A wormlike arthropod with a flattened body
and carnivorous eating habits would be
identified as a
a. crustacean.
b. millipede.
c. spider.
d. trilobite.
e. centipede
E
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Sulfate-reducing bacteria (SRB) are very important in the cycling of sulfur within ecosystems because significant amounts of sulfate are present in almost all aquatic and terrestrial habitats, making SRB widespread and active.
Answer the following statement true (T) or false (F)
An initiator tRNA is loaded onto a small ribosomal subunit, which locates the start codon. What happens immediately following this event?
1.A new tRNA moves into the P site and the previous amino acid is transferred from its tRNA to the amino acid the new tRNA is carrying.
2.The anticodon of the initiator tRNA matches up with the mRNA start codon.
3.The new polypeptide chain is released from the ribosome.
4.The large ribosomal subunit joins to the small ribosomal subunit.
All of these statements are true of antigens except __________.
A) they often have a molecular weight of less than 10,000 B) they are often surface molecules on microbes C) they are often proteins or polysaccharides D) they can include nonmicrobial molecules, such as pollen, egg white, and blood cell surface molecules E) they are typically nonself molecules
The use of metals as terminal electron acceptors is/are known as ________ because the metals are not incorporated into biomass.
A. metallo-neutral B. negative metallic addition C. Fenton reactions D. dissimilatory metal reduction