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baherus [9]
3 years ago
6

Why does a cell need to copy its DNA before it divides?

Biology
1 answer:
alexgriva [62]3 years ago
6 0

Answer:

A

Explanation:

It can't be B because during mitosis, sister chromatids inevitably are separated. It can't be C because they are copied so they have the same instructions and know what to do. A is the best choice.

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What role do the following codons (UGA, UAA, UAG) play in protein system
marshall27 [118]

Answer:

Signal the end of protein-coding sequences

Explanation:

The codons UGA, UAA, and UAG are known as stop codons. When the RNA is being translated to protein, and the RNAm reads those codons, it knows it has to end the protein sequence

4 0
2 years ago
A positive feedback loop, where the product signals for the production of more reactant, is maintained homeostasis.
OleMash [197]

False

Homeostasis is defined as the process of resisting change in order to maintain a stable environment. It typically involves negative feedback loops as these loops prohibits the change to occur in the human body system and maintain a constant internal environment. While positive feedback is the process of amplifying the stimulus produced within the body.

Homeostasis is thus regulated by negative feedback loops and rearely regulated by the positive feedback loops.


6 0
4 years ago
What in the body is locked up in water which is 70% of the body. Please help!!!
valkas [14]

Answer:

70% brain and about 60% of our body is water

7 0
3 years ago
How is heat in Earth's interior transferred by convection
motikmotik
Convection occurs over a very very long time in the earth's mantle.  Rock slowly gets melted down from the core, then shoots back up from volcanoes.  The new rocks get buried by sand and sediments, and the process resets.
4 0
4 years ago
If these organisms were arraigned in a food pyramid, which organism would have the least amount of total energy available?
Afina-wow [57]

The complete question is:

If these organisms were arraigned in a food pyramid, which organism would have the least amount of total energy available?

  • Producers
  • Carnivore
  • Herbivores
  • Top predators

Answer: Top predators

Explanation:

The top predators get the least energy because according to the 10 per cent law the energy transfer only 10 energy is transferred to the next successive level.

The next level of the organism receives only 10 of the total energy that the previous level has.

Hence, the top predators have the least amount of energy in it as the energy is transferred through various levels before reaching top predators.

7 0
3 years ago
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