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pochemuha
3 years ago
11

Do all cells of the body express the same genes?

Biology
2 answers:
inn [45]3 years ago
7 0

All the cells in a person's body have the same DNA and the same genes. However, the difference between cells in different tissues and organs is that the "expression" of the genes differs between cells.

~Matya

aleksklad [387]3 years ago
3 0

All cells in the body have the same DNA and the same genes. In organs & tissues the expression changes.

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What type of membrane proteins are integral proteins that move ions or molecules across plasma membrane?
blsea [12.9K]

Answer:

Channel proteins and Carrier proteins

Explanation:

These are type of membrane proteins that transcend the entire length of  phosphoslipid  bi- layer  in the plasma membrane.They facilitate the movement of ions  and molecules across  the walls of the plasma membranes.

Generally, substances like glucose, amino acids, are too large to pass through the phopholipid bilayers. Likewise ions of  potassium, sodium calcium, because of their polarities can not pass through either. They are ferried across the phospholipid by  group of protein structures called channel proteins. Some are also transported across by carrier  proteins.  The process by which these protein structures  aided the  diffusion of substances across the phospholipid bilayer is called Facilitated diffusion.

Channel proteins are pores, that are filled with water molecules with the entrance  well gated.  That is the entrance  is controlled by part in the inner structure  of the protein  which can open or close the pores  like a gate to control the movement of ions across it. e.g Sodium channels are gated for  movement  of sodium ions by voltage or ligands(chemicals) during  nervous  transmission to elicits action potential. Like wise Potassium channels allow  diffusion of potassium ions across the phospholipid bilayers. it gates are shut when sodium channels are open; this  regulate ion exchange.

Their structures are well fixed in shape , specific  to the substance or ions being  transported;and the rate of diffusion  depends on  the like hood of opening of the gate or closure.

Carrier molecules  also in the membranes  do not have a fixed shape, and their transport  direction is determined by the direction of concentration gradients. Thus they can flip on either sides of the membranes to aid diffusion across. Their movement can  be both passive and active, and the rates  of diffusion depends on the number of available carrier proteins in the membrane. They are also specific to the ions they transport.And are not gated,

Therefore these two membrane integral  proteins  facilitate movements of substances across the phospholipild bilayers

8 0
3 years ago
Protists are very diverse, and many different classification schemes have been used to define relationships between the protists
andrey2020 [161]

Answer:

D. heterotrophic by ingestion, pseudopods

Explanation:

Protists are generally classified  as all eukaryotic organisms that are not plants, animals or fungi. Example is amoeba, paramecium etc.They may be unicellular or multi cellular in nature.Most exist in colonies.

Their mode of nutrition can be photosynthetic or hetrotrophic. Hetrotrophic  protists   can be divided into  phagotrophs and osmotrops/saprotrophs. The phagotrophs  makes use of the cell body to engulf the food materials as  in amoeba ,carry out extracellular digestion before swallowing it.

Osmotrops absorbed dissolved food from surrounding liquid environments directly. (Some photosynthetic protists can also be heterotrophic.

Amoeboid movement is the mode of locomotion of protists and some  other eukaryotes. It involved the protrusion of cytoplasm, which exert pressure on the cell membrane to form pseudopodia and  the posterioly  evolved  <u>Uropods. </u>

<u />

<u>  </u>

<u>Sol-gel theory has been proposed to expalin this movements, The ectopalsm of amoeba is gelly-like , while the endiplams is less viscpus   and said to be sol. The interchange of the cytoplasmic fluis between the endo-and ecto plasm gives the SOL-GEL propulsion of the protopalms for the amoebic moveemnts .</u>

<u />

<u>The false feet(psuedopodium) drags the amoeba  along in the direction of the flow of the cytoplasm.</u>

Therefore option D is  the right option

4 0
3 years ago
Which process of mitosis is responsible for increasing the number of cells in your body?
Nataly_w [17]
Your question doesn't make sense. Mitisis IS the process by which humans grow, thus increasing the number of cells in the body. Mitosis is a process that includes 4 phases. What exactly are you asking?
3 0
3 years ago
Like rods, cone cells are depolarized when their opsin molecules are inactive. In the case of a cone, why might it be misleading
Olenka [21]

The most responsive of the three different types of cones to various light wavelengths. When light is present, a cone may become entirely depolarized if the sunlight is of a wavelength that is not optimal.

<h3>What do the eye's rods and cones do?</h3>

Rods are in charge of seeing in dimly lit environments (scotopic vision). They have poor spatial acuity and do not integrate color vision. Cones are responsible for color vision, high spatial acuity, and activity under higher light levels (photopic vision).

<h3>In the eye, how many rods are there?</h3>

The total number of rods inside the human retina (91 million) is significantly higher than the total number of cones, despite the fact human perception of average daytime ambient light is dominated by cone-mediated vision (roughly 4.5 million). As a result, over the majority of the retina, rod density is substantially higher than cone density.

To know more about the eye's rods and cones visit:

brainly.com/question/13285401

#SPJ4

5 0
1 year ago
How does the structure of a saturated fatty acid differ from an unsaturated fatty acid?
tia_tia [17]

Answer:

Saturated fatty acids have all of their carbon atoms bonded to hydrogen atoms.The lipids containing saturated fatty acid are solid at room temperature

Unsaturated fatty acids have some of their carbon atoms double bonded in place of hydrogen atoms.The lipids containing unsaturated fatty acids are liquid at room temprature.

Explanation:

I hope this will help you

6 0
3 years ago
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