What feature of genetic mutations can eventually lead to the evolution of new species?
A. Mutations never affect protein structure or function.
B. Mutations always produce beneficial effects.
C. Mutations produce changes in the DNA sequence of a gene.
D. Mutations always produce harmful effects.
E. Mutations are not a mechanism through which biological evolution occurs.
Answer: C
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Researchers tried to explain how vesicular transport occurs in cells by attempting to assemble the transport components. They set up microtubular tracks along which vesicles could be transported, and they added vesicles and ATP
(because they knew the transport process requires energy). Yet, when they put everything together, there was no movement or transport of vesicles. What were they missing? A) an axon B) contractile microfilaments C) endoplasmic reticulum D) motor proteins
Which of the following is not a benefit or advantage of using mass spectrophotometry?
A. Proteins can be sequenced by mass spectrophotometry. B. The mass of a protein can be determined and lead to its identification. C. Changes in mass due to binding of cofactors, bound metal ions, and covalent modifications can be measured. D. If protein is enzyme, sequence information includes three-dimensional structure of active site. E. Fragments of the protein may permit unambiguous association with its gene.
A carcinogen is not a mutagen.
Answer the following statement true (T) or false (F)
Campylobacter is a mesophilic bacteria able to grow at 4 ° C. It is referred to as a _______.
A) mesophile B) psychrotroph C) psychrophile D) thermophile