Which one of the following statements about energy is correct?
A. Chemical energy is a form of kinetic energy.
B. A leaf falling from a tree represents potential energy.
C. We convert about 99% of our food energy to useful work.
D. Energy cannot be created or destroyed.
D. Energy cannot be created or destroyed.
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Indicate the ploidy of each of the following cells:A
fungal spores B. sperm C. somatic cells D. cells of a flower petal What will be an ideal response?
Fossil fuels are considered part of the "rock" pool of carbon on Earth. Burning fossil fuels moves that carbon into the atmosphere. Increased carbon in the atmosphere can lead to increased carbon:
What will be an ideal response?
Suppose that a cell has a membrane that is permeable to water but NOT to Na+ or Cl- or any other solute. More NaCl exists outside the cell than inside the cell, and the osmolarity of the cell is higher than that of the solution surrounding the cell. Which of the following should occur?
a. Overall, the cell should lose water and take up Na+ and Cl-. b. Overall, the cell should take up water, Na+, and Cl-. c. Overall, the cell should take up water and lose Na+ and Cl-. d. Overall, the cell should take up water.
Which of the following layers of the epidermis contains cells that provide protection against UV radiation?
a) stratum corneum b) stratum lucidum c) stratum spinosum d) stratum basale