Plant cell walls are primarily composed of
A. protein.
B. chromatin.
C. glycogen.
D. cellulose.
D. cellulose.
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Carolus Linnaeus developed a classification system for organisms based on their DNA sequences
Indicate whether the statement is true or false.
Where does the lens FOCUS an image in the mammalian eye?
a. on the retina, using the entire surface of the retina b. primarily on the fovea c. on the rods only d. slightly in front of the retina, so the neural cells don't distort the image e. it depends on where you are looking; sometimes on the fovea, sometimes elsewhere on the retina
Which BMI range has the lowest relative risk of death?
A) 18-24.99 (normal weight) B) 25-29.99 (overweight) C) 30-34.99 (moderate obesity) D) 35 and above (severe obesity)
Which statement is NOT true about the pressure-flow model of phloem transport?
A. Sugar produced by photosynthesis is actively transported into phloem cells. B. Pressure is created in the phloem by the buildup of water and sugar. C. Sugar is actively transported out of the phloem at a sink area such as the root. D. Water is actively transported into phloem. E. Phloem has been measured moving at a velocity of 1 m an hour.