Chapter 4
Brock Biology of Microorganisms · 8 exercises
Problem 1
Describe the central dogma of molecular biology. (Section 4.1)
4 step solution
Problem 2
Genes were discovered before their chemical nature was known. First, define a gene without mentioning its chemical nature. Then name the chemicals that compose a gene. (Section 4.1)
2 step solution
Problem 3
DNA molecules that are AT-rich separate into two strands more easily when the temperature rises than do DNA molecules that are GC-rich. Explain this based on the properties of AT and GC base pairing. (Section 4.2)
5 step solution
Problem 9
Why are errors in DNA replication so rare? What enzymatic activity, in addition to polymerization, is associated with DNA polymerase III and how does it reduce errors? (Section 4.6)
5 step solution
Problem 10
Do genes for tRNAs have promoters? Do they have start codons? Explain. (Sections \(4.7\) and 4.11)
6 step solution
Problem 11
The start and stop sites for mRNA synthesis (on the DNA) are different from the start and stop sites for protein synthesis (on the mRNA). Explain. (Sections \(4.7\) and 4.11)
3 step solution
Problem 13
Why do eukaryotic mRNAs have to be "processed" whereas most prokaryotic RNAs do not? (Section 4.9)
6 step solution
Problem 18
Define the types of protein structure: primary, secondary, tertiary, and quaternary. Which of these structures are altered by denaturation? (Section 4.14)
5 step solution