Match each major class of protein with the best representative protein from each class. Question 1 options: Aquaporin Actin Adenylate cyclase Histone Pepsin 1. Structural proteins 2. Genomic caretaker proteins 3. Metabolic enzymes 4. Transport proteins 5. Cell signaling proteins Predict the fragments of the following peptide after cleavage by trypsin. DASRTYPECHI Question 2 options: A.) DASR TYPECHI B.) DASRTYPE CHI C.) DASRTY PECHI D.) DAS RTYPECHI 3. Which of the TWO following statements about x-ray crystallography are true? Question 3 options: All atoms scatter x-rays equally. X-ray crystallography is the only technique which can determine the three-dimensional structure of a protein. The basic experimental data are relative intensities and positions of scattered electrons. Only crystallized proteins can be analyzed. The x-ray beam is scattered by the protein sample.
Added by Calvin F.
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Structural proteins provide support and shape to cells and tissues. Actin is a major component of the cytoskeleton, which provides structural support to cells. So, Actin matches with Structural proteins. Show more…
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Consider a protein that consists of one polypeptide chain with two alpha helices and a beta pleated sheet. Which of the choices below describes the tertiary structure of this protein? Select one: a. The overall shape of the protein b. An alpha helix c. The linear sequence of building block molecules d. There is no tertiary structure to this protein Which statement is FALSE for mitosis but TRUE for the first round of meiosis? Select one: a. Preceded by an S-phase b. Homologous chromosomes pair up c. Spindle fibers move chromosomes toward a metaphase plate d. Sister chromatids are separated e. Daughter cells are 'clones' of the parent cell Which of the following must use proteins to assist their movement across a cell membrane? Select one: a. Oxygen (O2) b. Carbon dioxide (CO2) c. Sodium ions (Na+) d. Sugars e. C and D
Adi S.
Which of the following is NOT a function of proteins? a) transport of ions and small molecules b) provide structural rigidity through the formation of coils of α-helices c) to elicit an immune response or initiate signaling pathway d) to serve as cofactors for enzymes e) none of the above (all are functions of proteins) 2. Carbohydrates are made up of what type of monomers? a) amino acids b) polyhydroxy aldehydes c) polyhydroxy carboxylic acids d) no defined monomers but contain large hydrophobic regions e) both b and d 3. Which of the following are functions of nucleic acids? a) catalyze anabolic reactions in fatty acid synthesis b) transmission and storage of genetic information c) serve as cofactors for enzymes d) all are correct e) b and c are correct 4. Which of the following are biological functions of lipids? a) energy storage b) formation of the cell membrane c) antioxidants d) all are functions of lipids e) signaling molecule (hormones) 5. Which of the following are functions of carbohydrates? a) they serve as a structural component of DNA and RNA b) provide a source of energy c) provide insulation and buoyancy d) both b and c are correct e) none of the above
Match the following levels of protein structure with their appropriate definition or description: This level of structure occurs when multiple subunits - each an independent polypeptide chain - combine by non-covalent interactions to make a functional protein. This level of structure is a listing of amino acids in order from amino to carboxyl terminus. This level of structure is maintained by interactions between atoms found in the side-chains ("R-groups") of amino acids. This level of structure is composed of either alpha-helices or beta-sheets. Which of the following statements is TRUE regarding bonds in polypeptides? Select one: a. Double bonds stabilize secondary structures. b. The alpha carbon bonds are all polar. c. The double bond between C=N leads to a trans conformation. d. Peptide bonds allow free rotation of each amino acid relative to the others.
Anand J.
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