A. the lac repressor
B. the lac operator
C. the lac promoter
D. the lac locator
The correct answer is A. Lac repressor.
Lac repressor prevents lac gene which are found in the DNA of Escherichia Coli from being expressed for many times.
Lac repressor is termed as DNA which binds proteins. It allows the expression of genes from coding which are made for proteins to be involved in metabolism of lactose which is in bacteria.
When there is no lactose which is available in the cell, then the genes are being repressed. Lactose are being converted to allolactose if they are available.
Answer: G2 phase is where the cell grows again, and prepares for mitosis. This phase allows cells to produce new protein. Although this phase is not a necessary part of the cell cycle.
Explanation:
B) impossible to tell which organisms are closely related on cladogram
C) cladograms are detailed oriented and impossible to show evolutionary relationships
D) there is limited number of ways to classify information some many of cladograms end up looking similar
Ans. (C). cladograms are detailed oriented and impossible to show evolutionary relationships.
Cladistics can be defined as a method to biological classification, by which organisms are categorized in different groups on the basis of most common recent ancestor.
Cladograms only provide relations between different organisms on the basis of physical appearance and do not show genetic constitute of organisms.
Thus, the correct answer is option (C).
Answer:
B. It contains lymphocytes
Explanation:
Lymph is a clear to white fluid made of white blood cells, especially lymphocytes. The cells that attack bacteria in the blood and body tissues. The lymph is a part of the vascular system of our body.
Lymph, part of the lymphatic system, contains lymphocytes and removes waste from the body. However, contrary to option D, it is not filtered in the kidneys.
The statement which is not a characteristic of lymph is: D. Lymph is filtered in kidney. The lymphatic system collects extracellular fluid and returns it to the bloodstream, moving it in a single direction - from the body's tissues to the heart. It's composed of lymph fluid which contains lymphocytes, a type of white blood cell. Lymphocytes play a key role in the immune response, which marks option B as true. Also, the lymphatic system is involved in waste removal, supporting statement C. However, statement D that lymph is filtered in the kidneys is false. Lymph is not filtered by the kidneys, unlike blood that is directed through the kidneys for filtration.
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