26) The structural level of a protein lest afected by a disnuption in hydrogen b

Question

26) The structural level of a protein lest afected by a disnuption in hydrogen bonding is the 26) A) All structural levels are equally affected. B) quaternary level. C) secondary level. D) tertiary level E) primary level. primary function of polysacharides attached to the glycoproteins and glycolipids of animal 27) cell membranes is A) to maintain membrane fluidity at low temperatures B) to maintain the integrity of a fluid mosaic membrane. C) to mediate cell-to-cell recognition. D) to actively transport molecules against their concentration gradients E) to facilitate diffusion of molecules down their concentration gradients. 28) A bacterium engulfed by a white blood cell through phagocytosis will be digested by enzymes28) contained in A) secretory vesicles. B) lysosomes C) peroxisomes D) Golgi vesicles. E) vacuoles 29) 29) Which of the following statements concerning bacteria and archaea cells is correct? A) DNA is present in the mitochondria of both bacteria and archaea cells. B) Archaea cells contain small membrane-enclosed organelles; bacteria do not. C) Archaea cells contain a membrane-bound nucleus; bacteria do not D) DNA is present in both archaea cells and bacteria cells. 30) A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively A) mitochondria and chloroplasts. B) chloroplasts and mitochondria. C) peroxisomes and chloroplasts E) mitochondria and peroxisomes. 31 31) Why isn't the mitochondrion classified as part of the endomembrane system? A) Its structure is not derived from the ER or Golgi. B) It is not involved in protein synthesis C) It is a static structure. D) It is not attached to the outer nuclear envelope. E) It has too many vesicles. B-5

Explanation / Answer

Ans 26. E) Primary level.

Explaination:- because primary level of proteins doesnot contain hydrogen bonding in them.

Ans 27. C) to mediate cell to cell recognition.

Ans 28. B) lysosomes.

Ans 29. D) DNA is present in both archaea cells and bacteria cells.

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