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erastova [34]
2 years ago
7

UN

Biology
1 answer:
Lapatulllka [165]2 years ago
5 0

Answer:

im not doing that sorry,

Explanation:

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Whales have what seem like remnants of a pelvis and femur, as shown here. mc013-1.jpg What are these structures an example of?
Ainat [17]

Answer : Option C) vestigial structures.

Explanation : In the example of whales which is displaying the remnants of the pelvis and femur bones it seems to be the example of vestigial structures.

As vestigial structures are those anatomical feature which no longer seems to have a purpose in the current form of an organism of the given species.

7 0
2 years ago
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Your lab group is experimenting with the diffusion of molecules across a membrane. Dialysis tubing is used as a model cell membr
Margaret [11]

Answer: the membrane channel

Explanation:

In passive diffusion, the small water molecules can move across the phospholipid bilayer seen in blue. This layer acts as a semi-permeable or selectively permeable membrane; its hydrophilic heads are attracted to water (seen facing outwards) while its water-repellent hydrophobic tails face towards each other- allowing  molecules of water to diffuse across the membrane along the concentration gradient.

Thus the water will move from an area of high concentration  to an area of low concentration, until the system reaches a steady state called equilibrium- after this, there will be no net movement of water. Similarly via osmosis, the water passes through the membrane due to the difference in osmotic pressure on either side of the phospholipid bilayer this means that the water moves from regions of high osmotic pressure/concentration to regions of low pressure/ concentration to a steady state.

The dialysis tubing mimics a semi permeable membrane; it only allows water and small molecules of iodine to cross into the bag containing starch. The tubing is impermeable to starch;  these large molecules require the aid of protein omplexes called membrane channels, in order to move across the membrane and against the concentration gradient.

5 0
3 years ago
Which of the following does not rely on active transport to cross the cell membrane? A.calcium ions B.water molecules C.potassiu
shepuryov [24]

i think it is b becuase it gives a lot of infor mation

8 0
3 years ago
What is the difference between an Eukaryotic cell and a Prokaryotic Cell?
stepan [7]

Answer:

i d k

Explanation:

i d k

6 0
2 years ago
Describe a stoma, and relate the function of the stoma to your description.
stepladder [879]

Answer:

BOTONY:

any of the minute pores in the epidermis of the leaf or stem of a plant, forming a slit of variable width which allows movement of gases in and out of the intercellular spaces.

MEDICINE :

an artificial opening made into a hollow organ, especially one on the surface of the body leading to the gut or trachea.

Explanation:

3 0
3 years ago
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