Define "obligate mutualism" in one sentence
What will be an ideal response?
ANS:
a mutualistic relationship in which each partner can only survive and reproduce in the presence of the other
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The specificity of certain rhizobia to infect only particular plants is in part due to the
A) abundance of nutrients present in the soil. B) nifH genes they possess. C) rhizobial lipids that act as signaling molecules. D) season (time of year).
Where are complement proteins synthesized, and what do they do?
a. in the bone marrow, generate new platelets and T-cells b. in the kidneys and plasma, destroy intracellular pathogens c. in macrophages and the liver, destroy extracellular pathogens d. in the spleen and duodenum, generate macrocytes
The fluid mosaic model of membrane structure
1.says that the membrane lipids are floating in protein. 2.says that the membrane proteins are floating in lipid. 3.says the membrane lipids are floating in sugars. 4.says that membrane proteins are floating in DNA. 5.says that there are no sterols in the membrane.
A karyotype of one of your skin cells would reveal a total of 46 chromosomes. How many of these are maternally inherited autosomes?
a) 23 b) 22 c) 46 d) 24 e) 21