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m_a_m_a [10]
3 years ago
5

Mitochondria and chloroplasts are thought to have been ______.

Biology
2 answers:
yawa3891 [41]3 years ago
6 0
Mitochondria and chloroplasts likely evolved from engulfed prokaryotes that once lived as independent organisms.
(At some point, a eukaryotic cell engulfed an aerobic prokaryote, which then formed an endosymbiotic relationship with the host eukaryote, gradually developing into a mitochondrion. Eukaryotic cells containing mitochondria then engulfed photosynthetic prokaryotes, which evolved to become specialized chloroplast organelles).
Snezhnost [94]3 years ago
3 0

Free living prokaryotes

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A membrane which surrounds the genetic material and nucleus in eukaryotes cells
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The nuclear envelope, also known as the nuclear membrane, [a] is made up of two lipid bilayer membranes which in eukaryotic cells surrounds the nucleus, which encases the genetic material. The nuclear envelope consists of two lipid bilayer membranes, an inner nuclear membrane, and an outer nuclear membrane. The space between the membranes is called the perinuclear space.

8 0
3 years ago
5 uses of domestic animal
just olya [345]

Answer:

cows - They give us milk for calcium & gobar for gobar gas.

BUFFALO -They also give us milk.

dogs -They work as security in our house & they are faithful than others.

CAT- They catch mice from our home & keep our house clean.

GOAT - We domesticate them for the production of meat.

Explanation:

7 0
2 years ago
Read 2 more answers
The diagram represents one of Mendel’s laws or principles of inheritance. mc014-1.jpg Which law or principle does the diagram re
zhannawk [14.2K]
Segregation is the answer.
5 0
3 years ago
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How is cytokinesis different in animals and plants? Animal cells get pinched into two daughter cells by the cell membrane; the p
jasenka [17]
<h2><em>Let's review what cytokinesis is first.</em></h2>

<em>Cytokensis</em> is the <em>physical process of cell division</em>. It divides the cytoplasm of a parental cell into two different daughter cells.

In plants, a cell wall forms. Cytokensis occurs in mitosis and meiosis. The objective for cytokensis is to divide the parent cell into two daughter cells. So cytokensis in plants is when a cell wall forms in between the daughter cells. Plant cells have walls, so they CANNOT divide using a cleavage furrow. A cell plate forms across the cell during telophase.

In animal cells, cleavage furrow forms. This pinches the cell in half and forms two different cells.  

<em>A cleavage furrow is an indentation that appears in the cells surface when the cell is preparing to divide.</em>

So, let's review our options:

A: Animal cells get pinched into two daughter cells by the cell membrane; the plant cell has to form a cell plate before it can create daughter cells.

This would be the <em>correct answer.</em><em> </em>The only main difference between animal cell cytokensis vs plant cell cytokensis is the cell wall that animal cells lack. Animal cells get pinched into two daughter cells, by the cleavage furrow in the cell membrane, while the plant cell has to form a cell plate before it can create daughter cells.

B: Animal cells give daughter cells a full set of chromosomes at the time of division; plant cells give daughter cells a half set of chromosomes. .

This can be disproven. In meosis, a cell divides into four cells that have half the number of chromosomes. In mitosis, all chromosomes are kept. Both Plant & Animal cells both reproduce using both both meosis and mitosis, so this option is <em>irrelevant. </em>

C: Animal cells require an extra grow phase before cytokensis; plant cells move straight to cytokensis.

Both animal cells and plant cells have the same amount of "grow phases" before cytokensis. This option is<em> irrelevant. </em>

D: Animal cells begin cytokensis during anaphase, plant cells begin around the same time as telophase.

They both begin during the same time. This option is also<em> irrelevant.</em>

8 0
3 years ago
Read 2 more answers
Cytosine makes up 24% of the nucleotides in a sample of DNA from an organism.
Alchen [17]

Answer:

26%

Explanation:

if cytosine makes up 24%, then guanine also makes up 24%.

add these to get 48%.

subtract that from 100% to get a remaining 52%

then split the 52% between adenine and thymine to tell you that 26% is thymine

7 0
3 years ago
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