Biology: The Science of Life by Stephen Nowicki PDF

By Stephen Nowicki

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Some DNA repair enzymes may actually introduce a change in an otherwise “correct” sequence of bases. Why might such a mechanism have evolved? 2. What are several reasons older people are more likely to develop cancer than younger people? ©2004 The Teaching Company Limited Partnership 55 56 ©2004 The Teaching Company Limited Partnership Timeline c. Formation of Earth from accretion of planetary material is completed c. Life clearly established on Earth, as evidenced by oldest confirmed fossil cells c.

The pentose sugar in RNA is called ribose and has a hydroxyl group in the second carbon position. The pentose in DNA lacks this hydroxyl group and is therefore deoxyribonucleic acid. 2. In RNA, the base uracil (U) replaces the thymine (T) base found in DNA. Uracil forms a complementary base pair with adenine (A) in RNA. 3. RNA usually occurs only in single-strand polymers, instead of DNA’s double helix. E. There are several different types of RNA. RNA that acts as an intermediate, or messenger, for information is called messenger RNA (mRNA).

These kinds of mutations are essentially neutral. B. Mutations that do change protein shape and function can render the protein dysfunctional. Such changes in protein structure and function can be lethal. C. Occasionally, a mutation may change the structure and function of a protein in a slightly advantageous way. VII. Unrepaired mutations in DNA, if they do not have a measurably deleterious effect, provide a source of genetic variation in a population. Genetic variation, in turn, provides the essential substrate on which natural selection and other evolutionary processes act.

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Biology: The Science of Life by Stephen Nowicki

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