E. coli is propelled by ____
a. rotating bundles of pili
b. a single cilium
c. a single flagellum
d. rotating bundles of cilia
e. rotating bundles of flagella
ANSWER: e
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You are studying genes in yeast and find that the genes can be placed into four groups that tend to be inherited together. From this you can conclude that yeast
A. have four chromosomes. B. have four loci. C. have four alleles. D. have four genes. E. produce four cells during meiosis.
The genetic code is said to be degenerate. What does that mean?
What will be an ideal response?
Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,
A. monophyletic. B. paraphyletic. C. a kingdom. D. polyphyletic. E. a supergroup.
Herpes simplex-2 (HSV-2) causes
A. infection in neonates that have contact with lesions in the birth canal. B. genital lesions. C. intensely sensitive vesicles on or near the genitals. D. symptoms that include urethritis, cervicitis, and itching. E. All of the choices are correct.