Which of the following is a characteristics of the cell membrane?
Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly.
Which of the following is a component of the plasma membrane that creates a chemical barrier?
The phospholipid bilayer formed by these interactions makes a good barrier between the interior and exterior of the cell, because water and other polar or charged substances cannot easily cross the hydrophobic core of the membrane.
What is the difference between active and passive transport across the plasma membrane Mastering A&P?
What is the difference between active and passive transport across the plasma membrane? Active transport is used to move substances down their concentration gradient, whereas passive transport is used to move substances against their concentration gradient.
Which of the following correctly describes the plasma membrane?
Which of the following statements correctly describes the plasma membrane? It is a dynamic fuid structure that is in constant flux. Which of the following factors act to bind cells together? Specialized junctions, wavy membrane contours, and glycoproteins.
Which characteristic of the plasma membrane makes endocytosis possible?
There are different variations of endocytosis, but all share a common characteristic: the plasma membrane of the cell invaginates, forming a pocket around the target particle. The pocket pinches off, resulting in the particle being contained in a newly created intracellular vesicle formed from the plasma membrane.
Which of the following is the main component of the cell membrane?
Cell membranes are composed primarily of fatty-acid-based lipids and proteins. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol).
What characteristic do simple diffusion and facilitated diffusion share?
The common feature shared both by simple diffusion and facilitated diffusion is. both require energy for the transport of substances. both involve the movement of substances from regions of lower concentration to higher concentration without expenditure of energy.
Which of the following describes a lysosome?
A lysosome is a membrane-bound cell organelle that contains digestive enzymes. … They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.
Which of the following is a characteristic of the cell wall?
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.
Which of the following is a characteristic of the plasma membrane protein?
The correct answer is (A) It controls the contents of the cell. The plasma membrane forms a barrier around the cell to separate inside from outside….
What is a characteristic of a cell membrane quizlet?
Terms in this set (3)
Made up of phospholipids. arranged in two layers called a bilayer. Selectively permeable. it controls (selects) what can enter or leave the cell; some materials are allowed through and others aren’t. Fluid Mosaic Model.
Which are characteristics of mitochondria?
Mitochondria are typically round to oval in shape and range in size from 0.5 to 10 μm. In addition to producing energy, mitochondria store calcium for cell signaling activities, generate heat, and mediate cell growth and death.
Which of the following is a characteristic of active transport?
During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
What are the characteristics of cell wall Class 9?
The cell wall is the outermost covering of plant cells. It is present outside the cell membrane and is tough, flexible and sometimes rigid in its texture. It is mainly composed of cellulose, long fibres of carbohydrates including hemicellulose, lignin and pectin.
What are characteristics of bacteria?
There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size. Not all prokaryotes are bacteria, some are archaea, which although they share common physicals features to bacteria, are ancestrally different from bacteria.
What are the characteristics of a vacuole?
A vacuole is a membrane-bound cell organelle. In animal cells, vacuoles are generally small and help sequester waste products. In plant cells, vacuoles help maintain water balance. Sometimes a single vacuole can take up most of the interior space of the plant cell.
What are the characteristics of nucleus?
The nucleus contains nearly all of the cell’s DNA, surrounded by a network of fibrous intermediate filaments and enveloped in a double membrane called the “nuclear envelope”. The nuclear envelope separates the fluid inside the nucleus, called the nucleoplasm, from the rest of the cell.
What are the characteristics of cytoplasm?
Cytoplasm consists of all of the contents outside of the nucleus and enclosed within the cell membrane of a cell. It is clear in color and has a gel-like appearance. Cytoplasm is composed mainly of water but also contains enzymes, salts, organelles, and various organic molecules.
What are the characteristics of lysosomes?
Lysosomes vary in size and shape, but have several common features. They are surrounded by a single membrane, have an acidic interior pH level of about 5, and carry a high content of digestive enzymes.
What are the characteristics of peroxisome?
Peroxisomes are highly heterogeneous organelles that vary in size, shape, and protein composition depending on species, tissue, cell, metabolic state, or developmental stage. In general, peroxisomes are single membrane- bounded organelles with a finely granular electron-dense matrix.