In an adult human stem cell that has a total of 48 chromosomes, how many chromatids are present at prophase of mitosis?
A) 12
B) 24
C) 48
D) 72
E) 96
Answer: E
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Which of the following affect(s) the developmental
pathways that different embryonic cells eventually follow? a. sperm organelles b. sperm RNA c. sperm cytoplasm d. egg cytoplasm e. all of these
The primary function of the large intestine is the
a. storage of nutrients. b. retention of water. c. manufacture of vitamin D. d. digestion of fats. e. removal of water from undigested food.
Which of the following processes is not involved in the hydrologic cycle?
a. chemosynthesis b. transpiration c. precipitation d. evaporation e. condensation
A Case Study. The sputum from two patients was being tested for the presence of M. tuberculosis . Patient 1exhibited clinically obvious TB. Patient 2 did not exhibit clinically obvious TB, but had been in contact with patient 1. The process of testing the sputum samples from patients 1 and 2 included the use of a positive control (test sample/culture). M. tuberculosis was isolated from the sputum samples of both patients. DNA fingerprinting revealed that the isolates from patients 1 and 2 were not identical. Which of the following possibilities most likely occurred?
A) Both patients were infected from a common source B) Laboratory error resulted in one patient specimen being contaminated with another patient specimen C) Poor handling of the test culture allowed cross contamination to patient 2