A scientist is trying to coax stem cells to differentiate into muscle to use as a therapy for muscular dystrophy. He looks at his Petri dish and is excited to see the cells contracting! The cells appear striated and multinucleate. What type of muscle are they?
A. cardiac muscle
B. involuntary muscle
C. smooth muscle
D. skeletal muscle
Answer: D
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What are the genotypes of the married couple?
Polydactylism is a dominant trait that results in extra fingers and toes in humans. A polydactyl man marries a woman with 10 fingers and toes. They have a child that has a normal number of digits. The phenotype of the man's father is unknown, but his mother has a normal phenotype. A. woman Dd, man dd B. woman DD, man dd C. woman dd, man DD D. woman dd, man Dd E. woman DD, man Dd or dd
The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as
A) active transport. B) facilitated transport. C) passive transport. D) osmosis. E) photolysis.
The saltwater aquarium strain of Caulerpa taxifolia
a. thrives on sandy or rocky shores and in mud. b. outcompetes endemic species. c. is now illegal to import into the United States. d. produces a toxin that poisons invertebrates and fish that might keep it in check. e. includes all of these descriptions.
Which of the following is NOT a function of bile salts?
A. aid the enzyme lipase in the digestion of fat molecules B. act as emulsifiers C. production of vitamin D D. needed for fat digestion