All angiosperms have
A. animal pollinators.
B. scented flowers.
C. fleshy fruits for dispersal.
D. nectaries.
E. ovules enclosed in carpels.
Answer: E
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What developmental landmark occurs at day 25 in humans?
a. primitive streak b. neural tube c. yolk sac d. pharyngeal arches e. somites
Mucus secreted by mucous membranes provides protection against infections by
A) forcing the pathogen to die in the struggle to free itself (like a fly strip). B) trapping and removing pathogens. C) phagocytosing pathogens by macrophages. D) destroying pathogens by the complement system. E) drowning the pathogen.
Which of the following were used in studies to test and support the hypothesis that high pressure forces phloem sap to flow?
a. radiolabelled sugars b. radiolabelled hormones c. aphids d. vacuum chambers
What is the advantage of genetically modifying crops such as corn, cotton, and potatoes with Bt genes?
A) to make the crops more resistant to insect pests B) to improve the resistance of insect pests to Bt toxins C) to reduce the need for fertilizers D) to stop Bacillus thuringiensis from damaging the crops