Answer:
The correct option is D. The nerve and red blood cells will turn on and off different portions of their DNA, using different genes to make different proteins.
Explanation:
A zygote is totipotent which means it has the ability to differentiate into any cell type found in the body along with the placental cells.
The nerve and red blood cells are specialized cells and they cannot differentiate into any other cell type.
All cells in the body are formed from the zygote. All the cells in the body have the same chromosomes and the same genes. However, these cells become specialized because certain part of the DNA is activated in one type of cell which helps it perform its function. Different genes are activated in different specialized cells which are able to transcribe and translate.
Answer:
D is a spit. It is produced as a result of longshore drift conveying sediment through the beach and accumulating the sediments at a hurdle.
Explanation:
Spits are a product of deposition of sediment - which is a result of constant supply of longshore drift due to an alteration in the way or shape of a coastline. It is an extended stretch of beach substances which links to the mainland out of the sea at a certain end.
A typial form of a spit is Spurn Head, located in the north east of England at the north of the Humber Estuary. It is formed as a result of deposition of material from the erosion of the Holderness Coast in the north direction. Another example is Spurn Head in Yorkshire.
P.S. The attached image shows a Spit
Answer:
Fixation
Explanation:
The majority of nitrogen is fixed by bacteria which are symbiotic with plants which are converted to biologically useful forms by specialized bacteria. This occurs in two steps:
- bacteria convert ammonia in to (nitrites) NO₂,
- bacteria species convert it to NO₃ (nitrate).
Nitriates are a form of nitrogen that is usable by plants. It is assimilated into plant tissue as protein. The nitrogen is passed through the food chain by animals that consume the plants, and then released into the soil by decomposer bacteria when they die.
