Flatworms
a. are radially symmetrical.
b. possess a body cavity.
c. reproduce by parthenogenesis.
d. have tissues derived from all three primary germ layers.
c
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In a cell membrane, the phospholipid heads are
a. hydrophobic b. nonpolar c. dissolved in the cell’s water d. sandwiched between the phospholipid tails e. formed by fatty acids
CO2 and H2O will not form glucose on their own because ____
a. CO2 does not contain sufficient energy b. H2O does not contain sufficient energy c. neither CO2 nor H2O contain sufficient energy d. the concentration of CO2 is too low in the atmosphere e. the bonds of CO2 and H2O are too stable to be broken without an input of energy
When a neuron is not transmitting an impulse, the energy resulting from the level of membrane polarization is called
A. the action potential. B. threshold. C. the resting potential. D. depolarization.
The ________ is the layer of cell wall material shared between adjacent plant cells
Fill in the blank with correct word.