How does the production efficiency of ectotherms and endotherms compare?

A. Usually higher in ecotherms than in endotherms.
B. Usually lower in ecotherms than in endotherms.
C. Approximately equal in ectotherms and endotherms.
D. Usually negative in ectothems and positive in endotherms.
E. Usually positive in ectothems and negative in endotherms.


A. Usually higher in ecotherms than in endotherms.

Biology & Microbiology

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What do all deuterostomes have in common?

A) Adults are bilaterally symmetrical. B) Embryos have pharyngeal pouches that may or may not form gill slits. C) All have a spinal column. D) All have specialized head and tail regions. E) The pore (blastopore) formed during gastrulation becomes the anus.

Biology & Microbiology

Which of the following is true of radiometric dating?

A) A mineral that is 10,000 years old would best be dated with radioactive potassium. B) A mineral that is 1 billion years old would best be dated with radioactive carbon. C) Radioactive potassium-to-radon gas ratio can be used to date minerals. D) One can infer the age of a fossil by radiometric dating of the minerals found near the fossil. E) Carbon-14 decays with a half-life of 60,000 years.

Biology & Microbiology

The salivating response to a bell is what Pavlov called an unconditioned response

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

Which of the following is an example of secondary structure in a protein?

A) a particular amino acid sequence B) an alpha helix C) a globular shape D) the joining of two polypeptide chains

Biology & Microbiology