Answer:
Explanation:
Staining is done for onion cells to visualize the cytoplasm of yellow and white onions because they are not pigmented. The staining of human cheek cells with methylene blue is necessary to stain the nucleus to get clear image of it under microscope because methylene blue binds to negative charge nucleic acids
While for leaf epidermal cells smears, staining is not necessary as they are visible under light microscope without staining and they also have pigmented materials inside them such as chlorophyll chloroplast. The cork cell is a non-living and have a cell wall whose structure is visible under light microscope.
The diffuse expiratory wheezing occurs when a person exhales. The expiratory wheezing can be heard easily, and it occurs because of the mild obstruction in the airway. The respiratory distress occurs when the fluid is filled in the air sac in the lungs. The patient is given beta 2 agonist to control the symptoms, as it causes the dilation of the smooth muscles present in the bronchial passage. But since, the dilation is not helping the patient in controlling the wheezing, following the protocol, she should be given 1;1000 epinephrine SC.
Answer: Sand, silt, and clay
<span>The fertilization of a female egg cell with a male sperm cell is also referred to as Conception (option D)
This process is also known as generative fertilization, conception, syngamy and impregnation. It is the union of gametes to begin the development of a new individual or organism.
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Answer:
Catabolite repression
Explanation:
Catabolite repression is characteristic for prokaryotic organisms such as bacteria and this is the way to control metabolism.
It is called repression, because enzymes that are involved in other sugar's metabolism are inhibited (repressed). The system of catabolite repression have components such as:
- sensory systems-detects ratios of glycolytic intermediates,
- global regulators-control the expression of genes that encode for enzymes.
