What is the main difference between pathogenic bacteria, pathogenic viruses, and viroids
What will be an ideal response?
Only bacteria are living organisms with cells and metabolic machinery. Viruses and viroids are not considered living.
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You are working on a team to characterize a local lake's plankton community. Using a compound microscope, you isolate one specimen from a water sample. It is unicellular and has a specialized feeding groove cut into the cell surface. What cannot be true of this species?
A. It is heterotrophic. B. Its locomotion is facilitated by one or more flagella. C. Glycolysis takes place in a peroxisome. D. It is an osmotroph. E. Its locomotion is facilitated by inter-locking protein strips.
Which of the following is not true of DNA?
A) It is acidic. B) It contains deoxyribose. C) It is found in cell nuclei. D) It contains phosphate. E) It contains amino acids.
Which of the following does (or did) not lay an amniotic (enclosed) egg?
a. birds b. monotreme mammals c. dinosaurs d. frogs e. snakes
In order for a muscle contraction to occur, cross-bridges must form between which one of the following structures within a muscle cell?
A) the plasma membrane and the sarcoplasmic reticulum B) troponin and tropomyosin C) calcium and tropomyosin D) acetylcholine and muscle cell receptors E) actin and myosin