The figure shows a cladogram of direct development versus development of a larval stage. Choose the true statements about the evolution of development in limpets.
_____ Loss of structures in the transition from a larval stage to direct development prohibits evolutionary reversal.
_____ Direct development has evolved multiple times.
_____ Evolution always proceeds parsimoniously.
_____ Possession of a larval stage is the ancestral state in limpets.
_____ Loss of structures in the transition from a larval stage to direct development prohibits evolutionary reversal.
__X__ Direct development has evolved multiple times.
_____ Evolution always proceeds parsimoniously.
__X__ Possession of a larval stage is the ancestral state in limpets.
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Three critical amino acids in the active site of an enzyme are leucine, tryptophan, and alanine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
Of the four types of T cells, only the ____________________ T cells destroy infected body cells
Fill in the blank(s) with correct word
Smaller than diatoms, the ________, which include tiny cyanobacteria, haptophtyes, and coccolithophores, make up the largest biomass in temperate and tropical water
Fill in the blank(s) with correct word
During DNA replication, a replication bubble forms but replication forks do not move. This suggests a mutation in the gene coding for___?
a. initiator proteins b. helicase c. primase d. DNA ligase