20. A domain of repeating structures, such as b-pleated sheets and a-helices is

Question

20. A domain of repeating structures, such as b-pleated sheets and a-helices is known as – a. Tertiary structure
b. Primary structure
c. Secondary structure

d. Quaternary structure

19. How are proteins quantified in an SDS-PAGE gel?
a. molecular weights relative to a hydrogen atom in daltons b. the mass of a hydrogen atom
c. in kilobase
d. by charge density

14) Similarities and differences in protein and DNA sequences are being used to create 13)Which of the following are lists of muscle proteins a. Filamin, nebulin, gellsolin
b. titin, geoffolin, M3
c. centerlin, gradeolin, failolin

d. Phylogeneolin, datalin, introlin

12. Hydrolysis of ATP causes myosin and actin filaments to – a. slide past one another
b. shorten the sarcomere
c. contract the muscle

d. All of the above
e. none of the above

Explanation / Answer

1) option A. tertiary structure.

primary str.- amino acid sequence or poly peptide.

secondary str- alpha helix and beta sheet.

tertiary str- combination of secondary structures.

quaternary str- made of 2 or more than 2 polypeptides.

2) option B. Protein size is measured in daltons.One dalton is defined as the mass of a hydrogen atom, which is 1.66 x 10–24 gram.

3) option A. filamin, nebulin, and gelsolin

4) option D. all of the above.

Hydrolysis of ATP causes myosin and actin filaments to slide past one another
shorten the sarcomere
contract the muscle

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