Simple diffusion is the process by which a substance moves across a cell membrane from an area of high concentration to an area of low concentration. Substances that move by simple diffusion are able to diffuse directly across the phospholipid bilayer of the cell membrane. These substances are generally small and neutral, as large or charged particles cannot cross the phospholipid bilayer. Some examples of molecules that move by simple diffusion are carbon dioxide and oxygen.
Facilitated diffusion is the process by which a substance moves across a cell membrane from an area of high concentration to an area of low concentration with the aid of a membrane protein. Substances that move by facilitated diffusion are not able to diffuse directly across the phospholipid bilayer of the cell membrane. These substances are generally large and/or charged. They therefore travel through a protein channel in the cell membrane along their concentration gradient. Some examples of substances that can move by facilitated diffusion are glucose, sodium ions and chloride ions.
The similarities between facilitated diffusion and simple diffusion are:
They both involve the movement of a substance across a cell membrane along its concentration gradient (from an area of high concentration to an area of low concentration).
They are both examples of passive transport, as neither requires energy from the cell to move the substance across the membrane.
Answer:
probably spraying or dusting the plants
Explanation:
"Bedding is the separation of sediments into layers that differ from one another in texture, composition, color, or weathering characteristics".
Option (b);
<u>EXPLANATION: </u>
Sediments mean the matter that gets accumulated in one place. Sedimentary rocks are the results of the rock due to the accumulation of small particles that get weathered from rocks or erosion over time. They get accumulated either on the bottom of the sea level or earth's surface and thus the sediment rocks are formed.
These layers of sediments that are created based on difference in their shape, size, color and composition results it in bedding.The size of rocks in bedding ranges from several millimetres to centimetres and it sometimes results in a meter thick.
Answer:
Option D, Tdap today; Td in 4 weeks; Td 6 months after the second dose
Explanation:
In general, Tdap is given before Td to all those adults who have never been administered with Tdap earlier.
Also as per the publication of CDC, any individual who is of 7 years or older than this and has never been vaccinated by Td needs following schedule of medication
a) First primary dose
b) After the first primary dose the second primary dose of Td must be given in 4 weeks and
c) The third primary dose must be given after 6 to 12 months.
Hence, option D is correct
