The following represents a portion of one half of a DNA strand: TCGAAGTC. Which of the following represents a single mutation in this portion of DNA?
a. AGCTTCAG
b. TCGTAGTC
c. UCGAAGUC
d. ACGUUCAC
B
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The first hormone discovered was
a. insulin. b. gastrin. c. secretin. d. thyroxine. e. estrogen.
Which organelle can be considered a sorting, processing and packaging center?
a. vacuole b. centriole
c. centrosome d. Golgi complex e. endoplasmic reticulum
When do opportunistic pathogens tend to cause disease?
A) when the host is young B) when the host didn't wash with soap C) when the host is weakened D) after the host is already infected with a different pathogen E) when the host is old
Yaws is a serious skin disease of children in tropical countries, caused by Treponema pertenue, a species closely related to the bacteria that cause syphilis. Individual cells of T. pertenue are helical, relatively long, and flexible like the one pictured below. These cells are known as _____.
Fill in the blank(s) with the appropriate word(s).