Refer to Figure 37-4. Which of the fruits listed is botanically classified as a berry?
a. c
b. d
c. f
d. g
e. h
B
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The work of Bartel's group on the ribozyme RNA replicase supports which conclusion?
A) An RNA world could produce molecules that could self-replicate. B) Natural selection requires human oversight. C) DNA must have come before RNA. D) Life cannot come from nonlife.
Hematoma formation
What will be an ideal response?
Which statement is true of DNA's structure?
A. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. B. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine. C. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. D. When adenine base pairs with thymine, they are linked by three hydrogen bonds. E. All four bases in DNA can be found in equal quantities.
Which of the following is an important mineral ion of the cytochrome pigments used in cellular respiration?
A. potassium B. iron C. calcium D. magnesium E. zinc