Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following?
A) His reading and discussion of Darwin?s Origin of Species
B) The understanding of particulate inheritance he learned from renowned scientists of his time
C) His discussions of heredity with his colleagues at major universities
D) His reading of the scientific literature current in the field
E) His experiments with the breeding of plants such as peas
Ans: E) His experiments with the breeding of plants such as peas
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Cytokine signaling of phagocytes is an example of:
A. autocrine signaling. B. endocrine signaling. C. paracrine signaling. D. juxtacrine signaling.
Which of the following is a mechanism by which new susceptible individuals enter a population?
A. Birth of new individuals B. Migration of individuals into the population C. Birth of new individuals and migration of individuals into the population D. Enhancement of immune systems through immunization
Which of the following is not a characteristic of all plants?
A. They are autotrophs. B. They are eukaryotes. C. They are multicellular organisms. D. They are heterotrophs. E. They carry out photosynthesis.
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122–130 meters. The tallest known tree on Earth is 112.7 meters. Which of the following most likely limits the height of trees?
A. amount of transpiration in leaves B. ability to take up CO2 C. strength of water cohesion D. amount of energy needed to pump water to the tops of the trees E. amount of photosynthesis in leaves