Which of the following BEST defines diffusion?
a) net movement of particles from areas of high concentration to ears of low concentration
b) net movement of particles from areas of low concentration to areas of high concentration
c) net movement of particles between cells
d) net movement of particles from a cell into the extracellular matrix
e) net movement of fluids from the environment into and out of an organism
Answer: a) net movement of particles from areas of high concentration to ears of low concentration
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When pair-rule genes and segment-polarity genes are mutated, larvae display disturbances in segmentation patterns
A. true B. false
What piece of the ATP synthase contains the channel for H+ to flow through?
a. the basal unit b. the headpiece c. the stalk d. the lollipop e. the three catalytic sites
Triglycerides are composed of ________ and ________
a. three fatty acids / one glycerol b. four fused hydrocarbon rings / hydroxyl groups c. three glycerols / one fatty acid d. a hydrophilic head / two hydrophobic tails
In 1932, researchers Emerson and Arnold showed that the rate of photosynthesis saturated at a lower light intensity than expected for the number of individual chlorophyll molecules. From this observation they determined
A. that pigments were clustered in photosystems and they were measuring saturation of pigments in reaction centers. B. that high light intensities destroyed most pigment molecules. C. that they had overestimated the number of chlorophyll molecules present in their test organism. D. that plants must be able to fix carbon before their pigments can absorb light.