How do cytotoxic T cells kill infected cells?
What will be an ideal response?
The cytotoxic T cell binds the infected cell and releases protein-digesting enzymes and perforins. Perforins form channels in the infected cell's membrane. The protein-digesting enzymes then enter the infected cell, causing cell death.
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Human birth rate peaked in the 1980s and has been slowly declining ever since. How is this expected to affect our population size over the next several decades?
A. The human population size will level off. B. The human population size will continue to increase at the same rate it has for the past 100 years. C. The human population size will begin to decline. D. The human population size will continue to increase, but not as fast as before.
Which unicellular protists have silica shells consisting of top and bottom halves that fit together like pillboxes?
A) Apicomplexans B) Amoebas C) Diatoms D) Euglenids E) Slime molds
After estrogen binds to receptors, these estrogen receptors gain ________ activity.
A. phospholipase B. GTP binding C. phosphatase D. protein kinase E. transcription factor
Bacterial strain A contains a plasmid. Bacterial strain B does not. When the bacteria are incubated together in a broth culture strain B cells containing the plasmid can be isolated. Devise an experiment to determine what type of gene transfer process is
involved. What will be an ideal response?