A malignant tumor is more dangerous than a benign tumor because ______________________
(a) its cells are proliferating faster.
(b) it causes neighboring cells to mutate.
(c) its cells attack and phagocytose neighboring normal tissue cells.
(d) its cells invade other tissues.
(d)
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____ are produced by B cells and possess antibodies attached to their cell surfaces. The cells play a pivotal role in the secondary immune response
Fill in the blank with the appropriate word.
Plasmids are small, circular, supercoiled DNA molecules found in some bacteria. They usually do not carry essential genes, but some plasmids, such as R (resistance) plasmids, carry genes coding for antibiotic resistance. All plasmids have their own origin of replication, so that they are replicated along with the host chromosome and passed along to progeny cells. Only some plasmids possess genes that allow for transmittal to other bacteria by the process of conjugation.
a. true b. false
Compared with modern humans, Neanderthals had all the following features except:
A. Tall, thin body B. Stockier build C. Thicker bones D. Bulkier muscles E. Shorter stature
___________ are carnivores.
a) Primary consumers b) Primary producers c) Secondary consumers d) Decomposers