Viruses are not yet considered an organism because they don't have cell membranes, organelles, and do not carry out vital life functions, although they do have a form of DNA (or similar RNA). A researcher proposing to categorize viruses in the tree of life would need to
A. establish any virus as a control group for experimentation with established domains of organisms.
B. apply his/her proposal to any newly discovered virus, since others aren't currently considered organisms.
C. remember that the scientific method will prevent any changes to the current taxonomy and tree of life.
D. propose that relationship to other organisms as a new hypothesis, and test viruses for shared life characteristics.
E. show the importance of genetic information as a characteristic of life.
D. propose that relationship to other organisms as a new hypothesis, and test viruses for shared life
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Water molecules exhibit cohesive and adhesive properties. What is the chemical bond characteristic that contributes to these and other numerous important properties of water molecules?
A. The covalent bond strengths of water molecules change with pH, temperature, or solute conditions present. B. The covalent bonds that form water molecules transform to ionic bonds in presence of other molecules, temperature changes, or pH. C. Hydrogen bonds form between water molecules, not requiring gain, loss, or sharing of electrons. D. Bonds that form water are of the nonpolar covalent form. E. Ionic bonds between water molecules create increased surface tension.
Vestigial structures are found in humans, and are thought to be useless or rudimentary body parts that had an important function in ancestral species. Give two examples of vestigial structures in humans
What will be an ideal response?
Starch and cellulose _____
A) are polymers of glucose B) are cis-trans isomers of each other C) are used for energy storage in plants D) are structural components of the plant cell wall
Protists include
A. algae and protozoa. B. helminths. C. yeasts and molds. D. All of these choices are correct.