Recall that C4 plants tend to have higher rates of photosynthesis compared to C3 plants (under normal 21% O2 atmospheric conditions). If photosynthetic rates are higher, why aren't all plants C4 plants?
A. Because of the need to regenerate PEP,
C4 photosynthesis utilizes more energy vs.
C3 photosynthesis.
B. Because of rubisco, C4 photosynthesis
utilizes more O2 vs. C3 photosynthesis.
C. Because of mesophyll cells, C4
photosynthesis requires more chlorophyll.
D. Because of leaf veins, C4 photosynthesis
requires more H2O.
A
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Why is there an upper limit to the surface area-to-volume ratio in a cell?
a. The volume of the cell maximizes the use of phospholipids. b. The surface area must be sufficient to provide adequate nutrient and waste exchange to sustain the chemical activities of the cell. c. The cells require a balance between endocytosis of precursor molecules to transporters in the membrane. d. The size of a cell is limited by the number of mitochondria. e. The organelles in cells require communication with the extracellular environment to support internal functions.
The woman scientist who made a major contribution to the discovery of the structure of DNA was
_____________________. Fill in the blank(s) with the appropriate word(s).
Fern sperm are ________, which is why ferns are dependent on water for reproduction
A) amoeboid B) ciliated C) flagellated D) None of these
Scientists currently identify three domains: plants, animals, and bacteria
Indicate whether the statement is true or false