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3 years ago

Are the bases on the interior or the exterior of the double helix? Are they randomly arranged or neatly stacked?

2 answers:

5 0

Each helix corresponds to a nucleotide chain, and the two chains are joined throughout their length by adenine-thymine or guanine-cytosine pairs. These base pairs are STACKED one above the other with their planes perpendicular to the axis of the two spirals. This places the hydrophobic base pairs inside the structure and allows the hydrophilic sugar and phosphate groups to contact water on the exterior. The whole helix will just fit inside a cylinder 2000 pm in diameter.

Lemur [1.5K]3 years ago

3 0

the double helix is hydrogen bonded through the bases only so the bases are inside the helix only

as adenine combines with thymine and guanine with cytosine

phosphate are in the exterior of it

sugar groups constitute the double helix.

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The reaction C4H8(g)⟶2C2H4(g) C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol.262 kJ/mol. At 600.0 K,600.0 K, the rate c

crimeas [40]

Answer : The rate constant at 785.0 K is, $1.45\times 10^{-2}s^{-1}$

Explanation :

According to the Arrhenius equation,

$K=A\times e^{\frac{-Ea}{RT}}$

or,

$\log (\frac{K_2}{K_1})=\frac{Ea}{2.303\times R}[\frac{1}{T_1}-\frac{1}{T_2}]$

where,

$K_1$ = rate constant at $600.0K$ = $6.1\times 10^{-8}s^{-1}$

$K_2$ = rate constant at $785.0K$ = ?

$Ea$ = activation energy for the reaction = 262 kJ/mole = 262000 J/mole

R = gas constant = 8.314 J/mole.K

$T_1$ = initial temperature = $600.0K$

$T_2$ = final temperature = $785.0K$

Now put all the given values in this formula, we get:

$\log (\frac{K_2}{6.1\times 10^{-8}s^{-1}})=\frac{262000J/mole}{2.303\times 8.314J/mole.K}[\frac{1}{600.0K}-\frac{1}{785.0K}]$

$K_2=1.45\times 10^{-2}s^{-1}$

Therefore, the rate constant at 785.0 K is, $1.45\times 10^{-2}s^{-1}$

7 0

3 years ago

2 Points Which of the following is a thermal conductor?

yaroslaw [1]

Answer:

Metals are thermal conductor.

8 0

2 years ago

Read 2 more answers

What is the wavelength (in nm) of the least energetic spectral line in the visible series of the H atom?

grin007 [14]

Answer:

Brackett Series (n = 4)

Explanation:

The least energetic line of Hydrogen atom lies in Brackett Series when n = 4 because these are least energetic, have longer wavelengths and lies in Infrared region of spectrum. No traces of Pfund series are formed by H=atoms.

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2 years ago

If a bus traveled 20 miles north on a straight path, and then traveled 20 miles back to the starting point, what would the veloc

AleksAgata [21]

Answer:

The velocity of the bus be is 0 miles/second

Explanation:

Given, a bus travelled a distance of 20 miles north and 20 miles back to the starting point

Hence, total distance = 20 + 20 = 40 miles

Velocity is calculated by the formula:

Velocity = $\frac{\text { Displacement }}{\text { Time }}$

Displacement = $20+(-20)=0 \text { miles }$

Velocity = $\frac{0}{T i m e}=0 \text { miles/second }$

Therefore, the velocity of the bus is 0 miles/second

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2 years ago

Give 2 examples of force pairs that occur when you clean your room?

KATRIN_1 [288]

On eof the forces is inertia. This can happen when you move your furniture to clean under them. When you move an object in a straight line without chanign its composition (e.g moving a chair or a table from one side to the other) you are working with inertia. The secon force is friction. It s present when you clean a surface by rubbing it with a tool like a damp cloth or a mop.

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3 years ago