primarily, phospholipids, cholesterol, and proteins, the proteins are minority components that move freely and fluidly in the lipid bilayer of the membrane.

47. Correct answer is (D): inner mitochondrial membrane.

Reason : The enzymes and proteins involved in ETC is situated in the inner mitochondrial membrane

48. Correct answer is (A) : Protein.

Reason : the ribosomes are involved in protein synthesis in a cell thus are often called protein factories of the cell.

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