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mestny [16]
3 years ago
14

What is the movement of molecules across a barrier such as the semi-permeable cell membrane called

Biology
1 answer:
PolarNik [594]3 years ago
3 0

Answer:

DIFFUSION

Explanation:

Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.

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(b) The antibiotic streptomycin inhibits protein synthesis in bacteria. If this antibiotic is added to a culture of animal cells
mixas84 [53]

Answer:

Mitochondrial ribosomes are similar to the prokaryotic ribosomes since mitochondria evolved by endosymbiosis. So, antibiotics can affect protein synthesis in mitochondria.  

Explanation:

Streptomycin is an antibiotic that controls bacterial growth by binding to the small ribosomal subunit (the 30S) of bacteria. Thereby, this antibiotic interferes with protein synthesis and causes misreading of mRNA. Mitochondria were evolved when an anaerobic prokaryote engulfed an aerobic prokaryote which in turn became symbiotic later and lost the ability to live freely.

The ribosomes of mitochondria are similar to the bacterial ribosomes and are inhibited by the presence of streptomycin. Therefore, streptomycin was directly able to inhibit the protein synthesis in mitochondria while not affecting the same process in the cytosol of the cell.

4 0
3 years ago
An atom that has 19 protons, 21 neutrons, and 18 electrons has a mass of ____? *
Paul [167]

Answer:

19 - Potassium - K.

Explanation:

3 0
2 years ago
Why are plants considered as crucial in the maintenance of balance in the ecosystem?
serg [7]

Plants are very crucial for maintenance of balance of ecosytem as part of the equilibrium and the primary basis for the ecosystem as the producers.

Explanation:

The ecosystem consists of plants with animals and the environment surrounding it. The balance of all three elements is essential for the co existence of the ecosystem. devoid of any or excess of either factor will lead to destruction.

The imbalance so caused will lead to over production or over consumption of the strata in the ecosystem. Plants holds the producer level of the ecosystem which forms the basis to all, if dis-balanced all the factors relying on it will decline eventually and the world will fall.

7 0
3 years ago
What are the functions of the digestive system?
Len [333]

Answer:

The function of the digestive system is digestion and absorption.

Explanation:

Digestion is the breakdown of food into small molecules, which are then absorbed into the body.

5 0
3 years ago
What do bacteria have in common with the cells of other living organisms?
butalik [34]

Answer:

Summary. Bacteria are like eukaryotic cells in that they have cytoplasm, ribosomes, and a plasma membrane. Features that distinguish a bacterial cell from a eukaryotic cell include the circular DNA of the nucleoid, the lack of membrane-bound organelles, the cell wall of peptidoglycan, and flagella.

4 0
3 years ago
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