The term angiosperm refers to
A. the narrow sperm of angiosperms.
B. the enclosure of the seed within a fruit.
C. the presence of endosperm.
D. the branching of vascular veins.
E. the presence of pollen.
B. the enclosure of the seed within a fruit.
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Which of the following statements about the physiological responses of plants to increasing temperatures and carbon dioxide levels is false?
A. Many plants devote more resources to reproduction under these conditions. B. Many plants produce flowers earlier in response to increased temperatures. C. Many plants produce leaves earlier in response to increased temperatures. D. The amount of nitrogen in plant tissues declines in response to increased CO2. E. None of the answer options is false.
Which animal has countercurrent heat exchange to retain heat in a cold environment?
A. birds B. whales C. foxes D. bony fish E. bees
Which of the following is the upper tissue layer specialized for photosynthesis in most plant leaves?
a) palisade mesophyll b) cortex c) epidermis d) vascular bundle e) spongy mesophyll
Which of the following is an example of a bacterial cell utilizing a siderophore to collect iron?
A) Hemolytic bacteria collect hemoglobin from host red blood cells and breaks them down to extract iron. B) Bacteria use manganese instead of iron. C) Bacteria collect host iron-binding proteins and breaks them down to extract iron. D) Bacteria produce proteins that degrade host cells and cause the release of iron. E) Bacteria produce proteins that steal iron from host iron-binding proteins.