What cell structure does Neisseria gonorrhoeae use to attach and enter host epithelial cells?
A) fimbriae
B) flagella
C) M proteins
D) capsules
E) cell wall waxes
Ans: A) fimbriae
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During replication, which enzyme unwinds the DNA double helix?
A. DNA primase B. DNA polymerase I C. DNA helicase D. DNA gyrase E. DNA ligase
Gene families are composed of homologous genes that have different evolutionary origins but the same function
Indicate whether the statement is true or false.
Most of Earth's water resides in
A) the oceans. B) the polar ice caps and glaciers. C) freshwater lakes, ponds, rivers, and streams. D) groundwater.
You purchase a black dog (B = black, b = brown; B is dominant to b) from a breeder who tells you that the dog is a purebred, and that she will forward its papers to you at a later date
You mate the dog with a brown dog of the same breed. If the dog you purchased was truly a purebred animal, what proportions of colors should you see in the offspring? A) 100% black B) 100% brown C) 50% black, 50% brown D) 25% black, 75% brown E) 75% black, 25% brown