Why does red and blue light support the highest rates of photosynthesis?
a. These wavelengths activate ATP synthase.
b. These are the only wavelengths reaching Earth from the sun.
c. These are the only wavelengths that carotenoids cannot absorb.
d. These wavelengths have the highest energy in the visible spectrum.
e. These wavelengths are absorbed by chlorophyll more than any other wavelength.
e
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_____ tissues are sheetlike with one free surface
a. Epithelial c. Nervous b. Connective d. Muscle
The production of pollen, seeds, and flowers attributed to the widespread distribution of angiosperms. Why is the production of pollen an advantage?
A. It allows fertilization in the absence of water. B. It allows fertilization in moist areas. C. It promotes pollination. D. It is necessary for sexual reproduction. E. It protects and nourishes the embryo.
A single cell in a smoker's lung has become cancerous. It doubles its DNA and divides much faster
than a normal lung cell. The most likely change that would have caused this condition took place inthe:a. nucleus. b. nucleolus. c. microtubule. d. mitochondria. e. lysosome
What is the maximum number of hydrogen atoms that can be covalently bonded in a molecule containing two carbon atoms?
A) 2 B) 4 C) 6 D) 8