Most microorganisms assimilate nitrogen as ________.
A. nitrite
B. nitrate
C. N2
D. hydrazine
Answer: B
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The skeleton of vertebrates serves several important functions. Among these are
_____ support and locomotion. _____ blood formation. _____ conduction of nerve signals. _____ protection of organs and soft tissues. _____ calcium homeostasis.
All of these terms refer in some way to sex
cells except
a. gametes. b. germ cells. c. haploid cells. d. zygotes. e. there is no exception; all of these terms refer to sex cells in some way.
Who first performed vaccinations by inoculating children with cowpox virus to provide immunity against smallpox?
A) Milkmaids B) Edward Jenner C) Lady Montague D) Louis Pasteur
Which of the following is NOT a characteristic of a morphogen?
A. morphogen gradients are always established in the oocyte B. morphogens can be distributed asymmetrically throughout a cell C. a morphogen will only elicit effects in areas where it is at a high enough concentration D. morphogens can be secreted to act on neighboring cells E. morphogens can cause cell death