How do fossils support the theory of common descent?
A) They are a record of some intermediate types of organisms that document the process of evolution.
B) They can be easily and precisely dated by comparing the rock layers where they are found.
C) They are found equally all over the world, so they explain all our questions about biogeography.
D) They contain complete DNA genomes, so they can be compared to modern organisms.
A
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Restriction endonucleases are produced by
A. fungi. B. protozoa. C. plants. D. bacteria. E. All of the choices are correct.
Historically, fishermen kept larger adult fish and left smaller adult fish. Over time, the average size of the fish would
A. increase by genetic drift. B. decrease by genetic drift. C. remain unchanged. D. decrease by natural selection. E. increase by natural selection.
Which of the following is the correct
difference between rough endoplasmic reticula and smooth ER?
a. rough ER is an extension of the nuclear envelope; smooth ER is not b. smooth ER has a double bilayer membrane; rough ER does not c. smooth ER consists of flattened sacs and tubes; rough ER does not d. rough ER has a surface studded with ribosomes; smooth ER does not e. smooth ER synthesizes proteins: rough ER does not
How are L-forms different than Mycoplasma bacteria?
A) L-forms have never had a cell wall. B) L-forms live inside plant cells. C) L-forms are susceptible to antibiotics that target the cell wall. D) L-forms are resistant to certain environmental stresses like boiling and autoclaving. E) L-forms live inside animal cells.