Classification of protozoans is based primarily on the type of motility observed in the trophozoite stage. Identification can also be made by
A) Examination of tissue specialization
B) Examination of the cyst
C) Determining a lack of nuclei
D) Determining the level of multicellularity
B) Examination of the cyst
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Acetic acid, chemical formula CH3COOH, a component of vinegar, has multiple production pathways. Which of these equations shows anaerobic fermentation?
a. C2H5OH + O2 ? CH3COOH + H2O b. 2 C4H10 + 5 O2 ? 4 CH3COOH + 2 H2O c. 2 CO2 + 4 H2 ? CH3COOH + 2 H2O d. 2 CH3CHO + O2 ? 2 CH3COOH
Prevention of low back pain is a benefit of increased flexibility.
a. true b. false
Stromatolites are ________
a. mineral features in caves that extend downward from the ceiling b. the earliest type of seed plant c. mat-like remains of bacteria found in extinct hydrothermal vents d. dome-shaped, layered structures formed by photosynthetic bacteria
The chemical reactions that cells use to acquire and use energy to live, grow and reproduce are called ____
a. hydrolysis b. condensation c. phosphorylation d. metabolism e. oxidation