Which of the following is NOT true of a stress or "fight-or-flight" response?
A. Energy stores such as adipose tissue and glycogen are broken down to mobilize fatty acids and glucose.
B. The heart rate increases and airways are dilated to promote maximum oxygen intake.
C. Elevations in cortisol are needed to increase glucose.
D. Catabolic hormones are activated.
E. Leptin levels are increased to enhance appetite.
E. Leptin levels are increased to enhance appetite.
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If a protein to be overexpressed is toxic to the expression host, it is best to select an expression vector that
A) is compatible with a binary vector able to be regulated. B) is inducible. C) has a relatively low copy number per cell. D) prevents folding of the overexpressed protein into its toxic form.
Which substance is not released by plant roots to enable and improve access to particular nutrients in the soil?
a. amino acids b. carbohydrates c. enzymes d. fatty acids e. carbon dioxide
Due to the molecular interactions between lipids and polar molecules, _____
a. water molecules isolate themselves into droplets when mixed with lipids b. lipids readily dissolve in water c. nonpolar lipids will not interact with water d. polar substances pass through a lipid bilayer more readily than nonpolar substances e. polar molecules embed in the hydrophobic interior of the phospholipid bilayer
What do carbohydrates, lipids, and proteins have in common?
A) All are important enzymes that function within the cell. B) All are inorganic molecules. C) Covalent bonding holds these molecules together. D) Polymers of these organic molecules form monomers via dehydration synthesis reactions.