If a small droplet of ordinary fat is suspended in water, the fat molecules form a "ball of spaghetti" with no particular orientation. But if a droplet of phospholipid molecules is put in water, all the molecules point outward, toward the water. Phospholipids are forced into this orientation because phospholipids have _____

a charged end and a noncharged end
three fatty acid molecules, all pointing in different directions
two fatty acid molecules pointing in different directions
both a saturated fatty acid and an unsaturated fatty acid
two charged ends

Solution

The structure of phospholipids consists of the following groups and molecules –

a) A glycerol molecule

b) Fatty acids (2 in numbers) – It is hydrophobic as it is uncharged and non polar in nature

c) Phosphate group (with alcohol) – It is hydrophilic as it is negatively charged and polar in nature.

When the phospholipids are placed in water, the molecule rearranges itself in a way that the hydrophobic head face inside and the hydrophilic head face outside thereby forming micelles.

Hence, option 1 is correct

3 0

3 years ago

How does life exist at the bottom of the

Mekhanik [1.2K]

Answer:

C. Organisms are capable of producing food without light.

Explanation:

this is the best answer because mostly bacteria live in the the bottom of the ocean. and they feed on dead organisms who have already harnessed the sun's light to create food.

4 0

3 years ago

A scientist is comparing cancerous cells with noncancerous cells.

Simora [160]

The scientist should notice that the cancer cells have a higher rate of cell division and have a lower response to inhibiting factors. Cell groups that are cancerous should have a lower percent of cells in interphase than noncancerous cells.

Explanation:

The general characteristics of cancerous cells are defined by the ‘hallmarks of cancer’ like ‘enable replicative immortality, activate invasion and metastasis, resist cell death, evade growth suppressors’ etc. All these facts prove that they grow and divide at a higher rate and undergo uncontrollable mitotic cell division leading to proliferative invasion.

The cancerous cells also show low or no response to inhibiting factors like growth suppressors like p53, cyclins and other anti-tumor drugs.

The number of cancer cells in interphase is lower than noncancerous cells because interphase is a phase of cell growth, development and differentiation. Cancer cells undergo uncontrollable mitosis and more time is spent after the interphase to facilitate rapid cell division rather than growth or development.

7 0

3 years ago