Population increase is most influenced by ____
a. percentage of humans in the pre-reproductive and reproductive age groups
b. number of individuals in the post-reproductive age groups
c. percentage of individuals in the reproductive age groups
d. number of women in the reproductive age groups
e. number of men in any age group
a
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In a conjugation experiment not all of the cells receiving two genes will demonstrate an altered phenotype for both genes. What is the most likely explanation of this phenomenon?
A. One gene is toxic to the cell B. Transferred genes must undergo recombination for genotypic conversion of the recipient cell and there is a possibility that only one gene will be recombined into the recipients chromosome C. The transferred DNA is rapidly degraded by the recipient cell and one gene can be degraded before it is recombined into the host chromosome D. It is not physically possible to recombine more than one gene into a single host genome per conjugation event
Answer the following statements true (T) or false (F)
1. Strains of Staphylococcus aureus known as MRSA are resistant to methicillin, but are susceptible to most other antibacterial agents. 2. Bacteria can develop resistance to a particular antimicrobial agent as a result of a chromosomal mutation or the acquisition of a new gene. 3. A bacterial cell that receives an R-factor becomes multidrug resistant. 4. A “superinfection” is an infection that cannot be cured. 5. Using two different antimicrobial agents to treat a patient's infection is referred to as antagonism if the result that is achieved is much better than that which could have been achieved using only one of the drugs.
What is the process by which undigested food particles are expelled from a protist’s cell?
a. endocytosis b. phagocytosis c. exocytosis d. autocytosis
What type of medium is used to demonstrate oxygen requirements of microbes?
A. Sulfite polymyxin sulfadiazine B. Blood agar C. Thioglycollate D. Sodium chloride