Gas exchange in terrestrial insects is accomplished through:A
the use of gills.
B. the use of book lungs.
C. the use of tracheae.
D. diffusion across the epidermal layer.
E. a closed circulatory system.
C
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Although lifestyle choices can't, in general, change our genomes, they can: (Select all correct choices)
A. change the physiological states of our cells, which in turn affects post-translational gene regulation. B. increase the rate at which some genes are transcribed. C. decrease the rate at which some genes are transcribed.
What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci?
A) 3:1 B) 1:2:1 C) 1:1:1:1 D) 9:3:3:1 E) 9:4:2:1
Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. Polio has been virtually eliminated world-wide by which of the following?
a. Antibiotics b. Vaccination c. Mosquito control d. Quarantine e. Improve water quality
What happens first following a neuronal stimulation?
A. Sodium ions enter the cell. B. Sodium ions leave the cell. C. Potassium ions enter the cell. D. Potassium ions leave the cell. E. Potassium ions are involved in positive feedback.