Viewing 1 - 10 of 129 results
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- Chapter Name:
- Chapter 1: Introduction to Cells
- Description:
- This frog egg cell has been fertilized and starts dividing. The first cell divisions occur very rapidly. Cells divide every thirty minutes. This timing is very precise. Egg cells that have been fertilized at the same time divide ...
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- Chapter Name:
- Chapter 1: Introduction to Cells
- Description:
- Keratocytes, found on the scales of fish, are specialized for very rapid motility in order to heal scratches.
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- Chapter Name:
- Chapter 1: Introduction to Cells
- Description:
- This single-celled amoeba crawls around by using actin polymerization to push out pseudopods, or false feet, to explore new territory. At the same time, organelles move in complex patterns within the cell.
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- Chapter Name:
- Chapter 1: Introduction to Cells
- Description:
- Some cells use rather peculiar ways to move, such as this eutreptiella flagellate, which uses both flagella and pronounced cell shape changes to swim.
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- Chapter Name:
- Chapter 2: Chemical Components of Cells
- Description:
- A glucose molecule is a six carbon sugar, consisting of a total of 24 atoms. It is very polar due to its hydroxyl groups to which water molecules can hydrogen bond. By convention, carbon atoms are shown in gray, oxygen in red and ...
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- Chapter Name:
- Chapter 2: Chemical Components of Cells
- Description:
- This molecule of palmitic acid contains a long tail of 16 carbons bonded to hydrogen atoms. It is this hydrocarbon tail that gives the molecule its overall hydrophobic character. In contrast, the oxygen-containing carboxyl group ...
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- Chapter Name:
- Chapter 2: Chemical Components of Cells
- Description:
- ATP molecules store and supply energy for cellular processes. An ATP molecule contains three building blocks: the flat purine ring system containing multiple nitrogen atoms shown in blue, the ribose sugar in the middle, and the ...
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- Chapter Name:
- Chapter 2: Chemical Components of Cells
- Description:
- Molecules in solution undergo random thermal movements and may encounter each other frequently if the concentration is sufficiently high. If two molecules with poorly matched surfaces collide, only a few weak bonds will form ...
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- Chapter Name:
- Chapter 3: Energy, Catalysis, and Biosynthesis
- Description:
- Envision a molecule, here symbolized by the ball, that, in principle, can react in four different ways. To undergo any of these reactions, the molecule must overcome an activation energy barrier that is of a characteristic height ...
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- Chapter Name:
- Chapter 3: Energy, Catalysis, and Biosynthesis
- Description:
- Driven by thermal energy, molecules are constantly in motion, which allows them to diffuse through cells in a random walk. Our simulation shows the degree to which a small sugar molecule on the left and a larger protein on the ...
Viewing 1 - 10 of 129 results
