Four of the five choices listed below can help a plant

wall off threats. Select the exception.
a. centralized mechanisms
b. phenols
c. resins
d. compartmentalization
e. defensive compounds


Answer: a

Biology & Microbiology

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Which genes are expressed in Drosophila after pattern formation along the A/P axis has been successfully established?  

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The ___ Echinoderm lineage is made up of brittle and basket stars, each with elongated, slender, somewhat snakelike

arms surrounding a well-defined central disk.

a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea

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What functions do proteins perform?

a. as catalysts in chemical reactions b. in gene regulation c. in structural and mechanical support d. all of the above

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Water can maintain a constant temperature better than some other liquids because _____

1.hydrogen bonding keeps the water molecules from moving around too much 2.cohesion forms a seal that keeps heat out 3.heat is generated by ions and there are few ions in water 4.covalent bonds remove energy from the system and keep water cool

Biology & Microbiology