In the figure above, which DNA fragment is the smallest?
a. A
b. B
c. C
d. D
e. E
E
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Which of the following characteristics separates primates from other mammals?
A. Primates are all placental animals, whereas other mammals are not. B. Primates all have opposable thumbs, whereas other mammals do not. C. Primates have nails instead of claws. D. Primates can regulate their body temperature. E. Primates are the only mammals that have eyes on the front of the face.
Which of the following immune system components has been identified in almost all multicellular
organisms? a. bone marrow b. phagocytes c. antimicrobial peptides d. T-cells e. memory cells
In the chemical sodium chloride, the positively charged sodium and negatively charged chlorine atoms are held together by a(n) _____ bond.
A. ionic
B. covalent
C. hydrogen
In roots auxins tend to ________ cell elongation, in stems they promote cell elongation.
A. have little effect on B. promote C. not be a factor in D. inhibit E. not influence