1. In the formation of the secondary structure of a protein, which of the follow
ID: 270130 • Letter: 1
Question
1. In the formation of the secondary structure of a protein, which of the following are most responsible for holding an alpha-helix region in its helical form? (A) lonic bonds (B) Hydrogen bonds (C) Disulfide bonds D) Hydrophobic interactions (E) van der Waals interactions 2. Separation of molecules according to si (A) Gel-filtration chromatography (8) lon-exchange chromatography (C) Affinity chromatography (D) Isoelectric focusing (E) X-ray diffraction 3. Which of the following pathways is most likely taken by newly synthesized histones? (A) Rough endoplasmic reticulumGolgi complex-secretory vesicle (B) Rough endoplasmic reticulum >Golgi complex->nucleus (C) Rough endoplasmic reticulum->smooth endoplasmic reticulumnucleus (D) Cytoplasm nucleus (E) Cytoplasm >rough endoplasmic reticulum >Golgi complex-2nucleus ze can be achieved by which of the following? 4. How many different types of gametes could be produced by an individual with the arbitrary genotype of AAbbccDdEe? (A) Two (B) Four (C) Six (D) Eight (E) More than eight 5. Which of the following best explains how the activity of an enzyme is regulated by an allosteric inhibitor? (A) Direct competition between the binding of the inhibitor and the binding of a substrate to the active site (B) Induction of a conformational change in the enzyme by the inhibitor, which affects enzyme activity (C) Itrreversible binding of the inhibitor to the enzyme, which affects enzyme activity (D) Inhibition of the transcription of the gene encoding the enzyme by the inhibitor (E) Denaturation of the protein induced by binding of the inhibitorExplanation / Answer
1. B) Hydrogen bonds
The secondary structure of protein (alpha helix and beta pleated sheets) are held together by Hydrogen bonds.
2. A. Gel filtration Chromatography
Also known as size exclusion chromatography.
3. D. Cytoplasm to nucleus
4. B. Four
Gametes: AbCDE, AbCDe, AbCdE, AbCde
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