The most common form of ionizing radiation is ____________________. Fill in the blank(s) with the appropriate word(s)
ANSWER: radon
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Attribute one of these statements to the blastopore.
A. it occurs in both protostomes and deuterostomes. B. it is the opening from the coelom to the outside of the animal. C. it is the opening from the archenteron to the coelom. D. it can develop into the brain in some animals. E. it can develop into the gut in some animals.
The human temperature set point typically ____
a. ranges from about 96.0?F to about 99.9?F b. stays right at about 98.6?F c. stays right at about 96.8?F d. ranges from about 98.0?F to about 99.5?F e. ranges from about 94.0?F to about 99.0?F
Refer to the accompanying figure. At what point of this life cycle does fertilization occur?
a. 1
b. 4
c. 6
d. 7
e. 8
Virulent and temperate phages differ in that ________.
A. virulent phages always result in the lysis of the host cell, whereas temperate phages may lyse the host cell, or they can enter a lysogenic cycle whereby they integrate their genome into the genome of the host cell B. temperate phages integrate their genome into that of the host cell, causing uncontrolled growth and ultimately lysis of the cell, whereas virulent phages remain in the lysogenic phase indefinitely C. temperate phages always result in the lysis of the host cell, whereas virulent phages may lyse the host cell, or they can enter a lysogenic cycle whereby they integrate their genome into the genome of the host cell D. virulent phages cause mutations in the host cell genome, whereas temperate phages have no genetic effect on the host cell