Before a stoma opens:a
the level of carbon dioxide inside the leaf increases.
b. potassium ions are actively transported out of guard cells.
c. potassium ions are actively transported into guard cells.
d. the turgor pressure inside the guard cells decreases.
e. water moves by osmosis out of the guard cells.
C
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A controlled experiment is one in which ________.
A. there are at least two groups, one differing from the other by two or more variables B. there are at least two groups, one of which does not receive the experimental treatment C. the experiment is repeated many times to ensure that the results are accurate D. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
If the duration of life on Earth was on a comparative scale of 20,000 days, for how many of those days would the human species be present?
A. 1 B. 100 C. 2000 D. 10,000 E. 20,000
What genetic phenomenon might a 2:1 phenotypic ratio indicate?
A) additivity B) codominance C) complete dominance D) recessive epistasis E) recessive lethal
The accompanying figure is a micrograph of what kind of tissue?
a. cardiac muscle b. skeletal muscle c. nerve tissue d. cartilage e. dense connective