The portion of the membrane that faces the lumen is called the apical membrane.
Membrane is the lipid bilayer that surrounds the cell on its outer surface. The membrane serves various functions like: protection, cell shape and integrity and regulate the traffic of molecules across the membrane. It is semi-permeable in nature.
Lumen is the hollow portion present inside any organ or tube like the artery or intestine. It is a Latin word that means 'an opening'. The lumen of different organs served various purposes. However, the major function is the transport of substances like air, nutrients, waste materials, immune cells, hormones, etc.
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Remains of small animals, algae, and other organisms that lived in oceans and shallow inland seas hundreds of millions of years ago
i choose have a cell wall or nucleus and organelles hope this helps ✌
Answer:
A. The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.
Explanation:
The term crossing over refers to the process which occurs during meiosis in which genetic material is exchanged between two non-sister chromatids from two homologous chromosomes. The process of crossing over is responsible for bringing new genetic combinations and diversities in the offspring which is the main reason why offspring look different from parent and even siblings.
As we know that genes are located on specific positions in chromosomes and if the two genes are very close with each other, they will be inherited together because they are known as linked genes. Therefore, if two genes are very close to each other and also are present on same chromosome, no crossing over will occur between them and the both will be inherited together to the offspring. This type of transfer of two linked genes occurs as a unit.
Please see attached image for better understanding.
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Answer:
nucleus
Explanation:
DNA replication occurs in the nucleus cell.