In a normal atom, the atomic number tells you how many electrons you have
1.True
2.False
1
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Which of the following is one of the four
defining characteristics of adaptive immunity?
a. specificity b. diversity c. memory d. self/nonself recognition e. all of these are defining characteristics of adaptive immunity
Which of the following consists of a hollow ball of cells?
a. gastrula b. morula c. blastula d. blastocoel e. zygote
The double helix model of DNA suggested by Watson and Crick was exciting to the scientific community because:
a. it opened the door to new PCR based technologies. b. it explained how genetic material could be duplicated by means of the complementary strands. c. it suggested the role of DNA in protein synthesis. d. it proved once and for all that DNA was the messenger of heritable traits. e. All of the above are correct.
________________ is a directional response to light.
Fill in the blank(s) with the appropriate word(s).