Explain why mitochondria are often called "the powerhouse of the cell."
What will be an ideal response?
Mitochondria are often called the powerhouse of the cell because they provide energy to the cell in a form the cell can use. The process is similar to how coal burning or hydroelectric or nuclear power plants convert energy from one form into electricity that can be used to power your toaster.
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In Thomas Hunt Morgan's experiments, males had white eyes but females did not. What cross could you perform with his flies to obtain white-eyed females?
A. cross the F1 offspring to each other. B. cross an F1 female to a white-eyed male. C. cross an F2 female with an F1 male. D. cross an F2 female with a white-eyed male. E. crossing either the F1 or F2 females with a white-eyed male will produce some white-eyed females.
Which of the following is true about trabeculae in the spongy bone?
a. It contains the bone’s blood vessels and nerve fibers. b. It is responsible for lengthwise growth of long bones. c. It is arranged in rods or plates. d. It synthesizes and secretes matrix.
Closure of the Na+ channel inactivation gate is responsible for the ______ refractory period.
Fill in the blank(s) with the appropriate word(s).
At which spinal segment does the spinal cord end, giving rise to the cauda equina?
A. T11-T12 B. T12-L1 C. L1-L2 D. L2-L3 E. L3-L4