Answer:
The cell membrane is semi-permeable. It allows some molecules to enter easily inside the cell whereas some molecules are blocked from entering the cell.
Small, polar molecules and hydrophobic molecules enter easily through the cell membrane. But large molecules and ions cannot easily move inside the cell membrane.
A hydrophilic substance like the substance L mentioned in the question enters the cell membrane through the help of carrier proteins. The substance attached to the large protein might enter through active or passive diffusion but it can only enter the cell by attaching to carrier proteins.
Answer:
Answer b is the right one
Calico cats are predominantly female because they’re colouring is related to the X chromosome.
- Two X chromosomes are needed for a cat to have that distinctive tri-colour coat.
- If a cat has an XX pair, she will be female.
- Male cats have an XY chromosome pair, so they can’t be Calicos.
Have a great day <3 (I love cats)
