PROBLEMS

Question 1.1

1.  E. coli and elephants. What is meant by the phrase “unity of biochemistry”? What are the implications of the unity of biochemistry?

Question 1.2

2.  Similar, but not the same. Describe the structural differences between DNA and RNA. ✓ 1

Question 1.3

3.  Polymers. Differentiate between proteins and glycogen in regard to their polymeric structure. ✓ 1

Question 1.4

4.  An authoritative belief. Define the central dogma of biology. ✓ 2

Question 1.5

5.  Information processing. Define replication, transcription, and translation in regard to the central dogma. ✓ 2

Question 1.6

6.  Hurry it up. What is an enzyme? ✓ 1

Question 1.7

7.  Complex and less so. Differentiate between eukaryotic cells and prokaryotic cells. ✓ 3

Question 1.8

8.  A diminutive organ? What is an organelle? ✓ 3

Question 1.9

9.  Double bounded. Which organelles are surrounded by two membranes?

Question 1.10

10.  Perforated. How does the nuclear membrane differ from other membranes?

Question 1.11

11.  An exit strategy. Trace the pathway of the formation of a secretory protein from its gene to its exocytosis from the cell.

Question 1.12

12.  Function and structure. Match the function with the appropriate organelle in the column at right.

Endoplasmic reticulum
Smooth endoplasmic reticulum
Rough endoplasmic reticulum
Golgi complex
Transport vesicles
Secretory granules
Endosome
Lysosome
Mitochondrion
Chloroplast
Nucleus
Plasma membrane
Separates the inside of the cell from the outside
Facilitate communication between the rough endoplasmic reticulum and the Golgi complex
Processes exogenous chemicals
Contains digestive enzymes
Site of photosynthesis
Membrane with ribosomes attached
Site of carbohydrate addition to proteins
Common form of cytoplasmic membrane
Destined for fusion with the plasma membrane
Site of fuel oxidation
Location of most of the cell’s DNA
Carries important biochemicals into the cell

Selected Readings for this chapter can be found online at www.whfreeman.com/tymoczko3e.

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