Exam 3: Cellular Structure, Proteins, and Metabolism

One striking feature of plasma membrane structure is its symmetry,with the extracellular and cytoplasmic surfaces virtual mirror images of each other.

Most energy in the body is stored in what form?

A ribosome is composed of one molecule of RNA and several proteins.

Removal of the amino group from an amino acid is necessary before the amino acid can be metabolized for energy.

Which of these covalently modifies proteins by phosphorylation?

Once protein synthesis is completed,the protein that was synthesized may undergo further changes prior to its secretion or use within the cell.

During oxidative phosphorylation,hydrogen atoms are passed serially from a coenzyme down a chain of molecules called cytochromes.

Which is a function of transfer RNA (tRNA)?

Fat-soluble vitamins are required for health because they act as coenzymes.

The active site of an enzyme is a functional binding site.

Which is NOT true about cofactors involved in enzymatic reactions?

What codon corresponds to the DNA sequence G-T-A?

Proteins are broken down to amino acids by enzymes called transaminases.

Which is a major function of the plasma membrane?

What is "allosteric modulation?"

Protein channels that link the cytosol of adjacent cells are called ___________ junctions.

The greater the ligand concentration needed to achieve 50 percent saturation of a particular binding site,the higher the affinity of the binding site for that ligand.

Neurons have a very prominent nucleolus which indicates that they are actively performing what function?

A light microscope can be used to view very large proteins in a cell.

The shape of a ligand and the shape of its binding site influence both the specificity and the affinity of binding.