The darker extremities characteristic of Siamese cats and Himalayan rabbits are due to a ________

a. mutation increasing the activity of an enzyme required for melanin production
b. heat-sensitive form of an enzyme required for melanin production
c. mutation inactivating the enzyme required for melanin production
d. mutation making melanin production insensitive to temperature variations


b

Biology & Microbiology

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Four of the following are modern apes. Which is not a modern ape?

a. gibbon b. new world monkey c. chimpanzee d. gorilla e. orangutan

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Sexual reproduction has many benefits from a genetic standpoint. Can you think of any downside to

sexual reproduction? What will be an ideal response?

Biology & Microbiology

Hydrophobic interactions are exhibited with

a. ions. b. nonpolar molecules. c. hydration ions. d. polar molecules. e. none of these.

Biology & Microbiology

Which statement about ion channels and voltage-gated ion channels is true?

A) Voltage-gated ion channels are always open. B) Ion channels allow ions to flow against their concentration gradients. C) Voltage-gated ion channels only open when a stimulus is applied. D) Ion channels do not contribute to resting membrane potential.

Biology & Microbiology