What is the state of stomata in CAM plants, such as cacti?
a. They are nearly always open.
b. They are open during the day and are closed during the night.
c. They are almost never open.
d. They are open during the night and are closed during the day
Ans: d. They are open during the night and are closed during the day
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Why can a skin test be used to detect an infection associated with the lungs as in the case of TB?
A. Skin is a type of epithelial tissue, just like lung tissue. B. TB exposure can also occur on the skin. C. Memory T cells and B cells are present throughout the immune system. D. All of the answer options are correct.
The average American consumes about ____
pounds of fat per year.
a. 100 b. 80 c. 70 d. 50 e. 20
Plant roots require oxygen to absorb nutrients efficiently
1.True 2.False
Who was the first to discover the process of natural transformation?
A. Morgan B. Sturtevant C. Griffith D. Avery