In addition to seeds, which of the following characteristics is unique to the seed-producing plants?
A) sporopollenin
B) lignin present in cell walls
C) pollen
D) megaphylls
C
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As pertaining to the spread of antibiotic resistance in bacteria, which of the following terms is not directly related to the others?
A. Intercalate B. Integron C. Integrase D. Cassette
Cells that are located between the seminiferous tubules of the testis and whose function is to produce androgens are called ________
Fill in the blank(s) with correct word
Do mitosis and meiosis differ in the number of cells produced, and the chromosome complement of each cell?
What will be an ideal response?
Oxygen levels in the photic zone fluctuate over the course of a 24-hour period. If you were measuring dissolved oxygen over the course of the day, when would you expect to see the lowest levels of oxygen and why?
A. Early evening when animals come to feed and disturb the surface waters. B. Early afternoon when the surface water warms up and sinks to the bottom. C. Mid-morning because fish are most active and their respiration rates are highest. D. Mid-afternoon because the activity of the Calvin cycle (the dark reactions) of photosynthesis are at their peak. E. During the night because the light reactions of photosynthesis are inactive.