The ends of chromosomes are called ________.
A. caps
B. telomeres
C. centromeres
D. DNA termini
Answer: B
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Thomas Bell and his colleagues studied bacterial species richness in isolated European beech treehole basins
("islands"). Their data showed that ______.
a. island size affects beech tree populations b. the number of bacterial species decreases with treehole volume c. the number of bacterial species increases with treehole volume d. large beech trees support higher bacteria populations than small beech trees e. the species-area effects on bacterial species differs from species-area effects on animal and plant populations on true islands
What causes a stomach ulcer?
A) Lack of a key nutrient B) Consuming too many calories C) Chronic consumption of spicy food D) A bacterial infection
An octapeptide composed of four repeating glycylalanyl units has:
A) one free amino group on an alanyl residue. B) one free amino group on an alanyl residue and one free carboxyl group on a glycyl residue. C) one free amino group on a glycyl residue and one free carboxyl group on an alanyl residue. D) two free amino and two free carboxyl groups. E) two free carboxyl groups, both on glycyl residues
Cnidaria and flatworms exchange gases and remove wastes by way of their
A. open circulatory systems. B. moist skin surfaces. C. closed circulatory systems. D. respiratory and excretory systems. E. gastrovascular cavities.