The main difference between protonephridia and metanephridia is that:a
protonephridia are involved in osmoregulation, while metanephridia are involved in
excretion.
b. protonephridia consist of blind flame cells, while metanephridia consist of tubules open at
both ends.
c. protonephridia are involved in excretion, while metanephridia are involved in
osmoregulation.
d. protonephridia consist of tubules open at both ends, while metanephridia consist of blind
flame cells.
e. protonephridia are found in annelids and metanephridia are found in flatworms
B
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Bacterial and eukaryotic replication have many similarities. Which of the following is not a true comparison?
A. Both form loops with the lagging strand template to accommodate the antiparallel nature of DNA. B. Both incorporate a sliding clamp mechanism in their replication polymerase. C. Both the primase of bacteria and Pol ? of eukaryotes are responsible for primer synthesis and only incorporate ribonucleotides. D. Eukaryotic replication rates are slower than bacterial rates. E. The Okazaki fragments generated in eukaryotes are shorter than those in bacteria.
As air is inhaled, which of these four structures is the last to be encountered?
A) larynx B) trachea C) bronchiole D) bronchi
Gymnosperms and angiosperms evolved ____ allowing them to live and reproduce in drier habitats than bryophytes and seedless vascular plants.
A. spores B. seeds, spores, and fronds C. vascular tissue, spores, and fronds D. pollen grains and seeds E. fruit and flowers
Which disease has been eliminated through the use of vaccines?
A) tuberculosis B) measles C) rubella D) smallpox E) influenza