While cleaning out the attic, you find a packet of seeds that your grandmother gathered from her garden. You plant them outside, and some of them sprout. What was the condition of these germinating seeds while they were in the attic?
A) The endosperm cells were dead; the embryo cells were alive but inactive.
B) They were dead, but the embryo cells revived in response to water.
C) They were alive and very metabolically active.
D) They were alive but dormant.
Answer: D
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In SCUBA diving, breathing gas, a mixture of oxygen and other gases, is carried in a breathing tank on the diver's back. This gas must be pressurized so the diver can breath underwater; it is not sufficient to simply bring unpressurized breathing gas or normal air underwater. Based on the Fick diffusion equation, what can you conclude about the concentration of oxygen available to the diver underwater?
A. The atmospheric and water pressure increases the amount of oxygen that can be extracted from unpressurized breathing gas. B. The atmospheric and water pressure does not affect the amount of oxygen that can be extracted from unpressurized breathing gas. C. The concentration of oxygen is lower in breathing gas than in normal air. D. The atmospheric and water pressure decreases the amount of oxygen that can be extracted from unpressurized breathing gas.
Which of the following lead(s) to genetic variation in sexually reproducing organisms?
a. the process of meiosis b. the combination of male and female gametes during fertilization c. mutations that occur during development d. the process of meiosis and the combination of male and female gametes during fertilization
Birds are least likely to be attracted to flowers with
a. yellow petals. b. red petals. c. both red and yellow parts. d. strong attractive scents. e. intense red and yellow patterns on petals.
Deoxygenated blood in the right side of the heart never mixes with the oxygenated blood in the left side of the heart
Indicate whether the statement is true or false