6

Biology

1 answer:

Lelechka [254]3 years ago

6 0

Answer:

The cell membrane is selectively permeable, which controls the movement of materials in and out of the cell by passive and active transport.

Explanation:

According to this question, animal cells are made up of the following contents: 90% water and 10% protein, carbohydrates, nucleic acid, lipids and other molecules. The cell regulates this internal composition in a stable way via a process called HOMEOSTASIS.

The animal cell is able to regulate or maintain a stable internal composition by the possession of a selective permeable membrane called CELL MEMBRANE. The cell membrane is semi-permeable in the sense that it allows the entry of some molecules into and out of the cell and blocks others.

Some molecules are allowed by the cell membrane without the need for energy input in a transport called PASSIVE TRANSPORT while some requires energy input in a transport called ACTIVE TRANSPORT.

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Read 2 more answers

A scientist is studying fruit fly wings. Straight wings are dominant, and curly wings are recessive. Which statement correctly d

svetoff [14.1K]

The offspring will have one allele for straight wings and one allele for curly wings.

Explanation:

Let W be straight wings (big letter for dominant allele)
Let w be curly wings (small letter for recessive allele)

Each fly has two alleles.
If a parent is true breeding, it only has one type of allele.
Parent 1 = WW (straight wings)
Parent 2 = ww (curly wings)

Cross the parents: WW x ww in a Punnett square (see photo below)
This is the F1 generation (generation produced by crossing the first parents).
There are only Ww offspring.

Therefore,
The offspring will have one allele for straight wings and one allele for curly wings.

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3 years ago