Which of the following techniques utilizes an electric current and the fact that DNA molecules are negatively charged?
Hybridization and gene probes
Gel electrophoresis
Replication
Restriction endonucleases
Southern blot
Gel electrophoresis
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During breeding season, female northern elephant seals pick areas of the beach that are relatively protected and remain out of tidal changes. These are some of the "best" places to have their young
These areas are also where they will mate before going back out into the sea to forage for the next eight months. How does this choice reflect sexual selection? A. Pups born on these beaches are more likely to survive to reproduce. B. Females found on these beaches are more likely to have offspring that will survive to reproduce. C. These areas on the beach are more likely to be defended by larger and stronger males. D. These areas on the beach are where closely related females will have their offspring.
Which of the following organisms best describes a catalase-negative, gram-positive coccus that is hemolytic on sheep blood agar, and bacitracin positive?
a. Streptococcus pyogenes b. Streptococcus pneumoniae c. Staphylococcus epidermidis d. Micrococcaceae spp.
Bacteria that require special growth factors and complex nutrients are termed ________.
A. anaerobic B. fastidious C. fermentative D. hemolytic E. aerobic
Which of the following is NOT associated with a
mushroom? a. gill b. dikaryotic hyphae c. nuclear fusion d. meiosis e. single-nuclei hyphae