The cell walls of plants are composed of __________, and the cell walls of fungi are
composed of __________.
a. cellulose; cellulose
b. cellulose; chitin
c. chitin; cellulose
d. chitin; chitin
B
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The rickettsias are divided into groups based loosely on
A) the types of clinical disease they produce. B) their insect vectors. C) taxonomy. D) their biochemical requirements.
During fermentation, the immediate fate of the electrons in NADH is that they:a
are transferred to the electron transport chain. b. are transferred to an organic molecule. c. are transferred to O2. d. are used to make CO2. e. are used to form H2O
Which monomers make up RNA?
a. Nucleotides b. Simple sugars c. Amino acids d. Polymers
All of the following are examples of posttranslational modifications, EXCEPT________
A) Prosthetic groups, such as metals or vitamins, can be added. B) Polypeptides can be degraded and then reassembled to produce entirely different sequenced polypeptides. C) Individual amino acid residues are sometimes modified, such as adding a phosphates, acetyl, or methyl groups can be added. D) Polypeptide chains can be cleaved to produce a shorter and functional polypeptide. E) The N-terminal amino acid is often removed or modified.