The nitrogenous waste in mollusks is removed by
A. flame cells.
B. Malpighian tubules.
C. flagella.
D. nephridia.
E. incurrent siphon.
Answer: D
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Which of the following statements most accurately describes the inference that can be made regarding the possible functional significance of FoxP2 in the evolution of human language?
A. FoxP2 is a highly conserved transcription fact that is a "language gene". Changes in the function of this gene in the human lineage were the key event that allowed language to evolve. B. FoxP2 is a developmental gene with pleiotropic effects. Because this gene is highly conserved among a group organisms that are capable of acoustic communication it must be involved in the evolution of human language. C. FoxP2 is a highly conserved transcription factor. Because songbirds whose FoxP2 has been knocked out are less capable of learning new songs, this gene is likely involved in the evolution of human language. D. FoxP2 is a developmental gene that affects acoustic communication in a range of animal species. Because the human gene shows an elevated rate of non-synonymous to synonymous mutations in the human lineage, changes to the function of this gene in the humans may have contributed to the evolution of language.
Which of the following is not coded for by the retroviral genome?
A. viral coat proteins B. tRNA C. reverse transcriptase D. integrase E. envelope protein
Bites by little children typically cause few problems
Indicate whether this statement is TRUE or FALSE.
Treponema pallidum ________.
A. lacks numerous biosynthetic pathways and thus has numerous nutritional requirements B. requires protein factors found in blood C. is missing several important genes essential for DNA replication D. is missing the pathway for peptidoglycan synthesis