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1. quizlet.com › 241551441 › biology-exam-4-flash-cardsBiology Exam 4 Flashcards - Quizlet

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   Explore the wonders of biology. Access easy-to-understand explanations and practical examples on key biology topics, from cells to ecosystems. Learn at your own pace with bite-sized, verified content. Learn biology

2. quizlet.com › test › exam-4-molecular-biology-971496410Test: Exam 4 Molecular Biology - Quizlet

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   o These heterodimers are more likely to form in the nucleus rather than forming in the cytosol and being trafficked into the nucleus

3. quizlet.com › 282340045 › biology-exam-4-flash-cardsBiology Exam 4 Flashcards - Quizlet

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   Study with Quizlet and memorize flashcards containing terms like 3', homologous, heterozygous and more.

4. chem.libretexts.org › Courses › Smith_College26.11: Protein Structure - Chemistry LibreTexts

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   Jan 15, 2023 · Figure 26.9.1 Ball-and-stick model of the α helix. Hydrogen bonds are shown as dotted bonds. Note that R groups extend almost perpendicular from the axis. An α-helix is a right-handed coil of amino-acid residues on a polypeptide chain, typically ranging between 4 and 40 residues.

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5. www.studocu.com › en-us › documentBio 311 Exam 4 Review - 2018 exam 4 - BIO 311 EXAM 4 REVIEW ...

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   Humans have six actin genes which encode isoforms of actin Alpha actin is associated with contractile structures Beta actin is at the front or leading edge of moving cells Gamma actin accounts for filaments in stress fibers F-actin consists of units of G-actin arranged in a tight helix with each binding either an ATP or ADP molecules Filamentous actin Key structural element in micro vill One ...

6. www.tests.com › practice › biology-examFree Biology Practice Test from Tests.com (2025 updated)

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   Try this free biology practice test to see how prepared you are for a biology exam. Whether you are in high school or college, you are likely to have a biology requirement. Biology tests cover such subjects as the chemistry of life, evolution, genetics and ecology. For a more comprehensive study of biology, try our 400 question Biology Practice ...

7. People also ask

   What is a helix?

   • Note that R groups extend almost perpendicular from the axis. An α-helix is a right-handed coil of amino-acid residues on a polypeptide chain, typically ranging between 4 and 40 residues. This coil is held together by hydrogen bonds between the oxygen of C=O on top coil and the hydrogen of N-H on the bottom coil.

   26.11: Protein Structure - Chemistry LibreTexts

   chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/26:_Biomolecules-_Amino_Acids_Peptides_and_Proteins/26.11:_Protein_Structure

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   How is a helix held together?

   • This coil is held together by hydrogen bonds between the oxygen of C=O on top coil and the hydrogen of N-H on the bottom coil. Such a hydrogen bond is formed exactly every 4 amino acid residues, and every complete turn of the helix is only 3.6 amino acid residues.

   26.11: Protein Structure - Chemistry LibreTexts

   chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/26:_Biomolecules-_Amino_Acids_Peptides_and_Proteins/26.11:_Protein_Structure

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   Is DNA a double helix?

   • The two strands of the helix run in opposite directions. This antiparallel orientation is important to DNA replication and in many nucleic acid interactions. Figure 3.12.1 3.12. 1: DNA is a Double Helix: Native DNA is an antiparallel double helix.

   3.12: Nucleic Acids - The DNA Double Helix - Biology LibreTexts

   bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_(Boundless)/03:_Biological_Macromolecules/3.12:_Nucleic_Acids_-__The_DNA_Double_Helix

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   How many amino acids are in a helix?

   • Such a hydrogen bond is formed exactly every 4 amino acid residues, and every complete turn of the helix is only 3.6 amino acid residues. This regular pattern gives the α-helix very definite features with regards to the thickness of the coil and the length of each complete turn along the helix axis.

   26.11: Protein Structure - Chemistry LibreTexts

   chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/26:_Biomolecules-_Amino_Acids_Peptides_and_Proteins/26.11:_Protein_Structure

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   What is the difference between a helix and a beta strand?

   • In a helix, the main chain of the protein adopts the shape of a clockwise spiral staircase, and the side chains point out laterally. In a beta-sheet (or beta-strand) structure, two sections of protein chain are aligned side-by-side in an extended conformation.

   26.11: Protein Structure - Chemistry LibreTexts

   chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/26:_Biomolecules-_Amino_Acids_Peptides_and_Proteins/26.11:_Protein_Structure

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   Where are the bulky R groups located in a protein helix?

   • In an α helix, such as the one shown in Figure 26.9.1, the bulky R groups are all found on the outside of the helix, where they have the most room. Protein structure can be discussed at four distinct levels. A protein’s primary structure is two-dimensional - simply the sequence of amino acids in the peptide chain.

   26.11: Protein Structure - Chemistry LibreTexts

   chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/26:_Biomolecules-_Amino_Acids_Peptides_and_Proteins/26.11:_Protein_Structure

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8. bio.libretexts.org › Bookshelves › Introductory_and3.12: Nucleic Acids - The DNA Double Helix - Biology LibreTexts

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   Nov 23, 2024 · DNA has a double-helix structure, with sugar and phosphate on the outside of the helix, forming the sugar-phosphate backbone of the DNA. The nitrogenous bases are stacked in the interior in pairs, like the steps of a staircase; the pairs are bound to each other by hydrogen bonds. The two strands of the helix run in opposite directions.