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givi [52]
3 years ago
13

Some cells contain large numbers of mitochondria while others have relatively few or none. this suggests that

Biology
2 answers:
Verdich [7]3 years ago
8 0
Cells with large numbers of mitochondria have a high energy demand
tigry1 [53]3 years ago
7 0

Answer:

Mitochondria is a double membrane organelle which is involved in the production of energy molecules of the cell called adenosine triphosphate or ATP.

The number of mitochondria in a cell is dependent on the function of the cell it is specialized to perform. For example:

1. The number of mitochondria in a muscle cell is very high as it requires a high amount of ATP molecules for contraction.

2. Mature red blood cells lack nucleus as they are specialized to perform carry oxygen molecules and do not require the ATP.

Thus, the number of mitochondria depends on the function of the cell.

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Guinea pig coat color is determined by a single gene. The allele for black coat color is dominant to brown. In a cross between t
Gwar [14]

Answer:

In a cross between two black-haired guinea pigs, 20 offspring are born. If both parents were heterozygous, probability would predict that approximately 1 out of 20 offspring would have brown hair

Explanation:

The two parents crossed were heterozygous dominant black coat color, after crossing 75% gives dominant black color coat while 25% gives only brown coat color homozygous

7 0
3 years ago
What was the purpose of adding methotrexate to the cells expressing a genetically-engineered Dihydrofolate Reductase enzyme in t
ira [324]

Answer:

Methotrexate inhibits the synthesis of DNA, RNA, and protein synthesis of the cells in the experiment.

Explanation:

Methotrexate competitively inhibits the enzyme dihydrofolate reductase (DHFR) which is involved in the synthesis of tetrahydrofolate from the inactive dihydrofolate. The methotrexate blocks the enzyme by binding to its active site thereby preventing further reaction of the dihydrofolate reductase enzyme and dihydrofolate. Tetrahydrofolate is a useful material for the de novo synthesis of thymidine, a nucleoside. And without thymidine, DNA synthesis is hindered. Methotrexate therefore inhibits the synthesis of DNA, RNA, thymidylates and of course protein synthesis.

5 0
3 years ago
Why do earthquakes often cause damaging fires
Sati [7]

Answer:

Earthquakes often cause damaging fires because they rupture gas lines and down power lines. This combination creates the fuel and ignition sources...

Explanation:

7 0
3 years ago
Primary succession is most likely caused by _______
MrRa [10]

Answer;

Volcanic eruption.


Explanation;

Primary succession is most likely caused by volcanic eruption.

it occurs in lifeless areas; such as regions in which the soil is incapable of sustaining life as a result of factors like lava flows, newly formed sand dunes, or rocks left from a retreating glacier.

The other type of succession is called secondary succession which occurs as a response to disturbance; such as forest fire, tsunami, flood, among others.


7 0
3 years ago
Read 2 more answers
Describe what homologous structures are and give an example.
Juliette [100K]
A homologous structure is a structure or organ that can be found on many different animals that suggest that there is a common ancestor. It can be anywhere from a bone to a flap of skin to an organ. A common one to look at is the similarity between a human hand, bat’s wing, whale anterior flipper, and a cat’s paw. All of these have a common, 5-point structure to the bones which suggests that we all come from an animal that had 5 fingers.
7 0
3 years ago
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