Which of these correctly describes the distribution of ions on either side of an axon when it is not conducting a nerve impulse?
A. more sodium ions (Na+) outside and more potassium ions (K+) inside
B. K+ outside and Na+ inside
C. charged protein inside
D. both and d are correct
Answer: A. more sodium ions (Na+) outside and more potassium ions (K+) inside
You might also like to view...
A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein is added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp. The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?
A. Competence in bacteria A is constitutively expressed. B. Competence in bacteria B is dependent on the phase of growth. C. Both bacteria A and bacteria B cells are competent. D. Neither bacteria A nor bacteria B cells are competent.
Vertical evolution arises from Select all that apply.
_____ genetic mutations. _____ sexual reproduction. _____ bacterial conjugation. _____ gene duplication. _____ interspecies exchange of genes.
What avenues of research would probably not help determine if asexual organisms form species?
a. determine if a cluster of bacteria constitutes a species b. explore various niches in which different populations reside c. look into previously undiscovered types of bacteria d. genomic research e. hybridizing polyploid plants
Which of the following does not function as a site of active cell division?
A. Shoot apical meristem B. Root apical meristem C. Parenchyma meristem D. Cork cambium