Which structures are characterized by its smallest branches ending with a large flame cell?
a. hepatic tubules
b. nephrons
c. Malpighian tubules
d. protonephridia
Ans: d. protonephridia
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How could an embryonic stem cell be used to repair a severed spine?
A. Embryonic stem cells secrete proteins that repair all other cell types, including nerve cells. B. Embryonic stem cells are primarily involved with neural growth and development. C. Embryonic stem cells can grow into any other cell type, including a nerve cell. D. Embryonic stem cells can cause any other cell type to multiply.
Which of the following is NOT photoautotrophic?
a. Cyanobacteria b. Green sulfur bacteria c. purple sulfur bacteria d. purple non-sulfur bacteria e. Cyanobacteria and purple sulfur bacteria
What brain-related injury has gotten recent attention from the professional sporting world?
a. fractured skulls b. concussion c. spinal cord injuries d. Alzheimer's disease e. Parkinson's disease
Semen components are produced by
a. the prostate gland. b. the seminal vesicles. c. the testes. d. the urinary bladder. e. all except "the urinary bladder."