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Gnoma [55]
3 years ago
5

A number of systems for pumping ions across membranes are powered by ATP. Such ATP-powered pumps are often called ATPases, altho

ugh they don't often hydrolyze ATP unless they are simultaneously transporting ions. Because small increases in calcium ions in the cytosol can trigger a number of different intracellular reactions, cells keep the cytosolic calcium concentration quite low under normal conditions, using ATP-powered calcium pumps. For example, muscle cells transport calcium from the cytosol into the membranous system called the sarcoplasmic reticulum (SR). If a resting muscle cell's cytosol has a free calcium ion concentration of 10-7 while the concentration in the SR is 10-2, then how is the ATPase acting?
A. ATPase activity must be powering an inflow of calcium from the outside of the cell into the SR.
B. ATPase activity must be transferring Pi to the SR to enable this to occur.
C. ATPase activity must be pumping calcium from the cytosol to the SR against the concentration gradient.
D. ATPase activity must be opening a channel for the calcium ions to diffuse back into the SR along the concentration gradient.
E. ATPase activity must be routing calcium ions from the SR to the cytosol, and then to the cell's environment.
Biology
1 answer:
docker41 [41]3 years ago
8 0

Answer:

The correct answer is C   ATPase  activity must be pumping calcium from Cytosol to the sarcoplasmic reticulam(SR) against their concentration gradient.

Explanation:

The concentration of Ca2+ ion in Sarcoplasmic reticulam of muscle is many times higher than that of Cytosol.

      Sarcoplasmic reticulam of muscle is a reservior of calcium ion (Ca2+) ions and after the occurance of muscle contraction Ca2+ are transported from low calcium concentration region that is cytosol to high calcium concentration region that is Sarcoplasmic reticulam through active transport by the help of ATPase enzyme.

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5 0
3 years ago
Witch nitrogen base sequence is the partner of c-a-t-c-g-a
Evgen [1.6K]

Answer:

G-T-A-G-C-T

Explanation:

A always pair with T and G always pairs with C.

4 0
3 years ago
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Which organism is not a eukaryote?
Nikolay [14]

Answer:

Eukaryotes are organisms whose cells contain a nucleus and other membrane-bound organelles. There is a wide range of eukaryotic organisms, including all animals, plants, fungi, and protists, as well as most algae. Eukaryotes may be either single-celled or multicellular. Eukaryotes are differentiated from another class of organisms called prokaryotes by way of the presence of internal membranes that separate parts of the eukaryotic cell from the rest of the cytoplasm. These membrane-bound structures are called organelles.

In eukaryotes, the cell's genetic material, or DNA, is contained within an organelle called the nucleus, where it is organized in long molecules called chromosomes. Eukaryotic cells also contain other organelles, including mitochondria, which generate energy; the endoplasmic reticulum, which plays a role in the transport of proteins; and the Golgi apparatus, which sorts and packages proteins and lipids for transport throughout the cell. Plant cells additionally contain organelles called chloroplasts, which are used to collect energy from sunlight.

Explanation:

Im a nature person.

5 0
3 years ago
Which of the following characteristics do not belong to the lumbar region?
ivolga24 [154]

Answer:

Explained below.

Explanation:

Each lumbar region of the spine is generally remembered as the lower back which contains 5 vertebrae. And the lumbar region is located between the chest or thoracic. And lumbar spine also typically holds a small internal curve as well.

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* Blunt spinous process

* Large size overall

* Bulky centrum

From the following, <u>the characteristic that does not belong to the lumbar region</u> are as follows;

* Elongated spinous process

7 0
3 years ago
List at least two possible reasons for the differences you see between the pinch strength of the first two fingers and the secon
andriy [413]

Answer:

The first two fingers may be stronger due to the fact that they are used the most often and could build up more strength and dexterity. Another reason the first two fingers may be stronger could be due to the fact that the ulnar muscle that controls digits 4 and 5 is smaller than the radial muscle.

Explanation:

Pinch strength is a widely used measurement of hand function. A direct relationship between pinch strength and function has been demonstrated and illustrates the importance of hand strength in clinical practice.There is a difference in grip strength in the dominant and non-dominant hands.Dominant hand  is significantly stronger. According to the pinch strength data, he index finger and the thumb are the strongest, the middle finger and the thumb are the second strongest, the ring finger and the thumb are the third strongest, and the little finger and the thumb are last. The difference is the largest between the middle finger and the thumb and the ring finger and the thumb.

The first two fingers may be stronger due to the fact that they are used the most often and could build up more strength and dexterity. Another reason the first two fingers may be stronger could be due to the fact that the ulnar muscle that controls digits 4 and 5 is smaller than the radial muscle.

Difference in the pinch strength may be due to one possible reason that the radial muscle is larger than the ulnar muscle which controls digits 4 and 5. Another reason could be that you generally use the thumb, index, and middle fingers more than the ring and little finger, therefore the first three fingers have more strength and muscle memory.

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