Concentration gradient - Study guides, Class notes & Summaries

transport proteins - are responsible for controlling passage across the membrane fluid mosaic model - The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids fatty acid tails - nonpolar, hydrophobic fatty acid heads - hydrophilic, polar periphial proteins - bound to the surface of the membrane integral proteins - penetrate the hydrophobic core (ones that span the membrane are transmembrane protiens How do cells recognize each other? - by binding to molec...

Testbank for Biology 2nd Edition from OpenStax CollegeChapter 1 1 Figure 1.6 1: C; 2: F; 3: A; 4: B; 5: D; 6: E. The original hypothesis is incorrect, as the coffeemaker works when plugged into the outlet. Alternative hypotheses include that the toaster might be broken or that the toaster wasn't turned on. 3 Figure 1.16 Communities exist within populations which exist within ecosystems. 4 B 6 D 8 C 10 C 12 B 14 D 16 Answers will vary, but should apply the steps of the scientific method. One poss...

Membrane remodeling Requires phospholipases Requires acyl transferases Occurs only when cells are under stress Correct! Both A and B are correct All of the above are correct Both A and B are correct In simple diffusion a solute Is propelled by random molecular motion Moves up its concentration gradient Moves across a membrane because of an input of free energy. Both A and B are correct All of the above are correct Is propelled by random molecular motion

Does water need a pore/channel to cross the capillary wall? ANS: - No, movement is passive during what do the sympathetic and parasympathetic nervous systems work together ANS: - male sexual function parasympathetic nervous system: erection sympathetic nervous system: ejaculation electrical chemical gradient ANS: - when K+ leaks out of cell, leaves behind - charged anion cell inside is more negative creates electrical gradient to pull K+ back inside cell example of measuring an unknown v...

A cell is taken out of the body and placed into a test solution. The concentration of solute X in the test solution is 100mM, and the concentration of solute X inside the cell is 200mM. The cell membrane is permeable to water but not solute X. Which of the following statements is/are true? a. There is a net flux of water out of the cell b. The test solution is hypertonic c. There is flux of water molecules into and out of the cell d. All of the above are true - c. There is flux of water mo...

Osmosis is the movement of Answer water through a selectively permeable membrane down its concentration gradient The ability of an organism to sense and react to changes in its body illustrates Answer responsiveness In negative feedback mechanisms, changes away from the normal state Answer stimulate changes in the opposite direction to restore normal levels Which of the following are living organisms simplest unit? Answer cells An organic compound always contains Answer carbon and hy...

Afferent - Signal to the brain, input Efferent - motor, output sensory receptors - receptors of the nervous system Control center of CNS - Brain Effectors of nervous system - muscles and glands transduction - How sensory information is received What is the CNS composed of? - brain and spinal cord What is the PNS composed of? - cranial nerves III-XII, Spinal nerves, ganglia, enteric plexuses, sensory receptors ganglion - collection of nerve cell bodies in the peripheral ne...

why are membranes called phospholipid bilayers? - Answer-phospholipids have hydrophilic head and hydrophobic tail, hydrophobic face inside of cell making 2 layers what is meant by fluid mosaic? - Answer-Mosaic of proteins drifting laterally in fluid bilayer of phospholipids how are membranes adjusted for different temperatures? - Answer-membrane fluidity adjusted by changing the ratio of unsaturated to saturated fatty acids how do the relative amounts of saturated and unsaturated fats chan...

Rush Advanced Pharmacology NSG 531 Exam 1 Questions and Correct Answers Drug - Answer-a substance intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease and a substance, other than food, intended to affect the structure or any function of the body T/F most drugs are strong acids or strong bases - Answer-F - most drugs are weak acids or weak bases what are the four things that the body does to a drug? - Answer-1. absorbs it 2. distributes it (think about...

Bio 103 exam 2 McMullen Questions and Answers Rated A+ **What fundamental principles does cell theory encompass?** Cell theory asserts that ** all living organisms are made up of cells, which serve as the fundamental units of structure and function, and that cells arise from pre-existing cells**. **Describe the characteristics of a eukaryotic cell.** A eukaryotic cell is ** defined by the presence of a nucleus and various membrane- bound organelles**. Eukaryotes can exist as ** u...

Mark Scheme (Results) Summer 2023 Pearson Edexcel GCE In Biology B (9BI0) Paper 01: Advanced Biochemistry, Microbiology, and Genetics Edexcel and BTEC Qualifications Edexcel and BTEC qualifications are awarded by Pearson, the UK’s largest awarding body. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. For further information visit our qualifications websites at or . Alternatively, you can get in touch with ...