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

Biology & Microbiology

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The head of a sperm contains the

A) cell membrane. B) cytoskeleton. C) DNA. D) testosterone.

Biology & Microbiology

Which of the following substances is released

by an endocrine gland?

a. mucus b. hormones c. saliva d. milk e. tears

Biology & Microbiology

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.

Biology & Microbiology

A difference in charge across a guard cell membrane is called ____.

A. osmosis B. tension C. turgor D. pressure gradient E. voltage

Biology & Microbiology