"cat food, cola, toothpaste," your roommate begins reciting items into the phone as you throw your books in the backseat and get into your car; you're supposed to hit the store on the way home. he continues to list a few more items. finally, he wraps up: "coffee creamer, spaghetti sauce, dish liquid, and ice tea mix." you forget a couple of things, but you do manage to get the cat food, cola, and toothpaste. your memory for these items reflects the effect.

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.