A frog
a. drinks pond water.
b. actively transports ions inward across its skin.
c. loses water to its pond.
d. makes a large volume of dilute urine.
e. does all of these.
Answer: b
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A waxy cuticle helps prevents desiccation. What is the cost of this adaptation?
A. Increased exposure to damaging UV radiation B. Lowered light absorption C. Reduced gas permeability D. Increased susceptibility to pathogenic infection E. Slower H2O transport
The specimen of choice to collect in suspected cases of respiratory syncytial virus (RSV) is:
a. buccal mucosa. b. sputum. c. throat. d. nasopharyngeal.
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.
The X chromosome in humans _____.
A) is much larger than the Y chromosome B) carries the SRY gene, the master gene for male sex determination C) carries approximately 255 genes D) is the largest autosome