One advantage that enabled the seed plants to greatly surpass the ferns in colonizing the land was the evolution of
A) spores.
B) photosynthesis.
C) sex without swimming sperm.
D) a fibrous root system.
E) a woody stem.
C
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Which type of solution will have a high overall solute concentration? a. Balanced b. None of these choices
c. Isotonic d. Hypertonic e. Hypotonic
Lactose is a disaccharide found in milk. What makes some people "lactose intolerant" as adults?
A) Some people don't produce any enzymes, including the one needed to digest lactose. B) Lactose can only be digested by people who produce enough lipase to digest it. C) Lactose-intolerant people don't produce adequate amounts of lactase. D) The active site of the lactose-digesting enzyme can vary from person to person.
According to IPCC predictions, the effects of climate change will be the most extreme in which of the following areas over the next century?
a) Polar areas b) The tropics c) Deserts at 30o latitude d) Climate change effects will be the same across the globe.
Gene that codes for a protein that ordinarily suppresses the cell cycle; inactivity due to a mutation can lead to a tumor.
What will be an ideal response?