Ions diffuse across membranes through specific ion channels down _____
A) their chemical gradients
B) their concentration gradients
C) the electrical gradients
D) their electrochemical gradients
D
Biology & Microbiology
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Which of the following is not true of DNA?
A) It is acidic. B) It contains deoxyribose. C) It is found in cell nuclei. D) It contains phosphate. E) It contains amino acids.
Biology & Microbiology
The first hormone discovered was
a. insulin. b. gastrin. c. secretin. d. thyroxine. e. estrogen.
Biology & Microbiology
Imagine that you are a red blood cell. Describe your "Trek Through the Heart" from when you enter until you finally exit. (Hint: You enter the right atrium. What next?)
What will be an ideal response?
Biology & Microbiology
Marine microbes inhabit sediments on the ocean floor at a depth of up to at least ________.
A. one foot B. 100 feet C. 0.6 kilometers D. ten feet
Biology & Microbiology