In a living organism, what is an organ?
A. the shell or skin of an organism
B.
a group of similar cells that perform a common function
C. functional unit, or building block, of all organisms, smallest unit that can carry on the activities of life
D. a structure composed of a number of tissues that work together to perform a specific task

Which of the following processes does the body not use protein to perform? a. repairing muscles b. producing hormones c. making hemoglobin d. creating amino acids

What is the main structural difference between enveloped and nonenveloped viruses? a) enveloped viruses have their genetic material enclosed by a layer made only of protein.b) nonenveloped viruses have only a phospholipid membrane, while enveloped viruses have two membranes, the other one being a protein capsid.c) enveloped viruses have a phospholipid membrane outside their capsid, whereas nonenveloped viruses do not have a phospholipid membrane.d) both types of viruses have a capsid and phospholipid membrane; but in the nonenveloped virus the genetic material is between these two membranes, while in the enveloped virus the genetic material is inside both membranes.

During polarizacion potassium has a blank charge sodium has a blank charge and calcium has a blank charge