Your immune system has identified some body cells infected with an influenza (flu) virus. Which of the following will the immune system use to destroy these infected cells?
A) Cytotoxic T cells
B) Antigens
C) Phagocytes
D) Antibodies
E) B cells
A
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You are presented with an animal that resembles a jellyfish. As you examine it further, which characteristic would allow you to conclude that it belongs to the Phylum Ctenophora rather than the Phylum Cnidaria?
A. complete digestive tract. B. tentacles. C. gonads. D. stinging cells.
Crossing over is important because it
1.eliminates a bad allele from being in an egg or sperm cell. 2.increases the variation in the DNA of eggs and sperm. 3.increases the number of alleles in the eggs and sperm. 4.changes the alleles for traits on a chromosome.
When a finger or other appendage is severed in an accident, it is possible to surgically rejoin most tissues (bone, skin, etc.), which will then grow and heal. However, a cut through an appendage nerve is currently very difficult to reconnect. What structures are severed when the nerves in an appendage are severed?
A. axons B. interneurons C. cell bodies D. synapses E. dendrites
All of the following are processes that occur during angiosperm reproduction EXCEPT
A) one megaspore degenerates, and the other three divide once to produce the six-celled embryo sac. B) the megaspore mother cell undergoes meiosis to produce four haploid megaspores. C) the tube cell produces the pollen tube. D) the generative cell forms two sperm cells via mitosis. E) the microspore mother cell undergoes meiosis to produce four haploid microspores.