Answer:
Option B, Sleep cycles in which REM sleep alternates with slow-wave NREM sleep.
Explanation:
The pattern of sleep is cyclical consisting of rapid eye movement (REM) pattern phase repeating itself after every ninety minutes. Within the gap of two REM phase, intermittent non rapid eye movement (NREM) pattern occurs. This type of sleep pattern is very usual in all mammals be it human or animals. During the REM phase of sleep, the brain is stimulated for its development and also protein production increases.
While in NREM phase, some involuntary body movements such as eye twitching, body straightening etc occur.
Hence, option B is correct
Cell walls made of cellulose are only found around plant cells and a few other organisms. Cellulose is a specialized sugar that is classified as a structural carbohydrate and not used for energy.
Answer:it is a characteristic of DNA
Explanation:
Deoxyribonucleic acid(DNA) is made 5 carbon deoxyribose sugar, phosphate group,Nitrogenous base which include purine and pyrimidine. Purine base compose of Adenine and guanine while pyrimidine base compose of Cytosine and thymine.
In Ribonucleic acid (RNA) we have 5 carbon ribose sugar, phosphate group and nitrogenous bases which are purine and pyrimidine. Purine consist of Adenine and guanine while pyrimidine compose of Cytosine and Uracil where thymine in DNA is replaced by Uracil in RNA. This makes Thymine a components of DNA not RNA.
The pH of water is 7 because it contains an equal amount of H+ and OH-ions.