Ch.9 - RespirationWorksheetSee all chapters
All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Solution: Suppose you discovered a mutant yeast whose glycolytic pathway was shorter because of the presence of a new enzyme catalyzing the following reaction:Glyceraldehyde 3-phosphate + H2O + NAD+ → NADH + H+ + 3-phosphoglycerateWhich of the following changes would you expect to find in the growth and metabolism of the mutant yeast?A. The mutation will cause the yeast to grow faster under aerobic conditions.B. The formation of pyruvate from glucose will be energetically more favorable.C. The formation of pyruvate from glucose will be energetically less favorable.D. The mutation will cause the yeast to grow faster under anaerobic conditions.E. The mutant will not grow under anaerobic conditions.F. The mutant will not grow under aerobic conditions.

Problem

Suppose you discovered a mutant yeast whose glycolytic pathway was shorter because of the presence of a new enzyme catalyzing the following reaction:

Glyceraldehyde 3-phosphate + H2O + NAD+ → NADH + H+ + 3-phosphoglycerate

Which of the following changes would you expect to find in the growth and metabolism of the mutant yeast?

A. The mutation will cause the yeast to grow faster under aerobic conditions.

B. The formation of pyruvate from glucose will be energetically more favorable.

C. The formation of pyruvate from glucose will be energetically less favorable.

D. The mutation will cause the yeast to grow faster under anaerobic conditions.

E. The mutant will not grow under anaerobic conditions.

F. The mutant will not grow under aerobic conditions.

Solution

Yeast is a known eukaryote that is capable of doing fermentation as part of anaerobic respiration. This means, in the absence of oxygen, they would be able to replenish NAD+ so that the needed amount for glycolysis will be supplied as to let it proceed uninterrupted.

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