A group of ten tomato plants are germinated and maintained in a large tray with no drainage. After several weeks they all begin to wilt and die despite repeated watering and fertilization. The most likely cause of this die-off is _____
A) competition for resources
B) a lack of oxygen for the roots
C) organic nutrient depletion
D) no room left for root growth
B
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Which of the following statements about Pneumocystis jiroveci is true?
A. The organism and the disease remains localized in the lungs even in fatal cases. B. The disease it causes occurs almost exclusively in immunocompromised hosts. C. It causes the alveoli to fill with a frothy exudate. D. All of the choices are correct.
The origin of mitochondria is attributed to a(n) ________
a. aerobic bacterium entering an aerobic eukaryotic cell b. chloroplast entering a bacterium c. aerobic bacterium entering an anaerobic eukaryotic cell d. anaerobic bacterium entering an anaerobic eukaryotic cell e. anaerobic bacterium entering an aerobic eukaryotic cell
In the DNA double helix, the two strands are joined by _____.
A) phosphate bonds B) hydrogen bonds C) covalent bonds D) deoxyribose
A Gram stain distinguishes bacteria based on a difference in their __________.
a. cell walls b. flagella c. fimbriae d. plasmids e. capsules