题目内容

Which of the following occurs during complementary base pairing? ()

A. bonds form between uracil and thymine
B. bonds form between cytosine and guanine
C. bonds break between phosphates and sugars
D. bonds break between amino acids and phosphates

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All cells have all of the following except ()

A. plasma membrane
B. genetic material
C. cytoplasm
D. cell wall

Ribosomal RNAs are manufactured in which specific area of a eukaryotic cell? ()

A. The nucleus
B. The cytoplasm
C. The nucleolus
D. The chromatin

The current theory of the structure of the plasma membrane is best described by the _______model. ()

A. sandwich
B. fluid-mosaic
C. unit membrane
D. electrochemical

In a phospholipid bilayer, the ()

A. phosphate groups are hydrophobic.
B. proteins are located only between the two layers.
C. fatty acid tails are hydrophilic.
D. phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm.

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