What is meant by the term "fluid mosaic model"?
a. It is the diffusion of lipid-soluble substances through the lipid bilayer.
b. It is the movement of lipids and integral proteins within the lipid bilayer.
c. It is the solubility of water in the membrane.
d. It is the method of substance transport across the membrane.
e. It is the movement of surface proteins through the membrane
B
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Franklin’s work with three-dimensional models was
similar to that of a. Pauling’s. b. Watson and Crick’s. c. Wilkins’. d. Chargaff’s. e. all of these.
An advantage of chorionic villus sampling (compared with amniocentesis) is that:a
chorionic villus sampling detects a much wider range of genetic defects than does amniocentesis. b. chorionic villus sampling is much less expensive than is amniocentesis. c. chorionic villus sampling is much less invasive than amniocentesis. d. chorionic villus sampling is much easier to perform than amniocentesis. e. chorionic villus sampling can be performed much earlier than can amniocentesis.
Totipotent nuclei are capable of:
a. controlling the expression of other genes in the nucleus. b. directing normal development of an organism. c. causing cells to lose the ability to differentiate. d. undergoing unlimited nuclear divisions. e. stopping the cell cycle at will
You discover a new transport system used by a newly discovered bacterial species. The sugars that are transported using this system are phosphorylated as they enter the bacterial cell. You would describe this transport system as a(n) ________.
A. group translocation B. micronutrient regulator C. passive diffusion D. facilitated diffusion