The evolution of cell membranes

Assignment Help Biology

Reference no: EM13526769

1. Which of the following is true of the evolution of cell membranes?

A) Cell membranes cannot evolve if proteins do not.
B) The evolution of cell membranes is driven by the evolution of glycoproteins and glycolipids.
C) An individual organism selects its preferred type of cell membrane for particular functions.
D) As populations of organisms evolve, different properties of their cell membranes are selected for or against.
E) Cell membranes have stopped evolving now that they are fluid mosaics.

2. Of the following functions, which is most important for the glycoproteins and glycolipids of animal cell membranes?

A) facilitated diffusion of molecules down their concentration gradients
B) a cell's ability to distinguish one type of neighboring cell from another
C) maintaining membrane fluidity at low temperatures
D) active transport of molecules against their concentration gradients
E) maintaining the integrity of a fluid mosaic membrane

3. Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

A) CO2
B) an amino acid
C) K+
D) starch
E) glucose

Reference no: EM13526769

Questions Cloud

What is the role of the ninth triplet : For each mutant protein, determine the specific ribonucleotide change that led to its synthesis. The wild-type RNA consists of nine triplets. What is the role of the ninth triplet? For the first eight wild-type triplets, which, if any, can you deter..

In a biochemical pathway-endergonic reactions : In a biochemical pathway, three ATP molecules are hydrolyzed. The endergonic reactions in the pathway require a total of 17.3 kcal/mole of energy to drive the reactions of the pathway. What is the overall change in free energy of the biochemical path..

In the f2 generation : In the f2 generation, how many genotypic classes could be generated from a dihybrid cross of two heterozygotes in which the genes involved show complete dominance?

Photosynthesis into specialized cells in the veins of leaves : In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. What mechanisms do plants use to load sucrose produced by photosynt..

The evolution of cell membranes : Which of the following is true of the evolution of cell membranes? Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

In the diversity and abundance of bacteria : In the diversity and abundance of bacteria, we always have some uncertainty about the identity of an isolate. With this in mind, how can we be certain that growth with a metallic sheen is truly a coliform bacterium?

Design diagnostic test to distinguish mutant allele : I want to design a diagnostic test to distinguish a mutant allele from a wild type allele, as in the two allele depicted below. I have the choice of using two restriction enzymes (A and B) with target sites marked by the placement of A and B on th..

Lysing the red blood cells releases the hemoglobin : You suspect that Michael has sickle cell anemia and you have ordered an isoelectric focusing analysis of the child’s lysed red blood cells. (Lysing the red blood cells releases the hemoglobin.) Draw a diagram of the predicted results. Why will this t..

The bacterium helicobactor pylori naturally grows in human : The bacterium Helicobactor pylori naturally grows in human and animal stomachs at pH about 2. It will grow also at pH 2 and pH 7 in culture media. It's genome sequence has been determined and annotated.

User Account

All Pages