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Vera_Pavlovna [14]
2 years ago
14

Which statement best describes the cell membrane?

Biology
1 answer:
vredina [299]2 years ago
5 0

Answer:C). A phospholipid bilayer with proteins

Explanation: A cell membrane is a phospholipid bilayer with proteins embedded in it. The fatty acyl chains of the phospholipids are non polar and hydrophobic while the phosphate groups are polar and hydrophilic. The hydrophobic regions of the phospholipids interact with each by facing each other, forming a bilayer with a fluid interior. The polar head groups face outward interacting with the external environment of the cell. Proteins are embedded in this bilayer and they float in this sea of phospholipids. Proteins anchored to the membrane through interactions between the hydrophobic regions of the phospholipids and the amino acid side chains of the proteins. These lipids and proteins swim laterally in each face of the bilayer but movement from one face of the bilayer to another is restricted.

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Gas exchange in the lungs of mammals occurs in the __________.
Ronch [10]
It takes place <span>between the alveoli and capillaries, which are located in the walls of the alveoli.</span>
5 0
3 years ago
5.
kipiarov [429]

Answer:

C. Vaccination

Explanation:

vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism.

5 0
3 years ago
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color. The al
Lerok [7]

Answer:

The parent's genotypes are:

Ddpp - tall, white parent

ddPp - dwarf, purple parent.

Explanation:

This question involves two different genes coding for height and flower color in pea plants. The alleles for tallness (D) and purple color (P) are dominant over the alleles for dwarfness (d) and white color (p) respectively.

According to this question, a tall plant with white flowers is crossed with a dwarf plant with purple flowers to produce the following proportion of offsprings: 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white.

Since some of the offsprings contain recessive alleles for both or either genes, the dominant traits of the parent is controlled by an heterozygous genotype. This means that the tall plant with white flowers has a genotype: Ddpp while the dwarf plant with purple flowers has the genotype: ddPp. In a cross between Ddpp × ddPp, 1/4 of each combination of alleles is produced in the offsprings (see punnet square in the attachment).

3 0
2 years ago
19. How many bones do sharks have in their bodies?
aivan3 [116]
None; sharks don't have bones, instead, they have strong cartilage, much like what our noses are made up of
5 0
2 years ago
First person to Answer gets a Brainliest!!
noname [10]

Answer:

A) Chlorophyll absorbs sunlight energy for photosynthesis. :)

Explanation:

To quote Nat Geo:

"Chlorophyll’s job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules" :)

6 0
2 years ago
Read 2 more answers
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