What is the microtubule arrangement of a flagellum or cilium?
a. 9 x1 array
b. 9 + 1 array
c. 9 x 3 structure
d. 9 + 2 arrangement
e. 9 + 3 arrangement
d
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A retrovirus produces an enzyme, called reverse transcriptase, which copies its RNA genome into DNA. This is opposite of the central dogma because
A) a virus is not an organism. B) a virus lacks genetic material. C) the central dogma states that RNA is copied into DNA. D) the central dogma states that DNA is copied into RNA.
Answer the following statements true (T) or false (F)
1. Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics of natural origin. These antibiotics should also be effective in killing Streptomyces. 2. Streptomyces are obligate aerobic soil bacteria that infect many plant roots, causing scabs on their leaves. You would expect to find more Streptomyces near the surface of the soil. 3. Antibiotics usually are not dangerous to use in treating bacterial infections because most antibiotics exploit structures and functions in bacteria that are not present in host cells. 4. Pili are bacterial structures used primarily for motility. 5. Autotrophs must acquire carbon from organic molecules produced from other organisms.
Group I introns, such as those found in Tetrahymena, are unique in that they are excised from mRNA by a protein-driven catalytic reaction
Indicate whether the statement is true or false
DNA polymerase, before any proofreading by repair enzymes, makes one mistake for about every
A) 10,000 to 1 million base pairs. B) 100 million to 10 billion base pairs. C) 1 million to 10 million base pairs. D) 1 to 100 base pairs. E) 100 to 1,000 base pairs.