Chitin is a polysaccharide with __________ atoms
attached to the glucose backbone.
a. magnesium
b. phosphorus
c. potassium
d. nitrogen
e. sulfur
Answer: d
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Answer the following statements true (T) or false (F)
1. Most extremophiles are archaea. 2. A pathogen is a parasitic microbe. 3. Feeding antibiotics to livestock promotes human health. 4. Mitochondria originated from proteobacteria.
What is the photopigment in rod cells called?
A. photopsin B. rhodopsin C. opsin D. carotene E. melanin
Biochemical testing used for identification of pathogens involves each of the following, except
A). inoculation of additional media, incubation, and observation for a color change. B.) quick tests that take just a few seconds. C.) examining organisms through the microscope.
The first eukaryotic fossils are dated to about ____.
A. 2.7 billion years ago B. 1.8 billion years ago C. 1.5 billion years ago D. 750 million years ago E. 201 million years ago