2.4 Cell Membranes
in AP Biology
In fluid mosaic model, the membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids.
2.3 Cell and Organism Size
in AP Biology
The surface-to-volume ratio is an important parameter affecting cell size and shape.
NO DAY SHALL ERASE YOU FROM THE MEMORY OF TIME
作者： Benjamin
RIP for all the innocent people who lost their precious life in this terrible incident.
2.2 Subcellular Components of Eukaryotes
in AP Biology
Cells—the basic structural and functional units of every organism—are of two distinct types: prokaryotic and eukaryotic. Organisms of the domains Bacteria and Archaea consist of prokaryotic cells. Organisms of the domain Eukarya—protists, fungi, animals, and plants—all consist of eukaryotic cells.
2.1 Introduction to the Cell
in AP Biology
The cell is an organism’s basic unit of structure and function. Many forms of life exist as single-celled organisms. Larger, more complex organisms, including plants and animals, are multicellular. In this chapter, we focus mainly on eukaryotic cells—cells with a nucleus.
Thoughts Beyond Pages: A Summer of Reading Exploration
作者： Sophia
See the world with a 1.5x lens, view the human nature with a 0.5x lens. Explore the nature with a microscope, while you stand high when you ever tried to explore humanity.
布朗大学夏校感受
作者： Molly
When we really want to help a vulnerable group, what we need to do first is to understand and respect them, they are not the tool for you to showcase your great ability.
1.5 Nucleic Acids
in AP Biology
Nucleic acids are polymers made of monomers called nucleotides. Nucleic acids store, transmit, and help express hereditary information.
1.4 Protein
in AP Biology
Proteins are all constructed from the same set of 20 amino acids, linked in unbranched polymers. The bond between amino acids is called a peptide bond, so a polymer of amino acids is called a polypeptide. A protein is a biologically functional molecule made up of one or more polypeptides, each folded and coiled into a specific threedimensional structure.
1.3 Carbohydrates and Lipids
in AP Biology
Carbohydrates include sugars and polymers of sugars. The simplest carbohydrates are the monosaccharides, or simple sugars; these are the monomers from which more complex carbohydrates are built. Disaccharides are double sugars, consisting of two monosaccharides joined by a covalent bond. Carbohydrate macromolecules are polymers called polysaccharides,composed of many sugar building blocks. Lipids are the one class of large biological molecules that does not include true polymers, and they are generally not big enough to be considered macromolecules.