All categories

3 years ago

6. Cell membranes are primarily composed of a double layer of phospholipids. Why are phospholipids particularly

Biology

1 answer:

Andrews [41]3 years ago

8 0

Answer:

B i hope this help

Explanation:

The cell membrane consists primarily of a thin layer of phospholipids which spontaneously arrange so that the hydrophobic "tail" regions are shielded from the surrounding polar fluid, causing the more hydrophilic "head" regions to associate with the cytosolic and extracellular faces of the resulting bilayer. This forms a continuous, spherical lipid bilayer approximately 7 nm thick, barely discernible with a transmission electron microscope.

The arrangement of hydrophilic and hydrophobic heads of the lipid bilayer prevent polar solutes (e.g. amino acids, nucleic acids, carbohydrates, proteins, and ions) from diffusing across the membrane, but generally allows for the passive diffusion of hydrophobic molecules. This affords the cell the ability to control the movement of these substances via transmembrane protein complexes such as pores and gates.

You might be interested in

Help with question!!!!!!!!!!!!!

DanielleElmas [232]

Answer:

1) 4 chromosome (2pair)

2) 4 pairs

3) 1 pair each

8 0

3 years ago

Could you help me pls? 15 points!!!

yawa3891 [41]

Answer:

a. F. W. Went isolated the chemical substance responsible for

communicating stimulus information- TRUE

b. The chemical substance responsible for communicating stimulus

information is a hormone- TRUE

c.Charles and Francis Darwin confirmed that the tip of a plant stem is

responsible for initiating the phototropic response- TRUE

d.When the tip of a stem is covered with a transparent cap, the stem bends

toward the light source anyway- TRUE

e. When the base of a stem is covered with an opaque shield, the stem

bends away from the light source- FALSE

f. An example of another control mechanism is that some plants require

more than 12 hours of darkness to produce flowers- TRUE

7 0

3 years ago

Chemical process of breaking large molecules in food into smaller molecules

Goryan [66]

Answer:

digestion

Explanation:

breaking down of food particles into smaller substance is known as digestion.

7 0

3 years ago

Tau is a microtubule-associated protein that plays a key role in the development of certain brain disorders. To analyze Tau expr

telo118 [61]

Answer:

1. transcription of Tau DNA in different directions.

4. different chemical modifications of Tau protein.

Explanation:

Tau gene transcribe in different direction which depends upon the animal age. This happens because at different age and developmental stage, animal produce different RNA binding proteins which leads to formation of alternative splice forms. This reaction is strengthen by the addition of phosphate and sugar molecules which again depending on developmental stage and time.

8 0

3 years ago

"One of the two major systems that are affected by the stress response is the ____________, which results in increased productio

MAXImum [283]

Answer:

The correct answer is the endocrine system.

Explanation:

The sympathetic division of the autonomic nervous system and the endocrine system are the two prime systems that take part in the stress response.

At the time of acute or chronic stress, the endocrine system first makes the hypothalamus to discharge CRH or corticotropin-releasing hormone into the bloodstream. The release of CRH further makes the anterior pituitary to discharge ACTH or adrenocorticotropic hormone into the blood. This further stimulates the adrenal cortex to discharge cortisol, that is, one of the glucocorticoid hormone into the bloodstream.

The cortisol finally makes the organs and tissues present within the body to effectively cope up with the initial stress stimulus.

6 0

3 years ago