Why can oxygen diffuse across a cell membrane but a protein cannot?

A) proteins are too large.

B) oxygen is polar.

C) oxygen is a gas.

D) proteins absorb oxygen

The two categories of controlled muscles are involuntary and: a: voluntary b: automatic

What vessels connect to the kidney

The flounder is a species of fish that can live in very cold water. the fish produces an "antifreeze" protein that prevents ice crystals from forming in its blood. the dna for this protein has been identified.

Which part of an amino acid has the greatest impact of the overall structure of a protein? A. the amino groupB. the R groupC. the carboxyl groupD. both A and C

A student postulated that the sodium pump directly causes action potentials along neurons. Is this hypothesis reasonable? A) No; action potentials result in increased permeability of the plasma membrane to sodium.

When you look out the window, you can see constantly moving air. air is cycled in order to reach equilibrium. B) since these change the density of air and we know the air flows from the region of high density to the region of low density.

What effects do deforestation have on the animals?

Which best defines a diploid cell during meiosis? a cell that has double the number of chromosomes as the parent cell a cell that has half the number of chromosomes as the parent cell a cell that has double the number of chromosomes as the daughter

What is the best definitionof magnetosphere? a. a magnetosphere is a magnetic field around earth. b. a magnetosphere is the groups of atoms that are lined up inside a magnet. c.

True or false: tertiary sources can draw from, or summarize, a secondary source.