Methane, which is composed of carbon and hydrogen, lacks functional groups and is a gas at room temperature. Upon
replacing one of the hydrogen atoms with a hydroxyl group, methane is converted to methanol, which is a liquid at room
temperature. Explain the reason behind this difference in physical properties. What will be an ideal response?
Concepts to Consider: Polar nature of methanol compared to methane is due to polar
hydroxyl group; polarity of methanol allows formation of hydrogen bonds and increases
cohesiveness of this chemical.
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Small molecules that bind directly to mRNAs and effect transcription or translation are binding to regions of the mRNA known as
A) Shine-Delgarno sequences. B) the operator region. C) riboswitches. D) ribozymes. E) allosteric sites.
A deletion of one base pair that alters the sequences of codons is called a(n)
A. transposon B. substitution mutation C. carcinogen D. oncogene E. frameshift mutation
Which of the following is the longest lasting type of immunity?
a. an adult receiving antiserum/antitoxin injections b. a body receives antibodies to chickenpox across the placenta c. a person survived an infectious disease d. a baby receives antibodies through breastfeeding
Amino acids are delivered in their appropriate order by
A. mRNAs. B. RNA-induced silencing complexes (RISC). C. ribozymes. D. rRNAs. E. tRNAs.