All categories

3 years ago

If a DNA molecule is found to be made of 40% thymine,What percentage guanine would you expect

1 answer:

7 0

2 types of base pairs in DNA:
G-C 
A-T 
Since 40% is T, an equal amount will be A (40%+40%=80%)
20% is left, and this must also be equal, so G is 10% (C is the other 10%)

You might be interested in

Resource depletion, pollution, and habitat lose are all environmental problems cause by what factor

inessss [21]

All problems are caused by a factor in which human beings play an important role in its cause.

8 0

2 years ago

A solution at 25 ∘C has pOH = 10.53. Which of the following statements is or are true? The solution is acidic. The pH of the sol

Lady bird [3.3K]

Answer:

The true statements are:

The solution is acidic

The pH of the solution is 14.00 - 10.53.

$10^{-10.53}=[OH^-]$

Explanation:

The pH of the solution is defined as negative logarithm of hydrogen ion concentration present in the solution .

$pH=-\log[H^+]$

The pH value more 7 means that hydrogen ion concentration is less ,alkaline will be the solution.
The pH value less 7 means that hydrogen ion concentration is more ,acidic will be the solution.
The pH value equal to 7 indicates that the solution is neutral.

The pOH of the solution is defined as negative logarithm of hydroxide ion concentration present in the solution .

$pOH=-\log[OH^-]$

The pOH of the solution = 10.53

$10.53=-\log[OH^-]$

$10^{-10.53}=[OH^-]$

The pH of the solution = ?

$pH+pOH=14$

$pH=14-pOH=14-10.53=3.47$

Here, the pH of the solution is less than 7 which means that solution acidic.

8 0

2 years ago

Nitrogen has a half life of 10 days. If you have a 75 gram sample how much is remaining after 20 days ?

CaHeK987 [17]

There is 9.375 g of nitrogen. This is because when a half-life passes, the mass becomes 2 times less. Since two half-lives have passed, you need to divide by 4.

3 0

2 years ago

A 6.26 g sample of a solid containing ni is dissolved in 20.0 ml water. a 5.00 ml aliquot of this solution is diluted to 100.0 m

saveliy_v [14]

Concentration of Ni in 20mL = 5.28ppm x dilution factor = 5.28 x 100/5 = 105.6 ppm = 105.6 mg/L

molar mass of Ni = 58.6934 g
Molarity of Ni = 100.40 x 10^{-3} / 58.6934 = 1.71 x 10^{-3} M = 1.71 mM.

5 0

3 years ago

Is it appropriate to flush chemicals down the sink

lyudmila [28]

No. That could cause damage to the sink as well as the pipes. It could also create toxic gases that could kill you or others.

6 0

2 years ago