In Huntington disease, a child will typically develop the disease if one parent also has it. It is as common in boys as in girls. This disease is
A. X-linked recessive.
B. autosomal dominant.
C. autosomal recessive.
D. X-linked dominant.
E. pleiotropic.
B. autosomal dominant.
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You are a skeptical scientist who is not convinced the phylogeny of animals is accurate. You wish to reconstruct the animal phylogeny using molecular sequence data. Which of the following genes would be the best choice?
A. genes involved in flagella development B. genes for mitochondrial cytochromes C. genes for collagen D. genes for jaw development
The route followed by a sperm from production to fertilization in a flowering plant is:
A. A pollen grain is produced in the anther, transported to a stigma where it produces two sperm cells that pass through a pollen tube that grows down the style to the ovary. One of the sperm cells enters the ovule and joins with the egg cell. B. A pollen grain is produced in the pistil, which explosively ejects it into the air where it is transported to a stigma where it forms two sperm cells. One of the sperm cells passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. C. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the filament, transported to a stigma where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. D. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the anther, transported to the pedicel where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. E. A sperm cell is produced in the anther, transported to a stigma where it becomes enclosed along with another sperm cell into a pollen grain that grows down the style to the ovary, enters the ovule and joins with the egg cell.
If you eliminated all sources of calcium (dairy products, some vegetables) from your diet, the level of ____ would rise
in an attempt to supply calcium stored in your body to the tissues that need it.
a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. GH
Seasonal abscission of fruits and leaves is mediated by ____
a. abscisic acid b. ethylene c. gibberellin d. auxin e. cytokinin