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Mnenie [13.5K]
3 years ago
6

Which is an example of mechanical digestion that occurs in the human digestive system?

Biology
1 answer:
Effectus [21]3 years ago
3 0

Answer:

Saliva in the mouth acts to moisten and break apart food molecules

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The scientist who determined that all animals are made out of cells was.
r-ruslan [8.4K]

Answer:

German Zoologist discovers Theodor Schwann that animal were made from cell

6 0
2 years ago
Animals cannot synthesize tyrosine from shikimate-3P because they lack EPSP synthase. However, tyrosine is listed as a non-essen
Marina86 [1]

Tyrosine is listed as a non-essential amino acid because it can be synthesised from the essential amino acid phenylalanine.

<u>Explanation:</u>

Amino acids are classified as essential and non essential according to whether they can be synthesized in the body itself or should be supplied by the diet. Essential amino acids cannot be synthesized in the body of the organism and thus can be obtained only from the diet. In the case of human beings, valine, phenylalanine, methionine etc are examples of essential amino acids.

Non essential amino acids can be synthesized within the body of the organism. Thus they need not be supplied by the diet. Alanine, aspartic acid etc are some of the non essential amino acids in human beings. It is given here that animals cannot synthesize tyrosine from shikimate-3p due to the lack of EPSP synthase.

But the amino acid tyrosine can be synthesized from the amino acid phenylalanine which is an essential amino acid. Thus tyrosine will be a non-essential amino acid.

8 0
3 years ago
In your own words describe three key features of a fair test
Ainat [17]

Answer:

In a fair test two or more things are compared. In order for a test to be fair or scientifically sound, children are required to ensure only one thing (this is called a variable) is changed.

For example, if testing which material is the most waterproof by pouring liquid onto a selection of different materials, in a fair test only the type of material (the component you are testing) should be changed. Therefore all other elements (the type of liquid used, the amount of liquid used, the distance the liquid is poured from, the speed at which it is poured and the size of the material) must remain the same each time the test is carried out. It would be unfair or an unscientific test if, for example, 1000ml of water were poured onto a piece of foil and 2ml of milk poured onto a piece of foam – you would not be able to fairly compare the materials. 

hope this will help you!!!.....

3 0
2 years ago
Read 2 more answers
Duchenne muscular dystrophy (DMD) is caused by a relatively rare X-linked recessive allele. An affected man mates with his unaff
Citrus2011 [14]

Answer:

A. Grandmother.  

B. 0

Explanation:

A. If there is no history of the disease in the family, there were only female unaffected genetic carriers. Duchenne muscular dystrophy is a recessive disease linked to the X chromosome, all man with the mutation will display the disease, since they have only one X chromosome (XY). Women have XX, so, if they inherit an abnormal dystrophin gene, but they have a normal allele on the other X chromosome, they won´t develop the muscular dystrophy.  

B. The problem does not state that the woman is a carrier, so, the probability of having a child affected is zero. The disease is linked to the X chromosome, so, sons will not be affected, and daughters would have a copy of the mutated gene, but will not display the symptoms.  

4 0
3 years ago
Compare and contrast respiration In insect and fish?​
sertanlavr [38]

Answer:

insect is small and lives on land and the fish lives in water

Explanation:

..................

5 0
3 years ago
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