In this cross-section of a typical plant leaf, the are where photosynthesis takes place
A. stomata
B. mesophyll cells
C. air spaces
D. stromata
E. outer epidermis cells
B. mesophyll cells
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The body fluid of sharks has a much lower concentration of sodium chloride than that of the surrounding seawater, and yet they are able to remain in osmotic equilibrium with the external environment. How can this be the case?
A. Sharks store enough urea in their bloodstream to match the total solute concentration of the surrounding seawater. B. Sharks are osmoregulators. C. Sharks maintain high levels of sodium chloride in their skin. D. Sharks drink large volumes of seawater to compensate for the low salt concentration of their body fluids. E. None of the answer options is correct.
In which year does it appear that the climate was most conducive to growth?
a. 2009 b. 2010 c. 2011 d. 2012
Appetizer effect
What will be an ideal response?
Which of the following statements about T lymphocytes is FALSE?
A) T lymphocytes produce antibody molecules. B) T lymphocytes directly attack cells and produce the cell-mediated immune response. C) T lymphocytes are called such because they mature in the thymus. D) T lymphocytes have TCRs that recognize antigen only if it is bound to MHC. E) There are three types of T lymphocytes.