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
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Which genes are expressed in Drosophila after pattern formation along the A/P axis has been successfully established?
A. totipotent genes B. bicoid genes C. segment polarity genes D. gap genes E. homeotic genes
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
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
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