How is it possible for an enzyme to lower the required energy of activation for a reaction? What will be an ideal response?
ANS:Concepts
to Consider: Specificity of the active site of the enzyme; modification of the chemical
bonds that link the reactants or that form the reactant; changing the state of reactants to make them less
stable
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The head of a sperm contains the
A) cell membrane. B) cytoskeleton. C) DNA. D) testosterone.
Which of the following substances is released
by an endocrine gland?
a. mucus b. hormones c. saliva d. milk e. tears
Which piece of evidence best supports the endosymbiotic theory of organelle evolution?
A. The inner membrane of a mitochondrion and chloroplast resembles a eukaryotic cell while the outer membrane resembles that of a bacterial cell. B. The outer membrane of a mitochondrion and chloroplast resembles a eukaryotic cell while the inner membrane resembles that of a bacterial cell. C. Mitochondria and chloroplasts are much larger than present day bacteria. D. Both mitochondria and chloroplasts divide by mitosis.
A difference in charge across a guard cell membrane is called ____.
A. osmosis B. tension C. turgor D. pressure gradient E. voltage