Download Answers to Biological Inquiry Questions – Brooker et al ARIS site

Answers to Biological Inquiry Questions – Brooker et al ARIS site
Chapter 28
Figure 28.3
BIOLOGICAL INQUIRY QUESTION: How could a microbiologist determine whether unknown
filaments growing in diseased plant leaves were fungus-like protists or true fungi?
ANSWER: In order to determine whether an unknown filament growing within plant leaves is a
fungus-like protist or a true fungus, a microbiologist might extract DNA, then amplify DNA that
encodes ribosomal RNA, determine the sequence, and compare to database sequences for protists
and true fungi.
Figure 28.6
BIOLOGICAL INQUIRY QUESTION: What happens to ingested particles after they enter feeding
cells?
ANSWER: After particles are ingested via feeding grooves, particles are enclosed by membrane
vesicles and then digested by enzymes.
Figure 28.11
BIOLOGICAL INQUIRY QUESTION: Why do parts of the cell wall of Ornithocercus resemble sails?
ANSWER: The sail-like portions of the dinoflagellate cell wall help keep the cells afloat.
Figure 28.12
BIOLOGICAL INQUIRY QUESTION: How do the flagellar hairs aid cell motion?
ANSWER: Flagellar hairs function like oars, helping to pull cells through the water.
Figure 28.15
BIOLOGICAL INQUIRY QUESTION: How do choanoflagellates obtain food?
ANSWER: Choanoflagellates generate water currents by beating their flagellum. The water currents
are filtered through the collar of tentacles, which collects food particles such as bacterial cells. Prey
cells are ingested by phagotrophy and digested within the cell.