Which cells form the protective coat around seeds?
a. vessel members cells
b. collenchyma cells
c. parenchyma cells
d. sclerenchyma cells
Answer: d. sclerenchyma cells
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Which of the following do sticky ends and nucleic acid probes have in common?
A. They both are used as gene vectors in genetic engineering. B. They both involve complementary base pairing. C. They both are parts of RNA molecules. D. They both are produced by the action of restriction enzymes. E. They both are important aspects of bacterial sex.
Which of the following produces the secondary tissues of trees?
a. Sapwood b. Cork c. Vascular cambium d. Heartwood e. Cortex
Which biome probably contains the largest number and most diverse group of large mammals?
A) Savanna B) Tropical rain forest C) Desert D) Tropical deciduous forest E) Chaparral
What is the MOST abundant prokaryote in the ocean?
a. Pelagibacter b. Prochlorococcus c. Roseobacter d. Trichodesmium