The shape of the needlelike leaves of pine trees is a specialization that helps the tree ________
a. conserve water
b. receive light to all leaves
c. deter plant-eating insects
d. maximize gas exchange
a
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When yeast cells of the "a" mating type are exposed to a solution of "? pheromones
A) those yeast cells will undergo cell division B) actin filaments will form a cleavage furrow in the yeast cells C) the yeast cells will fuse with each other D) G proteins will be activated in the cell signaling pathway and the yeast cells will change shape E) those yeast cells will undergo DNA replication
Which of the following statements about protists is false? a. Protists constitute a monophyletic group
b. Some protists are more closely related to plants, fungi, or animals than to other protists. c. Some protists are multicellular and have differentiated cells. d. Certain protists can function both as autotrophs and heterotrophs.
Epidermolysis bullosa is an inherited disorder caused by mutations in the structural proteins of the ________
a. skin b. muscles c. heart d. brain
Which of the following methods would be the most suitable to assess the relative purity of a protein in a sample you have prepared?
(a) gel-filtration chromatography (b) gel electrophoresis (c) western blot analysis (d) ion-exchange chromatography