Answer: False
Explanation: there are a Varity of viruses that affect plant life such as the mosaic virus which causes discolored splotches on the plants leaves.
In relation to the situation described in the question, I would not agree with the student's assessment that the new cell line would be fine for the experiment given that the main goal of the experiment was to make conclusions about testosterone-<em><u>specific </u></em>pathways.
The student in question wishes to create an experiment to test the effect of testosterone in a specific signal transduction pathway. The initial experiment designed by the student was correct as it takes the cell line as a control variable to measure the pathway effects.
However, Once the student changed the cell line, he affected the <em><u>accuracy </u></em>of the experiment since hormones such as testosterone behave differently in the absence of specific pathways and will be more affected by competetive hormones amongst those new pathways.
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Answer:
The correct answer is- size and hydrophobicity
Explanation:
The cell membrane is a semi-permeable membrane which means it only allows the transport of selective molecules across it. Some molecules can cross the membrane freely but some require transporters.
The passage of molecules is highly dependent on the size and hydrophobicity of the molecule. The molecule which is smaller in size, hydrophobic and neutral can freely diffuse through the plasma membrane.
The molecule which is hydrophilic, large and charged requires transporter protein to be transported. Therefore the correct answer is size and hydrophobicity.
<u>Answer</u>: B. narwhal
The narwhal is the whale species that has a long external tusk protruding from a canine tooth. However, the function of this strange structure has remain a mystery for a long time, recent drone footage may have found the answer.
Although it is believed that this 3 meter tooth may play an important role in mating, another function for it may be in hunting fish. In the footage, the individual uses it to hit the fish and thus stun it.
Furthermore, another function may also be echolocation, through which marine species, especially dolphins, use sound waves to "see" underwater.
