The most efficient sterilizing conditions in a steam autoclave are ____
A. 121°c at 15 psi for 15 minutes
B. 63 c for 30 minutes
C. 160 c for 2 hours
D. 71.6 c for 15 seconds
E. 100 c for 30 minutes
Answer: A. 121°c at 15 psi for 15 minutes
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Which of the following is NOT typically a main function of stems?
a. mechanical support b. storage of water, nutrients and sugars c. energy capture d. routes for vascular tissues e. new growth
In optimizing foraging, birds often stop feeding in an area and move on, even though there are still some seeds left. What is the best explanation for this observation?
A. Other areas may have food at a lower density. B. They will leave some seeds to create the next generation of plants. C. The density of the food becomes low, so it will take too much energy to find. D. They are more likely to find a mate if they move around. E. They are safer from predators when moving.
Into which group would you place a photosynthetic organism that lacks a nucleus and has a thin peptidoglycan wall surrounded by an outer membrane?
a. Fungi b. Plantae c. Firmicutes (gram-positive bacteria) d. Proteobacteria (gram-negative bacteria) e. Animalia
Microbiologists interested in parasites study multicellular (insects/fungi/worms) as well as single-celled protozoa
What will be an ideal response?