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ANEK [815]
3 years ago
14

Which scientists was the first to suggest that growth of cancerous cells was a result of abnormal chromosomes?

Biology
1 answer:
vagabundo [1.1K]3 years ago
5 0

Answer:

b. Theodor Boveri  

c. Walter Sutton

Explanation:

Sutton and Boveri's simple idea, known as the chromosomal theory of heredity, admits that chromosomes are the physical support of genes. From this idea, fields of research and knowledge that marked the whole of the twentieth century and which have repercussions until today.

From this idea it was possible to propose the constitution of tumor cells, deducing that malignant cell anomalies were consequences a modification of hereditary heritage, elaborating a pioneering hypothesis of the genetic origin of cancers.

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What is the relationship between natural selection and mutations?
dem82 [27]

Mutation can cause instant adaptation while natural selection is the process by which adaptation occurs over a series of generations.

6 0
3 years ago
2. Suggest two ways that reflex reactions help maintain homoeostasis in the human body.
Nata [24]
<span>One reflex reaction to maintaining homeostasis in the body is shivering. In response to cold temperatures, the muscular system moves our muscles quickly to warm them up as a rapid, short term solution for homeostasis. Another example is the withdrawal reflex, which occurs as a response to pain. Pain receptors activated by the painful stimulus activate the motor neurons in the body, which in turn contract muscles to move parts of your body away from the pain.</span>
7 0
2 years ago
Of the answers below, what is the smallest nucleotide sequence that could code for a protein with 300 amino acids?
ololo11 [35]
The nucleotide sequence would have to have 900 nucleotides in order to code for a protein of 300 amino acids. When translating RNA into proteins, RNA is read 3 bases at a time. Each group of 3 bases is a codon, and each codon codes for an amino acid. When read, the proper amino acid is added to a growing chain of amino acids, which will be folded to become a protein.

Therefore, 300 amino acids * 3 nucleotides per amino acid = 900 nucleotides.
6 0
3 years ago
Know what makes a solution acidic or basic (the pH number and the ions).
Brrunno [24]

To determine whether an acidic or basic solution, it is first necessary to compare the concentrations of the hydronium (H3O +) and hydroxide (OH-) ions in the solution.

In acidic solution, the concentration of H3O + ions is higher than that of OH- ions.

  • In acidic solution, the concentration of H3O + ions is higher than that of OH- ions. Such a solution can be achieved by adding a small part of the H3O + ions, for example. Acid solutions have a pH below 7, the further away from 7 the pH of the solution is the higher its acidity content.  According to Le Chatelier's principle, when a disturbance is caused to an equilibrium system, it tends to readjust in order to diminish the effects of that force. This means that if an acid is added to water, the H3O + ions will be in excess and the equilibrium will shift in the opposite direction to the left. Then these excess ions will react with the OH- ions. Thus, the concentration of OH- ions will decrease and the solution will become acidic.
  • In basic solutions, the concentration of OH- ions is higher than that of H3O + ions.  If we add a base to the water, it means that we will be adding OH- ions and, as explained in the previous section, by Le Chatelier's principle, the equilibrium of the water selfionization reaction will shift in the opposite direction, and the excess ions will react. with the H3O + ions, decreasing their concentration and making the basic solution.  Basic solutions have a pH greater than 7, the farther from 7 and closer to 14 the pH of the solution, the higher the basification content.

8 0
2 years ago
What are the chances that a cross between a black chicken and white chicken will result in blue offspring?
Shkiper50 [21]

The correct answer is 100%

This is because Back and white are both incomplete dominant traits. When you cross these together, all (100%) of the offspring will be heterozygous blue.

I just took the test on USATestPrep, so I guarantee you that is correct!

Have a great day! :)

4 0
3 years ago
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