2. Cell Chemistry & Cell Components

What are the two basic types of secondary structure in proteins?

Different proteins are composed of different sequences of .a. sugars;b. lipids;c. fats;d. amino acids;e. carbohydrates

Which of the following statements is incorrect regarding protein structure?

If a cell were to use only 10 of the 20 possible amino acids, how much effect would you expect this to have on protein diversity? Calculate and compare the number of different sequences that can be generated by randomly assembling either 10 or 20 amino acids into peptides that are five residues long.

Which of the following proteins are synthesized by bound ribosomes?

Which of the following is correct about protein folding?

Why are proteins not considered to be a good candidate for the first living molecule?a. Their catalytic capability is not sufficient for most biological reactions.b. Their amino acid monomers were not likely present in the prebiotic soup.c. They cannot serve as a template for replication.d. They could not have polymerized from amino acid monomers under early Earth conditions.

The "primary structure" of a protein refers to __________.

Which of the following represents a specific description of a polypeptide?

Explain how molecular chaperones facilitate protein folding in many different polypeptides, each with their own specific shape.

The α helix and β pleated sheet represent which level of protein structure?

What type of bond is directly involved in the formation of an α-helix?a. peptide bonds between amino acid residuesb. hydrogen bonds between amino acid residuesc. van der Waals interactions between nonpolar residuesd. disulfide bonds between cysteine residues