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stiks02 [169]
3 years ago
9

A classmate has asked you to help them determine the concentration of DNA in their solution. Their A260 reading was 1.69. What w

as the concentration of their DNA
Biology
1 answer:
Gnesinka [82]3 years ago
7 0

Answer:

Acid , phenol or protein

Explanation:

The ratio of absorbance at 260 and 280nm is what is usually used to assess the purity which a DNA or RNA posses. A ratio of 1.8 is generally accepted as being pure for a DNA sample and a ratio of 2.0 is generally accepted also as being pure for RNA. when the ratio is significantly lower in each case, it indicates that there is presence of protein, phenol or other contaminants.

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The enzyme telomerase solves the problem of replication at the ends of linear chromosomes by which method?
adell [148]
<h2>Answer </h2>

The method is by adding various small DNA chains such as TTAGGG, that develop a hairpin turn.

<u>Explanation </u>

The method is by adding various small DNA chains such as TTAGGG, that develop a hairpin turn. Telomerase is an RNA dependent DNA polymerase means an enzyme that can make DNA using RNA as a template. The ends of linear chromosomes called telomeres that protect genes from getting deleted as cells continue to divide. The telomerase enzyme attaches to the end of chromosome complementary bases to RNA template are added on 3 ends of the DNA strand.

3 0
3 years ago
Daniel and nellie are hoping to maximize nellie's chances of becoming pregnant. when should they have intercourse?
kenny6666 [7]
Between the 6th and 21st days of the menstrual cycle

3 0
3 years ago
25. A student measures the distance from a bridge
kkurt [141]

Answer:

(4) As time increased, distance remained

the same

Explanation:

The graph shows that the student measures equal distance everyday from the bridge to the rock for 7 days.

Everyday has an equal distance measured by the student all through the week.

Let's say the point on the vertical axis which represents distance measured is about 1.5 meters. It means that, for day 1, he measures 1.5 meters, day 2, he measured 1.5 meters, by day 3 another 1.5 meters. Same he does for 7 days. For the first 3 days, he would have measured 1.5 m × 3 = 4.5 meters.

This means that, as time (days) increased, distance measured each day remains the same.

6 0
3 years ago
what would you if cell membrane became impermeable instead of selectively permeable could cell remain alive
natali 33 [55]
If a cell membrane became impermeable, instead of selectively permeable, the cell would not remain alive, though certain organisms would be able to stay alive longer than others. This is because the cell membrane allows essential molecules and substances such as oxygen into the cell, while allowing harmful substances, like waste, out of the cell.

:)
4 0
3 years ago
A mutation in the operator region of the trp operon can prevent the trp repressor from binding to this operator. When these muta
Brilliant_brown [7]

Answer:

d. Tryptophan would bind to the repressor

Explanation:

However,the repressor would not be able to bind to the operator and switch off transcription.The cell would still be making tryptophan even though it is being supplied by the medium in which it is growing.This is a waste of energy.

4 0
3 years ago
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