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allochka39001 [22]
3 years ago
15

Which substance is harmful in drinking water at any amount?

Biology
2 answers:
yaroslaw [1]3 years ago
5 0

Answer:

B

Explanation:

Its a poison stay away from it no matter how much it is

kramer3 years ago
4 0
The answer should be a or b .
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Please help asap , i’ll appreciate a lot :)
Harrizon [31]

Answer:

polymers

Explanation:

mono is the prefix for one

poly is the prefix for many

6 0
3 years ago
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Can someone please help me . Science ~
kupik [55]

Answer:

<h3><em><u>Archaea</u></em></h3>

Explanation:

Archaea contains DNA not held in a nucleoid or nucleus. They tend to live in harsh temperatures/climates and are found in thermal vents, and they can survive on certain non-organic substances.

Now bacteria contains a nucleoid which holds the DNA, and Eukarya (plant and animal cells) also have DNA but have membrane-bound organelles that are like nucleus.

5 0
4 years ago
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Which type how many chromosomes are in a normal human karyotype?
Bumek [7]
Each human cell contains 46 chromosomes.
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3 years ago
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A farmer crosses a purple-flowered pea plant with a white-flowered pea plant and plants the seeds. The farmer observes that all
Musya8 [376]

Note about the question:

Probably there are options for this question, but I failed in finding them. However, in the explanation box I will explain the reason for the lack of white flowers in the F1.

Answer:

The purple phenotype is dominant over the white phenotype. The allele that expresses the purple color is dominant and, in a heterozygous state, hides the expression of the recessive allele that expresses the white color. Principle of dominance.

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
6 0
3 years ago
what are the roles of cyclins and cyclin-dependent kinases during the cell cycle? how do perturbations of the cell cycle checkpo
Salsk061 [2.6K]

To activate the kinases, cyclins connect to them. The activity of cyclin-dependent kinases changes with cyclin concentration. At the G2 phase, Cyclin and a Cdk unite to start mitosis (M phase). This mixture produces MPF (maturation-promoting factor), which encourages the cell to continue mitosis through the M phase. The cyclin is broken down at the G1 phase, and the Cdk is recycled.

<h3>What about cyclins?</h3>
  • A family of regulatory proteins known as cyclins manages how the cell cycle develops.
  • Cyclins cause the phosphorylation of cyclin dependent kinases (CDKs), which regulate the cell cycle.
  • A target protein will attach to a complex made up of a cyclin and a CDK, and the complex will phosphorylate the protein.
  • Cyclins collaborate with an enzyme family known as the cyclin-dependent kinases to control the cell cycle's activities (Cdks).
  • A Cdk that is not bound to a cyclin is inactive, but when it is, it becomes a functioning enzyme that can alter target proteins.
  • By phosphorylating and inactivating target substrates, cyclins are the regulatory subunits of holoenzyme CDK complexes that control progression through cell-cycle checkpoints.
  • Cyclin-dependent kinases (CDKs) are protein kinases that require a distinct subunit - a cyclin - that provides domains necessary for enzymatic action.
  • The cyclins associate with various CDKs to offer specificity of function at various stages during the cell cycle.
  • In response to various extracellular and intracellular signals, CDKs modify transcription and play significant roles in the regulation of cell division.

Learn more about cyclins here:

brainly.com/question/931366

#SPJ4

3 0
1 year ago
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