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iren2701 [21]
3 years ago
7

Which of the following statements about mitochondria is TRUE? A. The outer mitochondrial membrane is impermeable to ions and sma

ll molecules. B. Mitochondria are small round organelles that are often associated with actin filaments of the cytoskeleton. C. In sperm cells, mitochondria are seen wrapping tightly around the nucleus. D. Mitochondria are large enough to be seen with modern light microscopy, and can occupy as much as 20% of cytoplasmic volume.
Biology
1 answer:
Zanzabum3 years ago
8 0

Answer:

D. Mitochondria are large enough to be seen with modern light microscopy, and can occupy as much as 20% of cytoplasmic volume.

Explanation:

Mitochondria are oval shaped organelles responsible for cellular respiration.

One of their defining characteristics

is the influx of protons from the mitochondrial membrane that enables ATP synthesis.

Mitochondria are known as the power house of the cell.

Structurally, mitochondria are spherocylindrical with a length of 2 microns and a diameter of 1 micron.

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Answer:

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2 years ago
The purpose of mitosis includes all of the following EXCEPT
Mnenie [13.5K]
The answer is B.
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3 years ago
Choose the true statement(s) that support(s) the endosymbiotic theory. To be marked correct, you'll need to select all true stat
horsena [70]

Answer:

a.Many mitochondrial genes resemble proteobacteria genes, while the genes in the chloroplast resemble genes found in some photosynthetic bacteria.

c.Mitochondria and chloroplasts both have their own circular DNA and 70S ribosomes that are similar to those found in bacteria.

d.Mitochondria and chloroplasts replicate by a process similar to mitosis.

Explanation:

Endosymbiotic theory states that mitochondria and chloroplast which are organelles of eukaryotic cells were once independently living micro-organisms but with due course of time eukaryotic cells engulfed them and they become an integral part of these eukaryotic cells.

The resemblance between mitochondrial genes with those of proteobacteria and chloroplast genes with photosynthetic bacteria strongly support endosymbiotic theory. Apart from this, the presence of their own DNA that too circular just like prokaryotic microbes and 70 S ribosomes also support this theory. Also just like prokaryotic cells, before cell division mitochondria and chloroplasts undergo replication by means of a process known as binary fission.

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