Biology (Holt)
Analyzing the Effect of Electrical Charge on Ion Transport Background The electrical charge of an ion affects the diffusion of t ...
BIO graphic A molecule outside the cell binds to a carrier protein on the cell membrane. Carrier proteins transport substances d ...
Movement Against a Concentration Gradient Although facilitated diffusion can help move amino acids and sug- ars across the cell ...
A model of the sodium-potassium pump is shown in Figure 5. Step Three sodium ions inside the cell bind to the sodium- potassium ...
Movement in Vesicles Many substances, such as proteins and polysaccharides, are too large to be transported by carrier proteins. ...
Membrane Receptor Proteins We are constantly bombarded with information from other people and through television, the Internet, ...
Changes in PermeabilityThe receptor protein may be coupled with an ion channel, as shown in Figure 8. The binding of a signal mo ...
increase. Beta blockers, which are drugs prescribed to patients with a rapid heartbeat, bind to some of these receptor proteins. ...
CHAPTER 4 Highlights 87 Key Concepts Study CHAPTER HIGHLIGHTS ZONE Key Terms Section 1 passive transport (74) concentration grad ...
Using Key Terms 1.When the concentration of a substance is the same throughout a space, the substance is a.in equilibrium. b.a h ...
The model below shows the sodium-potassium pump. Use the model and your knowledge of science to answer questions 1–3. 1.What sub ...
Before You Begin Substances enter and leave a cell in several ways, including by .How efficiently a cell can exchange substances ...
2.Write a procedure for your experiment. Make a list of all the safety precautions you will take. Have your teacher approve your ...
Show jumperShow jumper Deer eating leavesDeer eating leaves ...
CHAPTER 5 Photosynthesis and Cellular Respiration 93 Looking Ahead Section 1 Energy and Living Things Energy in Living Systems A ...
Section 1 Energy and Living Things 94 CHAPTER 5Photosynthesis and Cellular Respiration Energy in Living Systems You get energy f ...
Breaking Down Food for Energy The chemical energy in organic compounds can be transferred to other organic compounds or to organ ...
ATP Recall that ATP (adenosine triphosphate) is a nucleotide with two extra energy-storing phosphate groups. As shown in Figure ...
Using the Energy in Sunlight When you eat a hamburger, you get energy from the sun indirectly. Plants, such as grass, capture th ...
Stage One: Absorption of Light Energy The chemical reactions that occur in the first and second stages of photosynthesis are som ...
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