In a compound microscope, the lens that directs light into the eye is the (ocular/condenser/objective) lens
What will be an ideal response?
ocular
Bloom's Taxonomy: Comprehension
Section: Microscopy
Learning Outcome: 4.8
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Deforestation in areas like Madagascar can significantly affect the water cycle. Why is this?
A. Less moisture is transpired into the atmosphere. B. It is more difficult for soil nutrients to leech into streams. C. Weathering of rocks and soil does not release nutrients to bind to water. D. The rate of evapotranspiration increases dramatically. E. Cloud cover will increase.
Some cancers are caused by the overexpression of receptor tyrosine kinases (RTKs). It is known that RTK signaling pathways commonly stimulate cell division. Why would the overexpression of receptor tyrosine kinases lead to cancer development?
A. RTKs are activated by dimerization, caused by ligand binding. If there are too many receptors on the cell surface, it is possible that these receptors dimerize in the absence of ligand binding, thus stimulating cell division at inappropriate times. B. If there are too many RTKs on the cell surface, this will tend to allow cells to adhere to each other. Once they adhere, RTKs from one cell can bind to RTKs from another cell, and they can activate each other leading to activation of downstream signaling pathways in both cells. C. If there are too many RTKs on the cell surface, it is less likely that inhibitors will bind to all of the available RTKs and block their ability to enter the nucleus. As a result, some of the RTKs will be able to enter the nucleus to stimulate transcription. D. If there are too many RTKs on the cell surface, this will promote the inhibition of autophosphorylation. In the absence of autophosphorylation, it is more likely that the RTK downstream signaling pathway will be active.
Athletes who take synthetic steroids can become sterile due to lack of sperm production. This is because of negative feedback on which of the following?
A. the epididymis B. the testes C. the vas deferens D. the prostate E. the hypothalamus
Infection of the respiratory system by ________ may develop into symptoms of a common cold.
A. adenoviruses B. cytomegaloviruses C. papillomaviruses D. polyomaviruses E. parvoviruses