Particular receptor tyrosine kinases (rtks) that promote excessive cell division are found at high levels in various cancer cells. her2 is an rtk that is present at excessively high levels in some breast cancer cells. herceptin is a protein that binds to her2 and inhibits cell division. herceptin may be an effective treatment for breast cancer treatment under which of the following conditions
a) if injection of her2 in the patient's cancer cells stimulates cell division
b) if the patient's cancer cells have excessive levels of her2.
c) if the patient's genome codes for the her2
d) if the patient has excessive levels of other rtks in cancer cells

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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.