18. If a membrane protein forms a channel and allows a polar molecule to cross t

Question

18. If a membrane protein forms a channel and allows a polar molecule to cross the membrane from a side where the molecule has a high concentration to a side where it has low concentration without the use of energy, that process is called A) passive transport B) facilitated transport C) active transport 19. Which of the following is NOT an L-amino acid? D) osmosis E) endocytosis oO NH3 A) coo c D) E) 20. Considering the side chain (R group) oNLY, which of he folowig pairs of amino acids lowing pairs of amino acids have the most similar chemical properties? A) R and G B) D and K C) V and L D) Sand F E) H and F 21. Which of the following amino acids is the most likely to be located on the interior of a globular protein? A) Lysine B) Serine C) Phenylalanine D) Aspartic acid E)Arginine For questions 22 through 24 consider the structure of a peptide shown to the right. 22. What is the identity of the amino acid at the C-terminus of this peptide? A) asparagine B) cysteine C) isoleucine D) leucine E) serine 23. How many peptide bonds are in the peptide? A)1 B)2 C)3 D)4 E)S 24. What color will you observe if this peptide is treated with the biuret agent? A) light blue B) lavender/light purple C) orange D) bright green E) no color 25. What type of bonding maintains -helices and -sheets found in proteins? E) ionic D) hydrogen bonds C) dispersion forces Page 4 of 14 )covalent B) dipole-dipole

Explanation / Answer

Ans 18 : B) facilitated transport

When the solute is transported by the integral membrane protein across the membrane from high concentration to lower concentration, that too without the use of any energy , it is called as facilitated transport.

The active transport requires input of energy and passive transport takes place without channel proteins.

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