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Leokris [45]
3 years ago
15

The structure that removes water from cell of euglena is​

Biology
1 answer:
elixir [45]3 years ago
7 0

Answer: the contractile vacuole

Explanation: The contractile vacuole is a star-like structure located toward the cell's posterior. This organelle aids the cell in the removal of excess water. Without it, the euglena would be able to absorb so much water through osmosis that the cell would burst.

Hope that helps

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Mutations only occur in somatic cells. True or False?
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In the lab, you isolate a chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating
balandron [24]

Answer:

Option B, no, because the xanthophylls prevent the production of reactive oxygen species.

Explanation:

Complete question

In the lab, you isolate a chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. if you released that mutant into a small pond shaded by trees, would the mutation spread, and why?

a) yes, because the xanthophylls prevent the production of reactive oxygen species.

b) no, because the xanthophylls prevent the production of reactive oxygen species.

c) no, because xanthophyll dissipates absorbed light as heat, and in low light environments, such dissipation would decrease photosynthesis and therefore growth.

d) yes, because the heat released by the xanthophylls would warm up the cells and enhance photosynthesis.

e) no, because mutations never spread in nature

Solution

Xanthophylls are oxygenated carotenoids which are very essential for photosynthesis of plant. They play a major role in harvesting light and in photoprotection. The structure of xanthophyll consists of conjugated double bonds and they are good at facing  reactive oxygen species (such as cholera vector) thereby damaging their DNA, restricting the cellular pathways by damaging the oxidation pathway. Hence, in presence of reactive oxygen species the light received by xanthophylls is not used to in photosynthesis but in quenching the reactive oxygen species .

Hence, option B is correct

 

6 0
3 years ago
Which of the following statements about magnesium atoms is NOT correct? 1. All magnesium atoms have the same number of protons.
Fantom [35]

Answer:

5. All magnesium atoms have the same number of neutrons

Explanation:

Magnesium (Mg) is a chemical element. Its atomic number (Z) is 12 (number of protons in the nucleus of the Mg atom).

The Magnesium has three stable isotopes: 24Mg, 25Mg and 26Mg. All these isoforms have 12 protons in their atoms (same atomic number), however they  vary in the mass number of the atom (M).

The mass number of the atom (M) is equal to the sum of protons and neutrons in the nucleus.

Based on this information we can know how many neutrons each isotope has

24 Mg = 12 protones + 12 neutrons

25Mg = 12 protones + 13 neutrons

26Mg = 12 protones + 14 neutrons

In this way we conclude that <u>not all magnesium atoms have the same number of neutrons</u>

5 0
3 years ago
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