The pH of your stomach is between 1 and 3. Use your knowledge of polar and nonpolar substances to explain why
the acids in your stomach do not alter the pH of your blood.
What will be an ideal response?
ANSWER: Cells are comprised of a lipid bilayer that excludes hydrophillic substances, including acids.
The cells lining the inside of the stomach prevent the acid from moving across the cell
membrane into the blood stream.
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Phytophthora infestans is a pathogen that attacks a variety of plants. This pathogen is an example of what type of protist?
A. algae B. fungus-like protists C. protozoans D. periphyton E. plankton
Bones in fingers or toes are called
a. hyoid. b. patella. c. scapula. d. clavicle. e. phalanges.
Which of the following is LEAST associated with the others?
A) horizontal gene transfer B) conjugation C) transformation D) binary fission
Why was ATP a primary molecule in connecting energy-releasing and energy-requiring reactions in early cells?
a. because it was the only molecule available to transfer energy b. because of its versatility and efficiency in transferring energy c. because of its structure d. because of its attraction to energy