The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds, whereas neighboring water molecules are held together by ________ bonds
A) hydrogen; polar covalent
B) polar covalent; hydrogen
C) ionic; covalent
D) polar covalent; ionic
Answer: B
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The event that occurs when allolactose levels increase in E. coli is
A. transcription of genes within the lac operon increases. B. transcription of genes within the lac operon decreases. C. transcription of genes within the lac operon does not change. D. E. coli cells replicate rapidly. E. the tryptophan operon becomes more active.
Two individuals are members of the same species if
they a. possess the same number of chromosomes. b. breed at the same time. c. are phenotypically indistinguishable. d. can mate and produce fertile offspring. e. occupy the same habitat.
The induced-fit model
A) was proposed by Hans Buchner. B) distorts the shape of the enzyme and the substrate. C) is also called the lock-and-key model. D) states that enzyme–substrate interactions are rigid. E) proposes that very strong covalent bonds are formed upon substrate binding.
All of the following are routinely done to assure a successful organ transplant and minimize the chance of organ rejection EXCEPT which one?
A) match the ABO blood types of donor and recipient B) match the MHC tissue types of donor and recipient C) irradiate the recipient to knock out his or her immune system prior to the transplant D) give the recipient immunosuppressive drugs to suppress reactions against the transplanted tissue E) give the recipient antibiotics to control any infections