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n200080 [17]
2 years ago
13

What structures of a living cell are not visible?

Biology
1 answer:
alisha [4.7K]2 years ago
6 0
We were not able to see microtubules, centrioles, rough endoplasmic reticulum, smooth endoplasmic reticulum, plasma membrane, ribosomes, golgi apparatus, vesicle, mitochondrion and chloroplast.
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[20pts]
zysi [14]
The cell is most likely a prokaryote
A type of cell with no nucleus
8 0
3 years ago
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A marine ecologist counts the number of crabs in three different intertidal regions that are each two hectares. The crab counts
romanna [79]

Answer:

Density is nearly 3 cabs per hectare

Explanation:

Given -

There are three three intertidal regions.

Area of each intertidal region is 2 hectares.

Number of crab in the intertidal regions are as follows -

Intertidal region I - 7

Intertidal region I - 2

Intertidal region I - 6

Sum of crabs in all three regions is equal to

7 + 2+ 6\\= 15

Total area of all three intertidal regions is equal to

2 + 2+ 2\\= 6 hectares

Now density per hectare is equal to total population of crab divided by total area of all the three intertidal regions

Density = \frac{15}{6} \\= 2.5

Density is nearly 3 cabs per hectare

5 0
2 years ago
Marco has experienced extreme fatigue (tiredness) lately. He eats three balanced meals each day and exercises 2-3 times per week
Kisachek [45]

Given the symptoms shown by Marcos, we can infer that the organelle that may be causing his problems is the mitochondria.

The mitochondria are one of the most famous and important organelle within a cell. Found in most eukaryotic cells, they are the organelle responsible for most of the energy production of a cell, and throughout the cells of the body, they become responsible for the energy production of the organism. This is the origin of its famous <em>"</em><u><em>Powerhouse of the cell</em></u><em>"</em> title. Mitochondria produce energy in the form of ATP.

ATP is a molecular compound necessary for most of the reactions that take place in a cell. It is so common as a requirement for any cellular activity that ATP is known as the "molecular currency". Marcos is said to be experiencing chronic fatigue, which is a symptom of mitochondrial disease. When the mitochondria of an organism's cells are not functioning as they should be, the cells do not have the energy needed to perform basic functions.

In reaction to this, the body sends signals to the brain to go to sleep, which minimizes energy consumption by slowing down the metabolic processes which require ATP and thus gives the body time to produce more energy. For these reasons, we can conclude that the fatigue and problems Marcos is experiencing are due to mitochondrial disease.

To learn more visit:

brainly.com/question/1563697?referrer=searchResults

8 0
3 years ago
WILL BE MARKED BRAINLIEST!!!!
Alexxandr [17]

Answer: Option E) polar

Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are polar

Explanation:

Amino acid-derived and peptide hormones such as serotonin, epinephrine, dopamine etc, are unable to diffuse across a cell membrane because they consist of several repeating units of amino acids with positively charged or negatively charged side chains.

Thus, the side chains make these hormones water-loving (hydrophilic), and impassable to the hydrophobic layer of the cell membrane.

5 0
3 years ago
HELP ANSWER IS I NEED TO STUDY PLZ!<br>what are three characteristics of an invasive species​
Kamila [148]

Answer:

Harmful to the existing habitat and inhabitants

Foreign

Fast reproduction rate

7 0
2 years ago
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