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OlgaM077 [116]
3 years ago
7

2. While looking at a cell under a microscope, a scientist is able to see a biological molecule. This molecule is a nucleic acid

with a ladder structure and contains the nitrogenous bases adenine, thymine, cytosine, and guanine. Based on this information, what conclusion can the scientist draw regarding this nucleic acid?
(A)The nucleic acid is DNA and would be found in the cell’s nucleus.
(B)The nucleic acid is DNA and would be found in the cytoplasm.
(C)The nucleic acid is RNA and would be found in the cytoplasm.
(D) nucleic acid is RNA and would be found in the cell’s nucleus. ...?
Biology
2 answers:
I am Lyosha [343]3 years ago
8 0

The correct answer is A

The scientist can determine that this nucleic acid is a DNA molecule, because it contains Thymine, which does not occure in the RNA molecule. The RNA molecule contains Adenine, Guanine and Cytosine just like the DNA, but unlike the DNA it contains Uracil, not Thymine.

Secondly, the scientist can say with certainty that this DNA molecule is surrounded by a nucleus based on the structure of the nucleic acid described. Only eukaryotic cells have ladder structure. The prokaryotic cells have circular DNA and do not have any organelles, like the nucleus. Therefore, from the ladder structure of the DNA the scientist can see that the cell has a nucleus.

Vsevolod [243]3 years ago
8 0
Based on the given description above, the correct answer would be option A. The <span>conclusion that the scientist can draw regarding this nucleic acid is that t</span>he nucleic acid is DNA and would be found in the cell’s nucleus. N<span>ot RNA since RNA has Uracil instead of Thymine and </span><span>DNA is always in the nucleus. Hope this answer helps.</span>
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Jane starts to blink her eyes when her brother shines a flashlight at her. Why does Jane start blinking her eyes?
jek_recluse [69]
The correct option is this: BECAUSE OF A SPINAL REFLEX.
Reflex action refers to the involuntary movement of any part of the body when such a part receive a stimulus. The response to reflect action is always immediate and it occurs without the consent of the affected person. Examples of reflex action is the contraction of the pupils when light shines in one's eyes and the quick withdrawal of one's hands when one touch a hot object. 

8 0
4 years ago
A spheroidal bacterium with a diameter of 1 mm contains 2 molecules of a particular protein. What is the molar concentration?
creativ13 [48]

Answer : The molar concentration is, 6.35\times 10^{-18}mol/L

Explanation :

First we have to calculate the moles of protein.

\text{Moles of protein}=\frac{\text{Number of molecules of protein}}{\text{Avogadro's number}}

Number of molecules of protein = 2 molecules

Avogadro's number =  6.022\times 10^{23}molecules/mol

\text{Moles of protein}=\frac{2\text{ molecules}}{6.022\times 10^{23}molecules/mol}=3.32\times 10^{-24}mol

Now we have to calculate the radius.

Radius = \frac{Diameter}{2}=\frac{1mm}{2}=0.5mm=5.0\times 10^{-4}m

Conversion used : (1 mm = 0.001 m)

Now we have to calculate the volume.

V=\frac{4}{3}\pi r^3

V=\frac{4}{3}\times 3.14\times (5.0\times 10^{-4}m)^3

V=5.23\times 10^{-10}m^3=5.23\times 10^{-7}L

Conversion used : (1 m³ = 1000 L)

Now we have to calculate the molar concentration.

Concentration=\frac{\text{Moles of protein}}{\text{Volume}}

Concentration=\frac{3.32\times 10^{-24}mol}{5.23\times 10^{-7}L}

Concentration=6.35\times 10^{-18}mol/L

Thus, the molar concentration is, 6.35\times 10^{-18}mol/L

4 0
3 years ago
Explain
Tema [17]
Black squirrels may increase in a certain area due to natural selection because of the ground below it being dark so the squirrels would adapt to the terrain, making them harder to see by predators.
EXAMPLE: if a light fur colored squirrel is on a dark terrain, an Owl or Large bird could easily see the color differentiation and notice that it is a small land organism (prey).
So the squirrels kin would evolve in the sense that they would have darker fur to match their inhabitance
6 0
3 years ago
Help Please...Needed Quickly
Alex787 [66]

answer 1:

Environmental Pollution occurs in different forms; air, water, soil, radioactive, noise, heat/ thermal, and light

Air Pollution

Water Pollution

Soil pollution

Noise pollution

Radioactive pollution

Light pollution

Humans are the main cause of water pollution, which is triggered in many ways: by the dumping of industrial waste; due to temperature rise, that cause the alteration of water by reducing the oxygen in its composition; Or due to deforestation, which causes sediments and bacteria to appear under the soil

Most of this air pollution we cause results from the burning of fossil fuels, such as coal, oil, natural gas, and gasoline to produce electricity and power our vehicles. Carbon dioxide (CO2) is a good indicator of how much fossil fuel is burned and how much of other pollutants are emitted as a result.

Effects:

Nutrient pollution can cause toxic algal blooms in drinking water sources that create toxins that kill fish and other aquatic animals. Direct exposure to this toxic alga causes serious health problems in humans including neurological effects, respiratory problems, stomach and liver illness, and rashes.

answer 2:

The Industrial Revolution brought rapid urbanization or the movement of people to cities. Changes in farming, soaring population growth, and an ever-increasing demand for workers led masses of people to migrate from farms to cities. Almost overnight, small towns around coal or iron mines mushroomed into cities.

anwer 3:

advantages are

1_A Fuel Supply That Never Runs Out

2_Zero Carbon Emissions

3_Cleaner Air and Water

4_A Cheaper Form of Electricity

5_Renewable Energy Creates New Jobs

disadvantages are

1_Higher Capital Costs

2_Electricity Production Can Be Unreliable

3_Energy Storage Is a Challenge

4_It’s Impacted by Environmental Conditions

5_Renewables Still Have a Carbon Footprint

anwer 4:

Hazardous waste can be treated by chemical, thermal, biological, and physical methods. Chemical methods include ion exchange, precipitation, oxidation and reduction, and neutralization. Among thermal methods is high-temperature incineration, which not only can detoxify certain organic wastes but also can destroy them.

answer 5:

You could do this by:

1_Try to stay away from disposable goods. In particular, paper plates, cups, bottles, and plastic utensils.

2_Buy durable and reusable goods. ...

3_Pack your lunch in a reusable box rather than foil or cling film.

4_Buying products with less packaging. ...

5_Buying products in bulk.

I WISH THIS WILL BE HELPFUL, GOOD LUCK :)

3 0
2 years ago
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Annette [7]

Answer:

The answer is mitochondrion.

6 0
3 years ago
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