Nephridia are
a. circulatory organs.
b. respiratory organs.
c. excretory organs.
d. endocrine organs.
e. part of the nervous system
C
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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.
What factors stimulate uterine contractions and birth?
A. FSH and prostaglandins B. LH and prostaglandins C. oxytocin and prostaglandins D. prolactin and prostaglandins E. hCG and prostaglandins
Receptors that detect tissue damage are classified as ____
a. photoreceptors b. chemoreceptors c. mechanoreceptors d. thermoreceptors e. nociceptors
Components of the central nervous system include (check all that apply)
A. projection of neuron from spine to muscle cell. B. brain. C. nerve cord. D. spinal cord.