The type of organic molecule that can replicate is a
A. nucleic acid.
B. lipid.
C. protein.
D. carbohydrate.
Answer: A
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Lysozyme within saliva primarily functions to
A. wash materials off teeth. B. initiate the chemical breakdown of starch. C. inhibit bacterial growth. D. moisten and disperse food.
The plasma membrane is selectively permeable. This means
A. ATP is always needed to move molecules across the plasma membrane. B. only certain substances can pass through it. C. only gases and water can pass through it. D. substances need permission to pass through it. E. substances need carrier molecules to pass through it.
These cells can enter the tissues as macrophages and are important in chronic infections.
A. Monocytes B. Eosinophils C. Neutrophils D. Basophils
microRNA is ________.
A. partially complementary to many mRNAs B. complementary to a particular mRNA C. produced in large numbers by tumor cells D. single-stranded