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jolli1 [7]
3 years ago
14

Which characteristics makes a cell membrane selectively preamble

Biology
2 answers:
Brrunno [24]3 years ago
8 0

Cells are selectively permeable due to the Phospolipid Bilayer. It allows only certain molecules to pass through. The cell membrane is made of two sheets of phosolipid bilayers

Ganezh [65]3 years ago
5 0

Did you mean permeable?

The hydrophobic center to a cell membrane (also known as a phospholipid bilayer) gives the membrane selective permeability.  If a substance is permeable , something such as water or gas can pass through it or soak.

Some solutes cross the membrane freely, some cross with assistance, and others do not cross at all.

Large molecules do not cross intact cell membranes, except in certain special cases.

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6 0
3 years ago
If a cell has 40 chromosomes, how many centromeres would it have when it is in metaphase? a. 1 b. 2 c. 20 d. 40 e. 80
Alla [95]

Answer:

Basically this depends on the type of cell division the cell undergoes.

if the cell undergoes reduction division of meiosis(n) the  chromosome number will be reduced to 20 so the centromere will be 20, However if the cell undergoes multiplication division of mitosis,(2n) the centromere will be 40, since the chromosomes number will increases and sister chromatids holding the chromosomes are held at centro mere.

Explanation:

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