In order to add a single amino acid to a growing polypeptide chain, a grand total of ________ molecules or ATP or GTP are utilized.
A. three
B. four
C. six
D. two
Answer: A
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Identification of the causative microbe for a diarrheal infection often requires a stool culture. The best medium for this purpose is
A. a medium containing mammalian blood to provide extra growth factors. B. a liquid medium, as the diarrhea conditions are more liquid than solid. C. a medium containing bile as a selective agent. D. a medium containing a broad-spectrum antibiotic as a selective agent. E. a general purpose medium that supports the growth of the diverse gut microbiota.
Put the following steps of DNA replication in chronological order.
1. Single-stranded binding proteins attach to DNA strands. 2. Hydrogen bonds between base pairs of antiparallel strands are broken. 3. Primase binds to the site of origin. 4. DNA polymerase binds to the template strand. 5. An RNA primer is created. A. 2, 1, 3, 5, 4 B. 3, 1, 5, 4, 2 C. 1, 5, 3, 4, 2 D. 3, 5, 1, 2, 4
You are asked to give a classroom demonstration of DNA supercoiling. To do so, you take two different colored pieces of rubber tubing, twist them very tightly and excessively around each other and join the ends of the tubing appropriately. Next, you relieve the supercoiling by breaking one strand and unwinding it. In this demonstration, the breaking and unwinding to relieve the supercoiling simulates the action of
A. polymerases. B. exonucleases. C. primases. D. topoisomerases. E. ligases.
Both respiration and photosynthesis require the use of an electron transport chain
Indicate whether the statement is true or false