Imagine you were ‘building’ a plant. You wanted a particular tissue to be somewhat rigid but capable
of rapid growth. What tissue type would you pick? What will be an ideal response?
Parenchyma are capable of rapid growth but are not rigid. Sclerenchyma are rigid, but dead at
maturity and therefore cannot grow. The best choice would be collenchyma, which have thick walls
for rigidity but are alive at maturity and can grow.
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Membrane fluidity is affected by
A. temperature, cholesterol, types of fatty acids. B. size of molecules, polarity of molecules, temperature. C. types of fatty acids, waters affinity for hydrogen bonding. D. hyrophillic tails, hydrophobic heads, cholesterol.
Which of the following substances may diffuse through the lipid bilayer of the plasma membranes of
brain capillaries and enter the brain? a. nicotine b. caffeine c. alcohol d. barbiturates e. all of these
The gene of an operon that codes for a protein repressor is called the
A) Operator B) Regulator C) Promoter D) Structural locus
Plants produce large amounts of ________ that serve as an _____________
Fill in the blank(s) with the appropriate word(s).