Pores on the leaf surface that function in gas exchange are called
a) stomata.
b) hairs.
c) sclereids.
d) xylem cells.
e) phloem cells.
Answer: a) stomata.
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Pemphigus vulgaris is an autoimmune disorder in humans in which antibodies are produced against the cadherins of desmosomes. The blistering of the skin and mucous membranes characteristic of this disorder is probably a result of _____
A) a decrease in flexibility of the cell membrane B) an inadequate number of G-protein receptors C) inadequate production of cytoskeletal proteins D) a loss in cell-cell adhesion
Which of the following is in the correct order for one cycle of polymerase chain reaction (PCR)?
A) Denature DNA; add fresh enzyme; anneal primers; add dNTPs; extend primers. B) Add fresh enzyme; denature DNA; anneal primers; add dNTPs; extend primers. C) Anneal primers; denature DNA; extend primers. D) Extend primers; anneal primers; denature DNA. E) Denature DNA; anneal primers; extend primers.
Which of the following is a kingdom within the domain Eukarya?
A ) Viruses B ) Monera C ) Fungi D ) Archaea E ) Bacteria.
Which of the following statements is false?
A. tissues exist within organs which exist within organ systems B. communities exist within populations which exist within ecosystems C. organelles exist within cells which exist within tissues D. communities exist within ecosystems which exist in the biosphere