A bilayer with a short and unsaturated hydrocarbon tail has what permeability and what fluidity? - ️️High fluidity and high permeability
A general function of all cellular membranes is to - ️️Regulate which materials can enter or leave the cell.
A molecule that binds to the particular thr...
Zapanta Biology 0150 | 315 Questions Correctly Answered|2024 A bilayer with a short and unsaturated hydrocarbon tail has what permeability and what fluidity? - ✔ ✔ High fluidity and high permeability A general function of all cellular membranes is to - ✔ ✔ Regulate which materials can enter or leave the cell. A mol ecule that binds to the particular three -dimensional structure of a receptor site is known as a - ✔ ✔ Ligand. A prokaryotic cell lacks a _____ and a _____ . - ✔ ✔ nucleus; membrane -bound organelles. A protein kinase Cascade can amplify an intracellular sig nal by - ✔ ✔ Activating one kinase molecule that can then trigger the activation of many proteins. A protein that forms an ion channel in a membrane is most likely to be - ✔ ✔ A transmembrane protein. According to endosymbiotic theory, which subcellular st ructures were once independent prokaryotic organisms? - ✔ ✔ Mitochondria and chloroplasts. Actin interacts with the motor protein _____ to cause cellular movement. - ✔ ✔ Myosin Activated G proteins interact with other enzymes, starting a _____ ______ _____ _. - ✔ ✔ Signal transduction pathway Active transport moves molecules - ✔ ✔ In a direction opposite to the one in which diffusion moves them. ADH does what in the collecting duct? - ✔ ✔ Increases the permeability of the collecting duct to water by insertio n of aquaporins Adjacent plant cells are connected by cell membrane -lined channels called what? - ✔ ✔ Plasmodesmata After a stimulus results in initial depolarization of a region of cell membrane of a neuron, a threshold voltage is reached. Once this happe ns, which of the following takes place? - ✔ ✔ A large number of voltage -gated sodium channels quickly open, causing a rapid change in a membrane potential. An unknown organism can be identified as a fungus if it - ✔ ✔ Has cell walls made of chitin and obta ins it's food by absorptive heterotrophy. Antiporter - ✔ ✔ Transports two different substances in opposite directions As the protein is synthesized, a ______ ____ ____ in the cytoplasm binds to the signal sequence and brings the protein and ribosome to the ER membrane. - ✔ ✔ signal recognition particle As water enters a cell, turgor pressure increases because - ✔ ✔ The cell wall resists swelling. At the peak of the action potential, voltage -gated sodium channels ____ and voltage -gated potassium channels ___ _. - ✔ ✔ Close; open. Bacteria and archaea show extensive morphological diversity in _____, _____, and ______. - ✔ ✔ Size, shape, and motility Can water be transported activly in the nephron? - ✔ ✔ No, only osmosis Carrier proteins can only move molecules down their ______ ______? - ✔ ✔ Concentration gradient Carrier proteins or transporters change shape during what process? - ✔ ✔ Transport processes. Cell adhesion in animals often occurs through the interactions of - ✔ ✔ Carbohydrates. Cell adhesion is usu ally homotypic? - ✔ ✔ same molecules sticks out from both cells and bind to each other. Cell membranes contain almost as much of what as they do phospholipids? - ✔ ✔ Protein Cells can move within a tissue by doing what? - ✔ ✔ Binding and reattaching of int egrin to the ECM? Cells require precise concentrations of solutes to function. This is called the? - ✔ ✔ Osmolarity Cells use different mechanism to respond to external signs. These mechanisms include: - ✔ ✔ Opening or closing or ion channels, using transc ription factors that respond by turning gonna or off the expression of genes, and altering the rate of chemical reactions in the cell. Certain bacteria and archaea are the only organisms capable of converting molecular nitrogen to ammonia. What is this cal led? - ✔ ✔ Nitrogen fixation Chemical signals that target cells can be classified by what? - ✔ ✔ Signal source and mode of delivery Chloroplasts are a type of - ✔ ✔ Plastid. Choose the correct path by which filtrate moves, beginning with where it enters a nephron . - ✔ ✔ Bowman's capsule Proximity convoluted tubule Loop of Henle Distal convoluted tubule Collecting duct Connexions are channel structures that make up ____. - ✔ ✔ Gap junctions. Cortisol - ✔ ✔ Rises in response to stress. Desmosomes do what? - ✔ ✔ Hold neighboring cells together through proteins attached to intermediate filaments. Diffusion occurs up or down a concentration gradient? - ✔ ✔ Down During transpiration, the stomata ______, air surrounding the leaves is ______ than the air inside the leaves. - ✔ ✔ open, drier Each protein that comes out of the folfi apparatus has a______ ______ that places it in a particular type of ______ ______? - ✔ ✔ molecular tag, transport vesicle ECM is composed of fibrous proteins such as...? - ✔ ✔ collagen, gel -like p roteoglycans, and other proteins Enzymes that use ATP to phosphorylate proteins are called - ✔ ✔ Protein kinase. Eukarotic organelles are _____ _____? - ✔ ✔ membrane enclosed Eukaroytes, unlike Prokaotes, don't have a nucleortide. What do they have instead ? - ✔ ✔ nucleus Eukaryotes are diverse, but they share common features. These are? - ✔ ✔ Larger, have more organelles and a cytoskeleton, Hqave a nuclear envelope, multicellular (most), asexual or sexual reproduction Eukaryotes include - ✔ ✔ Plants, animal s, fungi, and protists. Events in the interaction of a cell with a signal in order. - ✔ ✔ Signal release from source Sign binding to receptor Sign transduction Alteration of cell function Explain amine hormones. - ✔ ✔ Amino acid derivative hormones Explain Amoeboid motion - ✔ ✔ Sliding motion some protists do by streaming of pseudopodia Explain autophagy - ✔ ✔ the process by which damaged organelles are surrounded by a membrane and delivered to a lysosome to be recycled
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