How are steroid hormone receptors and cell-surface receptors similar?
A. When bound to their ligand, both types
enter the nucleus to activate transcription.
B. Both types cause GDP to be exchanged
for GTP in a G protein.
C. Both types undergo a conformational
change when they bind to their ligand.
D. When activated the signals of both types
are transduced across the plasma
membrane.
C
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Excess sugars stored by high-latitude algae can
a. serve as accessory to cellulose. b. serve as antifreeze in winter. c. keep predators away. d. confuse predators with different colors. e. protect the algae from wave damage.
Treatment of fungal infections is more difficult than treatment of bacterial infections because the greater metabolic similarity between the fungi and their hosts limits the ability of a drug to have a selective toxicity.
Answer the following statement true (T) or false (F)
A gene created from the fusion of two gene fragments is considered a
A. regulatory gene. B. tumor-suppressor gene. C. chimeric gene. D. proto-oncogene. E. structural gene.
Which pathogen is LEAST commonly associated with food poisoning?
a. Clostridium botulinum b. Clostridium perfringens c. Escherichia coli d. Staphylococcus aureus