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Damm [24]
3 years ago
15

Materials essential to life processes move across a cell membrane through a variety of methods. What cell membrane structure all

ows water-soluble materials to be passively transported to the cytoplasm?
A. hydrophilic phospholipid tails
B. Golgi complex vesicles
C. carrier proteins
D. endocytosis vesicles
Biology
1 answer:
ElenaW [278]3 years ago
8 0

Answer:

C. carrier proteins

Explanation:

The core of the cell membrane is made up of hydrophobic tails of phospholipid. It does not allow the water-soluble material to move across the membrane. Carrier proteins are the membrane proteins that serve as transporters.

The carrier proteins bind the ion or water-soluble molecules and undergo changes in shape. This transports the molecule across the membrane. Carrier proteins serve in passive facilitated diffusion and active transport. The carrier proteins involved in facilitated diffusion transport the molecules down the concentration gradient without any expenditure of energy.  

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Ecosystems change when _______.
LUCKY_DIMON [66]
D. All of the above
8 0
3 years ago
Read 2 more answers
A male cardinal's red color is an example of a trait affected by natural selection. The females of the species choose mates
kompoz [17]

Answer:

In the cardinals, if the females start using a different criterion than the color of the feather when they choose couple, most likely to happen is that decreased variation in the shades of red because no form of the trait is advantageous.

Explanation:

Options for this question are:

  • <em>Increased variation in the shades of red because the selection pressure has been relieved.</em>
  • <em>Increased variation in the shades of red because the cardinals try different ways to impress the females.</em>
  • <em>Decreased variation in the shades of red because no form of the trait is advantageous.</em>
  • <em>Decreased variation in the shades of red because the only reason for variation was selection pressure.</em>

In the context of natural selection, male cardinals court females using the coloring of their feathers as a form of sexual selection. This means that the shades of red in the feathers are a selection criterion in these birds, and the more visible shades represent an advantage.

But, if the selection criterion was not the color of the feathers, this trait would no longer represent an advantage in the competition between the males to be chosen as a mate. Instead, the trait that would determine sexual selection would be the one that experiences an increase in its variation<em>.</em>

5 0
3 years ago
Why is Sodium stored in oil?​
Alex17521 [72]
Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
5 0
2 years ago
In garden pea plants, purple flowers (P) are dominant to white flowers (p), and full pod shape (F) is dominant to constricted po
kifflom [539]

Answer:

The phenotypes are as follows

Purple, full- 9

Purple, constricted- 3

White, full- 3

White, constricted- 1

Genotype of parents are PpFf, each produce the following gametes: PF, Pf, pF and pf.

Explanation:

This is a dihybrid cross involving two distinct genes. One coding for flower color and the other for pod shape. The allele for purple color (P) is dominant over the allele for white color (p) while the allele for full pod (F) is dominant over the allele for constricted pod (f).

In a cross between two heterozygote parents i.e. PpFf × PpFf, each parent will produce the following gametes: PF, Pf, pF and pf. Using these gametes in a punnet square (see attached image) the following 16 offsprings will be produced in a phenotypic ratio: 9:3:3:1

Purple color, full pod- 9

Purple color, constricted pod- 3

White flower, full pod- 3

White flower, constricted pod- 1

7 0
3 years ago
Which statement describes a BENEFIT of CORAL REEFS? A: they supply food to organisms in both rivers and ponds. B: they produce c
kirza4 [7]

Answer:

They are home to many species of fish and Marine invertebrates.

Explanation:

Coral reef refers to large underwater ecosystem which comprises of dead and living corals.

Coral reef is made up of calcium carbonate.

They serve as habitat or home for Marine animals.

They are the source of nitrogen and essential nutrients for Marine animals.

4 0
3 years ago
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