Tropical forests make up 6 percent of total land mass but contain an estimated ________ of all species on Earth
A) 1 percent
B) 6 percent
C) 50 percent
D) 90 percent
C
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Which of the following stain as either Gram-positive or Gram-negative?
a. Archaea b. Bacteria c. Archaea and Bacteria d. neither Archaea nor Bacteria e. Methanogens
Which of the following is the first step of the scientific method?
a. Making an observation b. Asking a question c. Forming a hypothesis d. Making a prediction
An important part of maintaining homeostasis is regulating the amount of water released or absorbed by the body. Which two systems mainly work together to perform this function?
a) circulatory and respiratory systems b) digestive and excretory systems c) digestive and respiratory systems d) circulatory and digestive systems
Some organisms are capable of orchestrating alterations that are collectively termed antigenic variation. This allows the organism to __________.
A) rapidly move through the host's tissues B) drastically decrease its ID50 C) enter the host's body through more than one portal of entry D) evade the host's immune system