Cells produced by dividing B or T cells may be set aside for future responses to threat. These cells are
called
a. effector cells.
b. memory cells.
c. dendritic cells.
d. phagocytes.
e. fibroblasts.
B
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Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) 1
B) 2
C) 3
D) 4
A __________ is a virus that infects only bacteria. Fill in the blank(s) with the appropriate word(s)
Four of the five gases listed below were components
of the first primitive atmosphere simulation experiment. Select the exception. a. CH4 b. CO2 c. H2 d. H20 e. NH3
In a typical angiosperm, what is the sequence of structures encountered by the tip of a growing pollen tube on its way to the egg?
1. micropyle 2. style 3. ovary 4. stigma A) 4 ?? 2 ? 3 ? 1 B) 4 ? 3 ? 2 ? 1 C) 1 ? 3 ? 4 ? 2 D) 3 ? 2 ? 4 ? 1