The correct answer for the question "A student looks at a slice of tissue on an unlabelled microscope slide. the student concludes that the tissue is not from an animal because the cells in t<span>he tissue have" is D. Cell walls. When we compare animal and plant cells, only plant cells have cell walls. Cell walls are formed because of cellulose. </span>
The lids of the Petri dishes were inadvertently left on while being sterilized
Explanation:
The process of eliminating any microbe from a particular object to achieve a sterile aseptic environment is termed as sterilization.
Sterilization mainly aims to either remove, kill or make any microbe inactive by using various means such as irradiation, heat, pressure, etc.
In the given question radiation is used to sterilize the Petri dishes and thus, if sterilization is successful there should not be any contamination.
However, since there is contamination present amongst the bacterial colonies growing on agar plated in the Petri dishes this shows that the sterilization has not been done successfully and a possible reason for this could be that while sterilizing the<em> lids of the Petri dishes were kept on. </em>
Cytotaxonomy refers to the classification of biological materials based upon similarities and differences of cellular structure and number of chromosomes present in the cell afterwards while .:::: chemotaxonomy refers to the classification of biological materials based upon similarities and differences of the ...
Chemotaxonomy is based on the similarities and differences in biochemistry such as a sequence of amino acids in proteins, whereas, cytotaxonomy is the classification based on cellular characteristics such as chromosomes number and behaviour.
