Studies of the similarity of the DNA in wasps and bees suggest that the first bees appeared about 130 million years ago, 50 million years before the first known fossil bee, and probably very shortly after the first flowers evolved in the Cretaceous.
<h2>Answer with Explanation </h2>
The DNA stands for deoxyribonucleic acid and mRNA stands for messenger ribonucleic acid. The pyrimidine base of DNA is thymine while the mRNA base is uracil. DNA is present inside the nucleus of the cell while mRNA exists in the cytoplasm after the diffusion process. It is double helix strand while the mRNA is single-stranded structure. DNA contains the information of protein-encoding while the mRNA contains the information of cell enabling the synthesis of protein.
Answer:
Alimentary Canal Organs
This tube begins at the mouth and terminates at the anus. Between those two points, the canal is modified as the pharynx, esophagus, stomach, and small and large intestines to fit the functional needs of the body.
Explanation:
Answer:
The correct answer is: b. lightening of media in the unsealed tube only.
Explanation:
- According to the question, the bacteria can undergo only aerobic respiration, that is it can produce its energy, that is, ATP, or adenosine triphosphate, only in the presence of oxygen.
- The unsealed tube allowed air or oxygen to pass into it which can be used by the bacteria for its respiration. In the process, it will produce acid that will cause the media colour to lighten.
- The sealed tube do not allow any oxygen to pass into it. As the given bacteria can undergo only aerobic respiration but not anaerobic respiration, in absence of oxygen it will not be able to undergo respiration and produce energy and acid. Hence, the media colour will remain unchanged.
- The control tube is used to check the sterility of the media.
