Answer:
B) The covalent N-glycosidic bond between the base and the pentose breaks
Explanation:
When forces that bind 2 DNA strands are broken, these strands finally split. This process is called denaturalization
The main forces that remain both DNA strands together are the hydrogen bonds (physical forces), between pair of bases (Adenine with Thymine, and Guanine with Cytosine)
Denaturalization may occur by different factor: Ph alteration, salt addition, temperature (heating), etc
When heating a DNA solution, denaturalization process may be followed using UV absorption (normally, at wavelength of 260 nm): when DNA (double strand) has its regular structure, UV light absorption is low, as the nitrogen bases are stacked like a pile of coins, for which structure absorbs less light
When DNA structure is denaturalized, these nitrogen bases are exposed, and UV absorption increases
Also, DNA denaturalization may be followed by viscosity: for a double strand DNA solution, viscosity is high due to double chain stiffness but when strands are denaturalized, simple strands solution are less viscous (so viscosity decreases over time, when heating the solution)
Lastly, when solution is heated, only physical forces are broken (hydrogen bonds) and not chemical bonds (such as covalent bonds), for which extreme conditions are needed
Answer:
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
Explanation:
We need to convert each value into moles, a count of the number of atoms/molecules.
a) 1.0 moles He
b) 0.60 moles H2
c) 20 grams K: convert to moles with the molar mass of K
(20 grams K)/(39.1 g/mole K) = 0.511 moles K
d) 8.5 mL H2O (density of H2O = 1 g/mL).
Find the mass of the H2): (8.5 ml)*(1 g/ml) = 8.5 grams H2)
Now calculate moles H2): (8.5 grams)/(18 grams/mole) = 0.473 moles H2O
e) 22.6 g KMnO4
(22.6 g KMnO4 )*(158.0 g/mole) = 0.143 moles
Now we need to take into account the number of atoms per molecule:
Molecule Atoms/Molecule Moles Atoms(moles)
He 1 1.0 1.0
H2 2 0.60 1.2
K 1 0.51 0.51
H2O 3 0.47 1.41
KMnO4 6 0.143 0.86
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
The solution that when mixed with a drop of bromthymol blue will change the indicator to yellow is A. 0.1 M HCl.
An indicator simply means a substance that has measurable and observable characteristics that is important to depict an acidic or alkaline substance.
In this case, the solution that when mixed with a drop of bromthymol blue will change the indicator to yellow is 0.1 M HCl.
Learn more about indicators on:
b. results in "smokers breath."
c. can lead to premature aging.
Smoking marijuana can be as unhealthy as smoking cigarettes and can cause cancer.
a. can cause cancer.
Smoking marijuana can be as unhealthy as smoking cigarettes, and it can cause cancer. Marijuana smoke contains many of the same harmful chemicals as cigarette smoke, including tar, carbon monoxide, and carcinogens. These chemicals can damage DNA and lead to the development of cancer.
In addition to cancer, smoking marijuana can also lead to other health problems, such as respiratory problems, heart disease, and lung infections. It can also impair cognitive function and increase the risk of accidents.
The other options, b. results in "smokers breath" and c. can lead to premature aging, are also possible effects of smoking marijuana, but they are not as serious as cancer.
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Three ways to change the rate of a reaction are by increasing the concentration of reactants, changing the temperature, and adding a catalyst.
Three ways to change the rate of a reaction:
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The three main ways to change the rate of reaction based on principles that affect rates of reactions are concentration, temperature, and catalysts .let us describe them one by one further.
Three ways to change the rate of a chemical reaction are:
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b. global carbon budget
c. global oxygen budget
d. global respiration budget
Answer: Global carbon budget.
Explanation: The global carbon budget can be defined as the budget that balances the fluxes of carbon between the four reservoirs. These four reservoir of carbon are Earth's terrestrial biosphere, hydrosphere, atmosphere and geosphere.
The total amount of carbon on the earth should be maintained so there is a global carbon budget that maintains the amount of carbon on earth.
important nutrients needed by fish in the aquatic
environment to survive.
Which scenarios may be explained by the facts on
the left? Check all that apply.
ID There is more dissolved oxygen in colder
waters than in warm water.
IM
Fact 2: Unlike solids, whose solubility increases
with increasing temperature, the solubility of gases
generally decreases with increasing temperature.
IND
There is less dissolved oxygen in colder
waters than in warm water.
Fish life in the ocean is more abundant during
the seaons with warmer water than seasons
with cooler water
HII
If ocean temperatures rise, then the risk to
the fish population increases.
DONE W
Answer:
A. There is more dissolved oxygen in colder waters than in warm water.
D. If ocean temperature rise, then the risk to the fish population increases.
Explanation:
Conclusion that can be drawn from the two facts stated above:
*Dissolved oxygen is essential nutrient for fish survival in their aquatic habitat.
*Dissolved oxygen would decrease as the temperature of aquatic habit rises, and vice versa.
*Fishes, therefore, would thrive best in colder waters than warmer waters.
The following are scenarios that can be explained by the facts given and conclusions arrived:
A. There is more dissolved oxygen in colder waters than in warm water (solubility of gases decreases with increase in temperature)
D. If ocean temperature rise, then the risk to the fish population increases (fishes will thrive best in colder waters where dissolved oxygen is readily available).
Answer: the answers are A and D
Explanation:
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