A mutualism in which two species benefit when living together but can survive when apart is referred to as a(n)
A) obligatory mutualism.
B) trophic mutualism.
C) dispersive mutualism.
D) facultative mutualism.
D
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Which intermediate compound(s) in the citric acid cycle is/are often used for biosynthetic pathways as well as carbon catabolism?
A) ?-ketoglutarate B) oxaloacetate C) succinyl-CoA D) ?-ketoglutarate, oxaloacetate, and succinyl-CoA
ws; ws; ws+; ws+; ws; ws; ws+; ws+
In Neurospora, the white-spore allele (ws) results in white spores rather than the wild-type black spores. Diploid ws / ws+ cells undergo meiosis followed by one round of mitosis to form ordered tetrads. Indicate if the pattern of spores seen in the tetrads are consistent with first-division or second-division segregation. A) first-division segregation pattern B) second-division segregation pattern
What does it mean that the genetic code is “highly conserved”?
a. it is almost universal and has not changed in millions of years b. it resists modification from environmental mutagens c. organisms can only use it a certain number of times d. all organisms and organelles - without exception - have the exact same genetic code e. the products of the genetic code - proteins - are almost the same in all organisms
Are phenotypically similar species always related? Explain why or why not.
What will be an ideal response?