pe Directions- Indicate whether the statement is True (A) or False (B) on your s
ID: 150679 • Letter: P
Question
pe Directions- Indicate whether the statement is True (A) or False (B) on your scant sheet. Quiz is due Wed. Oct 3d just before our first exam 1. Primary structure of a protein is genetically controlled. 2. Secondary structure of a protein is a polypeptide. 3. Peptide bonds are between carbon and sulfur 4, Secondary structure of a protein is a helix. 5. Tertiary structure of a protein causes globular proteins. 6 Quaternary structure or a protein must contain 4 polypeptide chains. 7. Denaturation of a protein leads to temporary disruption of protein structure. 8. Enzymes speed up chemical reactions. 9. Enzymes are lipid in nature. 10. Enzymes interact with substrates. 11. Prokaryotes have no nucleus. 12. Animal cells are eukaryotes. 13. Plasma membranes are lipid bilayers. 14. Ribosomes are found in the nucleus. 15. Rough endoplasmic reticulum has ribosomes and is involved in protein synth 16. Smooth ER has no ribosomes on it 17. Centrioles are found in plant and animal cells. 18. The golgi apparatus refines, packages and ships macromolecular products. 19. Cilia and flagella are specialized for cell movementExplanation / Answer
1. True, because primary structure is based on the nucleotide bases of RNA and DNA.
2. False, secondary structure of protein is not a polypeptide alone but the one which is folded to form helix or sheets.
3. False, because peptide bonds are between carbon and nitrogen.
4. True, because secondary structure occurs in two forms a) alpha helix and b) beta pleated sheets
5. True, because globular proteins are outcome of tertiary structure.
6. False, Quarternary structure should have more than one polypeptide chains, it may be 2,3 or 4.
7. True, Denaturation breaks the hydrogen bonds, hydrophobic interactions etc, which disrupts secondary and tertiary protein structure.
8. True, Enzymes are biocatalysts and speed up chemical reactions by lowering the activation energy.
9. False, Enzymes are proteinaceous in nature. Some are RNA molecules as well but never lipids.
10. True, Substrates are the reactants of enzyme catalysed reactions.
11.True, prokaryotes do not have nucleus, they have nucleoid which contains their genome.
12. True, all animal cells are eukayotic and belong to Eukarya domain.
13. True, plasma membrane are composed of lipid bilayers
14. False, Ribosomes are present in the cytroplasm
15. True, Rough Endoplasmic Reticulum have ribosomes on their surface and protein synthesis occur on it.
16. True, Smooth Endoplasmic Reticulum lacks ribosomes
17. False, Centrioles are present only in animal cells
18. True, Golgi apparatus are involved in packaging and transport of proteins and lipids which have been synthesized in the cell
19. True, cilia and flagella aare involved in cell movement.
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