Ch.5 - Biological MoleculesWorksheetSee 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
Sections
Polymers
Carbohydrates
Proteins
Nucleic Acids
Lipids
Additional Practice
Cumulative Macromolecules

Solution: Which of the followingsequences can form beta-sheet (beta-strand) structure?A. (Ala-Ser-Ala-Gly-Asn-Glu)B. (Ala-Tyr-Ala-Thr-Ser-Val)C. (Ala-Pro-Gly-Pro-Lys)D. all of the aboveE. only A and B

Problem

Which of the followingsequences can form beta-sheet (beta-strand) structure?

A. (Ala-Ser-Ala-Gly-Asn-Glu)

B. (Ala-Tyr-Ala-Thr-Ser-Val)

C. (Ala-Pro-Gly-Pro-Lys)

D. all of the above

E. only A and B

Solution

A beta-sheet is formed when polypeptide chains line up side by side (each known as a beta-strand) with the strands interconnected by hydrogen bonds. These are present in many globular proteins. These protein structures can actually limit the amino acids that can be present in the sheet. For examlple, when these sheets are layered close together, the side chains should be relatively small.

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