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Vadim26 [7]
3 years ago
14

A colleague gives you two tubes containing membrane fractions from an animal cell lysate. One tube contains the plasma membrane

fraction, and the other tube contains the mitochondrial inner membrane fraction, but the tubes are not labeled. When you analyze the macromolecule composition of the samples, you are confident that the second tube contains the mitochondrial fraction, because the sample has
A) a higher ratio of cholesterol to phospholipids.B) a higher protein to lipid ratio.C) a lower protein to lipid ratio.D) more carbohydrate in glycoproteins.E) more GPI-anchored proteins.
Biology
1 answer:
OLga [1]3 years ago
6 0

Answer:

B) a higher protein to lipid ratio.

Explanation:

The cell membrane of eukaryotes is known to be a phospholipid bilayer with embedded proteins.  This implies that the first tube will contain a higher amount of lipids.

The membrane of the mitochondria is slightly different from the cell membrane in which its protein to lipid ratio is higher, containing a large number of integral proteins.

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Robert Hooke.

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3 years ago
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Reflex activity can be modified by the cerebral cortex. For example, you are baking a roast in the oven. As you are moving the r
Zanzabum

Answer:

There are different types of reflexes, and some of them can be controlled voluntarily due to cortical processing.

Explanation:

Even if there is an initial myotactic reflex of moving away from the heat, the cortical processing that is subject to learning makes you not let go of the pan. It should be noted that there are different types of reflexes, and not all postural reactions are automatic. The cerebral cortex influences voluntary postural adjustment movements. Such control is mainly performed by the brain stem, where ocurrs the modulation of motor neurons and spinal cord interneurons through the lateral descending (fine movements) and medial (posture and balance) downward pathways.

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3 years ago
Sediment deposited where a river flows into an ocean or lake
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Answer: food plain

Explanation:

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3 0
2 years ago
Compared to freshwater fishes, marine fishes: drink seawater and produce a large volume of urine. do not drink seawater in an ef
Andre45 [30]

Answer:

The correct answer is - tend to lose water by osmosis since their internal salt concentration is lower than that of seawater.

Explanation:

In freshwater fishes, the body of fishes has a higher salt concentration inside their body than the surrounding water, water enters through the osmosis process. Without any active regulation of this process, fishes would swell and get bigger and bigger. They have specialized cells called chloride cells in gills to take ions from water as they do not have kidneys.

In contrast, the marine fishes have a lower salt concentration in their body than surrounding water of sea or ocean and they lose water continuously and to compensate for this they need to drink water regularly.

6 0
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