Explanation; -A water molecule can act as an acid or a base even in a sample of pure water. It acts as an acid (donates H+) when it reacts with a stronger base, say sodium hydroxide.
Answer: D) cAMP
Explanation:
In the absence of glucose cell can make use of other sources of carbohydrates such as lactose. In E. Coli and other bacteria utilization of lactose depends on the availability of cAMP. Bacteria accumulate cAMP only when starved. When glucose is exhausted, cAMP is available in plenty.
cAMP is necessary for the gene expression because it binds catabolite repressor protein (CAP) to form CAP-cAMP complex. CAP is a lac repressor the binds to the operator site of the lac operon preventing RNAP From binding to the promoter.
RNA polymerase can bind to the promoter site only when CAP-cAMP formed
Forms solid that are relatively insoluble and nontoxic
Uric acid is product of the metabolic breakdown of the purine nucleotides. It is considered as a normal component of urine. In birds and reptiles the evolved the ability to convert toxic ammonia into uric acid or guanine rather than urea. These organisms are called as uricothelic organism because they have the ability to convert toxic ammnonia to uric acid instead of urea. Uric acid is less toxic than ammonia.
Answer:
Nucleus: The nucleus controls everything which takes place in the cell. It does this as it is the site of the cell's DNA. DNA contains the genetic code which is translated into proteins.
Explanation: