Answer:
Lung
Explanation:
The fish use gills to breathe and get oxygen from, while dolphins (being mammals) use lungs to do this same function.
There are 2 types of transport mechanisms that involve the movement of materials across the cellular membrane:
1. Passive Transport Mechanisms which is the movement of materials that does not require energy. Instead the movement relies on the permeability of the cell. Under this are three kinds of passive transport mechanisms:
a. Simple Diffusion:
- the movement of materials from a region of higher concentration to lower concentration. No external energy is necessary for the movement. The materials supply the energy themselves.
b. Facilitated Diffusion:
- This differs from simple diffusion because the movement is facilitated by proteins that make up the structure of the membrane. The proteins include channel proteins that allow ions and smaller molecules to cross the membrane. The other protein are the carrier proteins, which bind to materials like sugar molecules and move it across the membrane.
c. Osmosis:
- This is the diffusion of water across the membrane. Osmosis moves water from regions where there are more water molecules of water per volume to regions where there are less water molecules per volume.
2. Active transport on the other hand is a movement mechanism that requires energy. It uses the energy to send materials against the direction it is coming from through simple diffusion. This mechanism is used in a way to keep unwanted ions or other materials out of the cell.
Answer:
D
Explanation:
Remember in DNA A always pairs with T and G always with C so remember it as Apple Tree and Car Garage.
hope this helps:)
Answer:
target site direct repeats.
Explanation:
This type of cut and paste transposition is known as conservative transposition and non-replicative mode of transposition. This means that transposon is completely removed from its original sequence and moved to the other (target site) via enzymes tranposases.
The gaps formed by the action of transposases are being filled in by DNA polymerase. Upon excision, direct repeats are left in the chromosomal DNA.
