Many protozoan species can form a _____ that can survive for periods outside a host.
Fill in the blank(s) with the appropriate word(s).
Cyst
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Which of the following is true of this person?
1.The person must be female because the mosaic pattern results from X inactivation.
2.The gene for the darker color is on the Y chromosome so one X chromosome is inactivated.
3.The darker color is expressed from the Barr body.
4.Dosage compensation ensures that there are equal numbers of light and dark skin cells.
The first living organisms appeared on Earth approximately
a. 4.6 billion years ago. b. 3.8 billion years ago. c. 1 billion years ago. d. 6400 years ago.
During the short recovery period before another
action potential, the a. threshold value is increased. b. threshold value is reduced. c. sodium gates are shut, and the potassium gates are opened. d. sodium-potassium pumps restore the ion gradients across the membrane. e. sodium gates are shut, potassium gates are opened, and the sodium-potassium pumps restore the ion gradients across the membrane.
A receptor potential is an all-or-none response
____________________ Indicate whether the statement is true or false.