What is the best description of the role of NADH in a cell? Select one: a. A waste product b. A carbohydrate, which stores energy in its many C-C bonds c. A protein that spins allowing hydrogen ions to pass through d. An electron carrier e. A molecule used to directly "power" most of a cell's work, for example active transport and myosin to make muscles to contract. What does the Krebs cycle accomplish? Select one: a. Breaks down larger carbon into smaller carbon molecules b. Generates ATP c. Reduces electron carriers (think of the specific ones you know) d. All of the above

What is the best description of the role of NADH in a cell? Select one: a. A waste product b. A carbohydrate, which stores energy in its many C-C bonds c. A protein that spins allowing hydrogen ions to pass through d. An electron carrier e. A molecule used to directly "power" most of a cell's work, for example active transport and myosin to make muscles to contract. What does the Krebs cycle accomplish? Select one: a. Breaks down larger carbon into smaller carbon molecules b. Generates ATP c. Reduces electron carriers (think of the specific ones you know) d. All of the above

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 11RQ: The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a....

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Cell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids; phospholipids b. phospholipids; protein d. phospholipids; ECM
Which plasma membrane component can be either found on its surface or embedded in the membrane structure? a. protein b. cholesterol c. carbohydrate d. phospholipid
In the plasma membrane, form(s) the lipid bilayer,determine(s) the fluid nature of the membrane, andmainly determine(s) the function of the membrane.a. phospholipids, cholesterol, proteinsb. phospholipids, proteins, cholesterolc. proteins, cholesterol, phospholipidsd. cholesterol, phospholipids, proteinse. cholesterol, proteins, phospholipids
Which of the following statements regarding the selective permeability of the lipid bilayer is FALSE? A. the permeability of the lipid bilayer to different substances varies. B. The lipid bilayer component of the plasma membrane is highly permeable to nonvolatile molecules such as oxygen. C. The more hydrophobic or lipid soluble a substance is, the greater the lipid bilayers permeability to that substance. D. The lipid bilayer component of the plasma membrane is moderately permeable to ions and large, uncharged polar molecules
Indicate whether the following statements are true or false. If a statement is false, explain why it is false. a. All types of cells contain cell walls, but only some cell types possess plasma membranes. b. The distribution of specific lipids to the inner and outer leaflet is asymmetrical, or biased, in plasma membranes. C. Lateral diffusion is the movement of lipids from one layer of the membrane to the other. d. Fatty acids tails are used to embed integral, transmembrane proteins in the plasma membrane.
Which statement about the plasma membrane is INCORRECT Select one : a It is composed of two layers of glycoprotein molecules . b. The plasma membranes of adjacent cells may be held together by desmosomes . . It contains receptors for specific molecules d . Gap junctions may be present between adjacent cells eltis selectively permeable
Match the following with the term that best describes them integral part of the plasma membrane can easily cross the semi-permeable plasma membrane cellular currency of cell that enables it to transport molecules against the concetration gradient (i.e active transport) act as channels carriers to transport polar molecules like sugars into cells A. phospholipids B. proteins C. ATP D. oxygen
The figure below illustrates a portion of a cell membrane. X denotes a membrane-spanning protein channel. Illustration of a partial cell membrane Which of the following is most likely true about the structure of X X A The upper and lower ends of X are hydrophilic and its middle is hydrophobic. C D The upper and lower ends of X, as well as its middle, are all hydrophobic. The upper and lower ends of X are hydrophobic and its middle is hydrophilic. The upper and lower ends of X, as well as its middle, are all hydrophilic.
Which of the following describes integral membraneproteins?a. They permit water movement only into or out of thecell.b. They transport only large proteins into the cell.c. They extend across the phospholipid bilayer.d. They are attached to the external plasma membranesurface
Choose which substances cannot pass through the phospholipid bilayer of the plasma membrane. A. Gasses B. Charged molecules C. Hydrophobic molecules D. Lions E. Water F. ATP
Which of the following is an incorrect description of components of the biological membrane? a. Hydrocarbon tail without carbon-carbon double bonds is saturated with respect to hydrogen. b. The movement of proteins in a bilayer can be monitored using FRAP С. Most of the lipids and some of the proteins cannot move sideways in the plane of the membrane and mostly a lipid may 'flip-flop' across the membrane from one phospholipid layer to the other O d. Cholesterol is a steroid which is wedged between phospholipid molecules of the plasma membranes of animal cells e. A kink in one of the hydrocarbon tails results from the presence of carbon-carbon double bonds and causes increased fluidity of the membrane
which of the following statements is correct about the movement of water across a plasma membrane a. it cannot pass through any ion channels b. it moves through the membrane via mediated transport c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer d. artificial lipid membranes are impermeable to water