During the absolute refractory period, the axon membrane cannot transmit another action potential

____________________ Indicate whether the statement is true or false.


True

Biology & Microbiology

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The genes for mahogany eyes and ebony body are approximately 25 map units apart on chromosome III in Drosophila

Assume that a mahogany-eyed female was mated to an ebony-bodied male and that the resulting F1 phenotypically wild-type females were mated to mahogany, ebony males. Of 1000 offspring, what would be the expected phenotypes, and in what numbers would they be expected?

Biology & Microbiology

Which of the following statements best describes the jawless fishes?

A. Endotherms that have a smooth nonscaly skin. B. Ectotherms that have a smooth nonscaly skin. C. Vertebrates that have scales and are ectothermic. D. Ectotherms that have a bony skeleton.

Biology & Microbiology

Sodium concentration in the urine will be maintained due to the loop of the nephron (loop of Henle) exhibiting

Select one: a. an active release of sodium from the descending limb. b. a passive and active release of sodium from the ascending limb. c. a passive release of sodium from the descending limb. d. the release of water from the ascending limb. e. the active transport of water.

Biology & Microbiology

Genetic exchange between 2 homologous chromosomes is called

A. pleiotropy. B. crossing over. C. synapsis. D. independent assortment. E. allelic exchange.

Biology & Microbiology