After 20 years, what was the total number of bird species?

a. 14
b. 60
c. 120
d. cannot be determined from this graph


Answer: a. 14

Biology & Microbiology

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Gene function is annotated based on homology between the ORFs of a genome and proteins whose function has been proven experimentally. What "-omic" approach could help us determine the function and structure of proteins encoded by uncharacterized

A) metabolomics B) metagenomics C) transcriptomics D) proteomics

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The Krebs cycle begins when acetyl-CoA combines with _________ to form ____________

A. pyruvate; citrate B. malate; oxaloacetate C. oxaloacetate; malate D. oxaloacetate; citrate E. citrate; cis-aconitate

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Why are flexors and extensors considered antagonistic muscles?

A. Both muscle groups bend a limb at the joint, but each can only contract while the other extends. B. Both muscle groups exert only a pulling force when they contract, but they produce opposing movements of the joint. C. One muscle group exerts a pulling force while the other exerts a pushing force. D. Hypertrophy of one muscle group induces atrophy of the other muscle group.

Biology & Microbiology

Wolbachia can have ALL of the following effects on their insect hosts EXCEPT

a. the killing of males. b. parthenogenesis. c. the sterilization of females. d. feminization.

Biology & Microbiology