Recently, fossils of a new species, called ________, were discovered in Indonesia. They were smaller than modern humans, and some researchers consider them an offshoot of H. erectus with a small body.
A) Homo habilis
B) Neanderthals
C) Homo afarensis
D) Homo floresiensis
D) Homo floresiensis
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Which of the following is true about base excision repair (BER) in bacteria?
A. BER is used to repair abasic sites created by hydrolysis or by DNA glycosylases. B. BER requires the action of a unique exinuclease activity to cleave 5' of the abasic site. C. At the nick created by the nuclease, Pol III can excise the damaged strand by nick translation. D. BER can be used to excise benzopyrene adducts. E. BER requires binding of the MutS protein to identify the abasic site.
Circular DNA that is apart from the chromosome DNA in some prokaryotes is called a(n)
A. endospore. B. nucleoid. C. ribosome. D. plasmid. E. nucleus.
The central function of X-inactivation is
A) silencing imprinted genes. B) enhancing the expression of genes on the chromosome left active. C) dosage compensation. D) silencing deleterious alleles. E) None of these
Agents that alter protein function may do all but which of the following?
A) Prevent peptide bond formation B) Denature proteins C) Coagulate proteins D) Alter an enzyme's active site E) Prevent an enzyme from interacting with its substrate