Consumption of vitamin C
What will be an ideal response?
enhances absorption of iron
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EMB agar preferentially selects for the growth of ________ bacteria
A) gram-positive B) gram-negative C) gram-variable D) both gram-positive and gram-negative
The exponential growth rate of a population
under ideal conditions is its
a. carrying capacity. b. logistic growth. c. biotic potential. d. realized niche. e. density dependence
Why is meiosis II needed for gamete (egg and sperm) production?
A) to get unreplicated chromosomes in the gametes B) to generate genetic diversity C) to make the gametes haploid D) All of the above are true.
Which of the following groups is incorrectly described?
a. Cyanobacteria—photosynthetic filaments of cells; many species use the pigment bacteriorhodopsin and inhabit very saline waters b. Proteobacteria—diverse gram-negative bacteria, including pathogens such as Salmonella and Helicobacter pylori and beneficial species such as Rhizobium c. Chlamydias—intracellular parasites, including a species that causes blindness and nongonococcal urethritis d. Spirochetes—helical heterotrophs, including pathogens that cause syphilis and Lyme disease e. Gram-positive bacteria—diverse group that includes actinomycetes, mycoplasmas, and pathogens that cause anthrax, botulism, and tuberculosis