Who of the following was the first to observe and accurately describe microorganisms?
A. van Leeuwenhoek
B. Pasteur
C. Tyndall
D. Lister
Answer: A
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A person able to hear only high-frequency sounds would probably have which of the following structural problems in the ear?
A) The tympanum is damaged because of chronic ear infections. B) The basilar membrane is stiffened along its entire length. C) The ear ossicles are abnormally thickened. D) All of these problems could result in inability to detect low-frequency sound.
The terminal electron acceptor in respiration may be
A. oxygen. B. nitrate. C. NAD. D. an inorganic molecule. E. oxygen, nitrate, AND an inorganic molecule.
Two amino acids are bonded together to form a dipeptide by which type of reaction?
a. condensation b. oxidation reduction c. hydrolysis
d. decomposition e. acid-base
The enzyme terminase is responsible for
a. formation of eukaryotic centromeres. b. packaging a phage genome into its capsid. c. the decondensation of eukaryotic chromatin. d. supercoiling bacterial DNA. e. formation of eukaryotic telomeres.