Which of the following is not a characteristic of amphibians?

A. They are ectothermic.
B. They do not have an amnion.
C. They have a three-chambered heart.
D. They have vertebrae.
E. They have a cartilaginous skeleton.


E. They have a cartilaginous skeleton.

Biology & Microbiology

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Many patients who have a certain blood clotting disorder in which the blood clots too readily have a mutation in the promoter of a gene. This mutation most likely

A) deletes a gene for a clotting factor. B) blocks transcription of a clotting factor. C) increases susceptibility to a specific viral infection. D) increases the transcription rate of a particular clotting factor gene.

Biology & Microbiology

CAM plants typically live in hot, dry deserts

Indicate whether the statement is true or false

Biology & Microbiology

Mycorrhizae are associations between:a

coral animals and dinoflagellates. b. two types of insects. c. fungi and plant roots. d. wasps and orchids. e. epiphytes and rainforest trees.

Biology & Microbiology

Omnivore teeth are characterized by which of the following statements?

A. Four types of teeth are equally developed. B. Reduced canine teeth C. Premolars with narrow, bladelike surface D. Reduced number of molars E. Sharp, pointy incisor teeth

Biology & Microbiology