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4 years ago

How is the plasma membrane of a cell organized?

Biology

1 answer:

Ratling [72]4 years ago

7 0

Answer:

The correct answer is two layers of phospholipid with their polar hydrophilic heads facing away from each other.

Explanation:

The plasma membrane is composed of phospholipid bilayer in which the protein molecules are embedded .Each phospholipid of the phospholipid bilayer contain a glycerol head group that are arranged in the extracellular region away from each other.

whereas the fatty acid chain of the the phospholipid molecules of both the layer faces each other in the hydrophobic region of the plasma membrane.

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Use the drop-down menus to identify which bacterial shape applies. a (rod-shaped) b (spiral-shaped) c (spherical)

photoshop1234 [79]

The identity of the bacterial shape is the following:

a (rod-shaped)- bacillus.

b (spiral-shaped)- spirillum.

c (spherical)- coccus.

<h3>What are bacteria?</h3>

Bacteria are single-celled microorganisms found as free-living or parasites.

They are found in many shapes and sizes.

There are good bacteria that help humans and other animals, and bad bacteria are harmful to the animals.

Thus, the shape of the bacteria area (rod-shaped)- bacillus., b (spiral-shaped)- spirillum., c (spherical)- coccus.

Learn more about bacteria

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5 0

2 years ago

The diagram shows the growth of a plant over several months.

sweet [91]

Answer:

The correct answer is : Hormones in the plant help fruits develop and ripen.

Explanation:

Development of fruits and its ripening is brought about by a number of plant hormones :

Auxin - It promotes the cellular growth, both with respect to cell-division and cell elongation. It promotes the cells in the fruit to expand isodiametrically.
Gibberellic Acid - This hormone delays the ripening of fruits and also prevents senescence. It helps the fruits to acquire enhanced characteristics.
Cytokinin - Promotes cell division during the development of fruit.
Ehylene - Promotes the ripening of fruits.

6 0

3 years ago

Read 2 more answers

How does your body exchange carbon dioxide for oxygen?

Gekata [30.6K]

This exchange process takes place in the aveolus (air sac) inside your lungs by diffusion.
it's from a different concentration gradient
the deoxygenated blood with carbon dioxide diffuse into a aveoli (which is in high concentration) and the aveoli release the oxygen into the blood stream (which is low concentration) therefore the blood will be oxygenated again

4 0

3 years ago

Urgent Help!

Arte-miy333 [17]

Assuming diallelic genes, that express complete dominance, and assort independently, 1) Genotypic ratio=1:2:1. Phenotypic ratio=3:1 / 2) Parental genotype: PpRr. Gametes= PR, Pr, pR, pr. Phenotypic ratio: 9:3:3:1

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We will assume diallelic genes that express complete dominance. In cases where two or more genes are involved, we will assume they are not linked, and alleles assort independently.

1) FRECKLES

F is the dominant allele that codes for freckles

f is the recessive allele that codes for no-freckles

Cross: Between a mother and a father who both have freckles and are heter0zyg0us for the trait

Parentals) Ff x Ff

Gametes) F f F f

Punnett square) F f

F FF Ff

f Ff ff

F1) Genotype

1/4 = 25% of the progeny is expected to be h0m0zyg0us dominant, FF

2/4 = 1/2 = 50% of the progeny is expected to be heter0zyg0us, Ff

1/4 = 25% of the progeny is expected to be h0m0zyg0us recessive, ff

Phenotype

3/4 = 75% of the progeny is expected to express freckles, FF + Ff

1/4 = 25% of the progeny is expected to not express freckles, ff

Genotypic ratio ⇒ 1:2:1

Phenotypic ratio ⇒ 3:1

2) FLOWER COLOR AND SEED SHAPE

P is the dominant allele that codes for purple flowers

p is the recessive allele that codes for white flowers

R is the dominant allele that codes for round seeds

r is the recessive allele that codes for wrinkled seeds

Cross: Between two plants that are heter0zyg0us for flower color and seed shape

Parentals) PpRr x PpRr

Gametes) PR, Pr, pR, pr PR, Pr, pR, pr

Punnett square) PR Pr pR pr

PR PPRR PPRr PpRR PpRr

Pr PPRr PPrr PpRr Pprr

pR PpRR PpRr ppRR ppRr

pr PpRr Pprr ppRr pprr

F1) Genotype

1/16 individuals are expected to be PPRR

2/16 individuals are expected to be PPRr

1/16 individuals are expected to be PPrr

2/16 individuals are expected to be PpRR

4/16 individuals are expected to be PpRr

2/16 individuals are expected to be Pprr

1/16 individuals are expected to be ppRR

2/16 individuals are expected to be ppRr

1/16 individuals are expected to be pprr

Phenotype

9/16 individuals are expected to have purple flowers with round seeds, PPRR + PpRR + PPRr + PpRr

3/16 individuals are expected to have purple flowers and wrinckled seeds, PPrr + Pprr

3/16 individuals are expected to have white flowers and round seeds, ppRR + ppRr

1/16 individuals are expeceted to have white flowers and wrinckled seeds, pprr.

Phenotypic ratio ⇒ 9:3:3:1

Genotype of parent plant 1: PpRr

Gamete 1: PR
Gamete 2: Pr
Gamete 3: pR
Gamete 4: pr

Genotype of parent plant 2: PpRr

Gamete 1: PR
Gamete 2: Pr
Gamete 3: pR
Gamete 4: pr

 PHENOTYPE GENOTYPE 

purple flowers, round seeds: PPRR, PpRR, PPRr, PpRr

purple flowers, wrinkled seeds: PPrr, Pprr

white flowers, round seeds: ppRR, ppRr

white flowers, wrinkled seeds: pprr

 PHENOTYPE NUMBER 

purple flowers, round seeds: 9

purple flowers, wrinkled seeds: 3

white flowers, round seeds: 3

white flowers, wrinkled seeds: 1

------------------------------------

You can learn more about monohybrid and dihybrid crosses at

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4 0

3 years ago

The bat-eared fox has 30 chromosomes in its body cells. when the fox's body cells divide by mitosis, how many chromosomes will e

zaharov [31]

Chromosome is apart of a cell that contains genetic material inform of genes, it contains DNA molecules packaged around histone proteins. Mitosis is a type of cell division that take place in the somatic cells where a cell divides into two daughter cells with the same number of chromosomes as the parent cell (diploid). Therefore, in this case each daughter cells will have 30 chromosomes.

5 0

3 years ago

Read 2 more answers