The ability of light microscopes to clearly enlarge
specimens is fundamentally limited by the
a. expertise of the microscopist.
b. quality of the lenses.
c. intensity of the light source.
d. techniques used in the preparation of specimens.
e. shortest wavelength of visible light.
Answer: e
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Over 380,000 species of angiosperms exist on Earth. Which of the following factors contributed to this diversity of flowering plants? Select all correct choices
A. pollination by different insects B. infections by different bacteria C. predation by different herbivores D. infections by different fungi
In DNA replication, a primer is
a. what the original DNA strands are called. b. an enzyme that breaks the hydrogen bonds between base pairs. c. a short piece of nucleic acid that ‘jump starts’ the replication process. d. a molecule that provides the energy for nucleotide attachments. e. a regulatory protein that turns on the gene that starts DNA replication
Membrane proteins:
A. are sometimes covalently attached to lipid moieties. B. are sometimes covalently attached to carbohydrate moieties. C. are composed of the same 20 amino acids found in soluble proteins. D. have all of the properties listed above.
A correct comparison between a benign and a malignant tumor is that ________.
A. benign tumors are not the result of a failure of a cell cycle control system; malignant tumors are B. benign tumors do not metastasize; malignant tumors do C. benign tumors are composed of cancer cells; malignant tumors are not benign tumors D. do not form lumps; malignant tumors do form lumps