51. Which of the following substances could be a cofactor? A) a ribosome B) a po
ID: 273120 • Letter: 5
Question
51. Which of the following substances could be a cofactor? A) a ribosome B) a polypeptide C) a protein D) a carbohydrate E) None of the above. 52. Which statement regarding microtubules is FALSE? A) Astral microtubules assist in cellular division by pulling sister chromatids apart B) Kinetochore C) The centrosome is an example of an MTOC. D) Interpolar microtubules play no role in cellular division. E) There is more than one false statement above. microtubules attach to chromosomes at proteins called kinetochores. 53. Aquaporins: A) cannot be denatured. B) can move water molecules against their concentration gradient. C) are integral proteins. D) are proteins composed of only polar amino acids E) None of the above. 54. A parental cell that contains 24 pg of DNA must contain Pg of DNA when Fill in the blanks with the answer choices that correcthy complete the sentence A)48; the cell is in S phase B) 12 ; the cell completes meiosis I C) 24; the cell is in prophase D) 24;the cell is in interphase E) None of the above. A solute enters a cell through secondary active transport. Based on this information you KNOW: A) The solute is moving against the concentration gradient. B) The solute is moving down the concentration gradient C) The solute cannot enter the cell any other way D) The solute could not enter the cell this way in the absence of ATP hydrolysis. E) None of the above.Explanation / Answer
51. None of the above. A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's activity.Cofactors can be considered "helper molecules" that assist in biochemical transformations. The rates at which these happen are characterized by enzyme kinetics.
52. There is more than one flase statement.
Interpolar microtubules play a role in cell division.
Astralmicrotubules involved in determining the cell division site based on the geometry and polarity of the cells.
53. Aquaporins, also called water channels, are integral membrane proteins from a larger family of major intrinsic proteins that form pores in the membrane of biological cells, mainly facilitating transport of water between cells.
54. option B
55.While secondary active transport cosnume ATP to generate the gradient down which a molecule is moved, the energy is not directly used to move the molecule across the membrane
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