Exam 3: Cellular Structure, Proteins, and Metabolic Pathways

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

All proteins exist in the cell for the same length of time before being destroyed.

A clinical disease that results in an inability to absorb fats will not result in malnutrition.

Cell A is a gland cell that makes and secretes proteins.Cell B is another type of cell that synthesizes and secretes steroids.If you were to look at electron micrographs of the two cells,what differences would you expect to see?

In skeletal muscle,when calcium binds to the regulatory protein troponin,it increases the affinity of neighboring troponin molecules for calcium.This is an example of

The term "metabolism"

The rate-limiting reaction in a metabolic pathway is one that occurs at a faster rate than the other steps in the pathway.

The consequences of mutations are invariably harmful.

Which would be true about the following reaction?   M + N  ↔ Y + Z

In which organelle are carbohydrate chains added to glycoproteins?

Which type of cellular junction would allow glucose molecules to diffuse from the cytosol of one cell to the cytosol of a neighboring cell?

Ribosomes transcribe DNA into RNA.

Which of these covalently modifies proteins by phosphorylation?

Which is TRUE about glycolysis?

Which is NOT true about protein kinases?

Which of the following metabolic pathways can proceed in the absence of oxygen?

The site where most of the ATP is generated in a cell is the

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

Which organelles would you expect to be especially numerous in cells such as muscle cells that have a tremendous demand for energy in the form of ATP?

A solution containing proteins of a particular type is exposed to the same concentrations of ligands X and Y,but the percent saturation of molecule X is greater than the percent saturation of molecule Y.Which is most likely to be a true statement?