How does a plant's cuticle allow it to live on land?
A. By increasing structural support
B. By preventing the gametes from drying out
C. By preventing water loss
D. By absorbing nutrients from the soil
Answer: C
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What region of a steroid is hydrophilic?
A) the methyl (-CH3) groups B) the terminal hydroxyl group C) the ring structures D) the long hydrocarbon chain
Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the Citric acid cycle, thus preventing further generation of NADH, FADH2 and ATP molecules that are not needed. B. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria. C. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy. D. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase.
In flowering plants, the ____ generation is dominant
a. haploid gametophyte b. diploid gametophyte c. haploid sporophyte d. diploid sporophyte e. triploid endosperm
Many wild orchids cannot be successfully dug up and transplanted because they need the native mycorrhizae (a fungus) in the soil to survive. What kind of interaction is this?
a. parasitism b. herbivory c. mutualism d. competition