Answer:
B. Nucleic acids absorb UV light maximally at wavelengths of 254 to 260. Proteins absorb UV maximally at 200 nm. Using this phenomenon, one can to determine the presence and concentration of nucleic acids in a mixture.
Explanation:
The concentration of a solution of nucleic acid can be determined by measuring the absorbance at 260 nm, using a spectrophotometer. An A260 of 1.0 is equivalent to a concentration of 50 μg/mL for double-stranded DNA, or 40 μg/mL for single-stranded DNA or RNA. If the A280 is also determined, the A260/A280 ratio indicates if there are contaminants present, such as residual phenol or protein. <u>The A260/A280 ratio should be around 1.8 for pure DNA and 2.0 for pure RNA preparations.</u>
Answer:
Essay on types of digestion
Explanation:
Digestion refers to the breakdown of large food molecules into small food molecules so that can be absorbed by the blood. There are two types of digestion i. e. mechanical digestion and chemical digestion. in mechanical digestion, the food is broken down into smaller parts physically with the help of teeth while on the other hand, in chemical digestion, food is broken down into small particles with the help of chemicals such as acids and enzymes. This chemical digestion is carried out in the stomach where different types of chemicals are present.
1. blood vessels dilate
2. there is an aggregation of platelets (blood clots)
3. fibroblasts make collagen (healing agent under the skin)
4. neutrophilis consume the bacteria
5. macrophages remove the damaged tissue
6. the wound closes
hope that is right good luck
QuestionQuestionQuesQuestionnonumberno number.
1 answer -True
2 answer-False
