Which of the following statements describes active transport?(1 point)
Net movement of a substance from a region of higher concentration to a region of lower concentration
Movement of a specific substance across a membrane.
[Movement of a substance against a concentration gradient. D]
Spontaneous movement of a substance through a semipermeable membrane
Movement of a substance against a concentration gradient.
The correct statement that describes active transport is the following: "Movement of a substance against a concentration gradient."
The correct statement that describes active transport is: "Movement of a substance against a concentration gradient."
To understand this concept, it's important to have a basic understanding of cell membranes. Cell membranes act as a barrier for substances, controlling what can enter or leave the cell. There are two types of transport mechanisms that help in moving substances across the cell membrane: passive transport and active transport.
Passive transport involves the movement of substances across the cell membrane without the expenditure of energy. One form of passive transport is diffusion, where substances move from an area of higher concentration to an area of lower concentration until an equilibrium is reached. This is described in the statement "Net movement of a substance from a region of higher concentration to a region of lower concentration."
On the other hand, active transport is a process that requires the cell to use energy, usually in the form of ATP (adenosine triphosphate), to move substances against their concentration gradient. This means that substances are transported from an area of lower concentration to an area of higher concentration. This statement, "Movement of a substance against a concentration gradient," accurately describes active transport.
In active transport, carrier proteins embedded in the cell membrane facilitate the movement of substances across the membrane against the concentration gradient. This process allows the cell to maintain specific concentrations of substances inside and outside of the cell, even when the natural tendency may be for the substances to diffuse in the opposite direction.
Which of the following describes how lysogenic virsuses are different from lytic viruses.(1 point)
Lysogenic viruses only infect plant cells and lytic viruses only infect animal cells.
Lysogenic viruses are made of DNA. Lytic viruses are made of RNA.
Lysogenic viruses are cellular and lytic viruses are not.
Lysogenic viruses do not cause the host cell to burst right away and lytic virsuses do immediately cause
the host cell to burst