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Rashid [163]
2 years ago
13

Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as th

e reaction's _____.
A) entropy
B) activation energy
C) equilibrium point
D) free-energy content
Biology
2 answers:
leonid [27]2 years ago
6 0

Answer:

Activation energy.

Explanation:

Chemical reaction may be defined as the reaction in which the substrate is converted into the product. The catalyst are required in some reaction to increase the rate of reaction.

Substrate is converted into the product by overcoming the activation energy. Activation energy may be defined as the minimum amount of energy required for the conversion of the reactant into the products. The substrate must over come thermodynamic factor of the activation energy to convert into the products.

Thus, the correct answer is option (B).

NeX [460]2 years ago
3 0
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c

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On a global scale, energy _____ ecosystems whereas chemical elements _____ ecosystems. see concept 55.1 (page 1237) on a global
Kay [80]
<span>The choices for this question are:
</span>-is biologically magnified in ... are recycled in
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On a global scale, energy flows through ecosystems whereas chemical elements are recycle in ecosystems. So the answer is the third option. 

Energy flows through the ecosystem. Most energy comes from sunlight and it is transformed into chemical energy by autotrophs. When they are consumed by heterotrophs the energy is passed on, until it dissipates as heat.  
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Chemical elements like carbon and nitrogen, on the other hand, are cycled between biotic and abiotic factors in an ecosystem. This is not possible for energy. These chemical elements come from abiotic factors like the air, light and soil. They are incorporated in the biomass of the photosynthetic organisms and are consumed by other organisms. They are changed back into their inorganic form when the organism dies and are broken down by decomposers and the cycle goes on. So they are constantly being recycled. 

In summary, energy needs a continuous source to be able to maintain and sustain the energy flow in the ecosystem. Chemical elements, on the other hand, are just recycled through processes between abiotic factors and biotic factors. </span>
8 0
2 years ago
Which best describes a difference between transcription and DNA replication?
Sedaia [141]

The right answer is A.Transcription uses uracil.

The genes carried by the DNA will be encoded in another form: messenger RNA, during a process called "transcription".

The DNA and RNA molecules are chemically very close, but the second has an extra oxygen (in red on the right of the letters) on the sugars (riboses) that make up its nucleotides (the DNA actually contains deoxyribose). In addition, the thymine (T) of DNA is replaced by uracil (U) in RNA.

8 0
2 years ago
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In this example, we used lotka-volterra equations to model populations of rabbits and wolves. let's modify those equations as fo
Daniel [21]

Answer:

Wolves absence would lead the rabbit population to become stable at 5,000.

Explanation:

Step 1. Concept

If there is a missing variable that should be in the system, set that particular variable to zero and make the necessary conclusion.

Step 2. Given,

dR/dt = 0.08R(1 - 000.2R) - 0.001RW

dW/dt = −0.02W + 0.00002RW

Step 3. Calculation

The transformed equations of populations of rabbit and wolves will be

dR/dt = 0.08R(1 - 000.2R) - 0.001RW

dW/dt = −0.02W + 0.00002RW

Let's check the rabbit population in the absence of wolves(W) to 0

Thus,

Differential equation dR/dt

dR/dt = 0.08R(1 - 000.2R) - 0.001RW

Take W to equal to O

dR/dt = 0.08R(1 - 000.2R) - 0.001R(0)

dR/dt = 0.08R(1 - 000.2R)

When,

dR/dt = 0 we have R = 0 or R = 5,000

This,

R = 5,000 becomes the equilibrium point in the absence of wolves

Then,

0 < R < 5,000, dR/dt > 0

For R, let's estimate a value rise of the rabbit population to 5,000

Then,

R > 5,000, dR/dt < 0

Judging from the value if R, we infer a deduction in the rabbit population by 5,000

Thus,

We can conclude that wolves absence would lead the rabbit population to become stable at 5,000.

7 0
2 years ago
All of the following are functions of the central nervous system except it interprets signals from the external environment it t
jolli1 [7]

Explanation:

It sends message directly to muscles and glands

5 0
2 years ago
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