Explain what might occur when purine or pyrimidine bases in nucleotides undergo tautomeric shifts. What will be an ideal response?
ANSWER: Tautomeric shifts, small atomic changes within purine or pyrimidine base molecules, change
the hydrogen bonding properties of bases and allow bonding with noncomplementary bases
that can lead to permanent base changes in sequence following replication. Many DNA
mutations that begin as tautomeric shifts can also be induced by external agents.
You might also like to view...
A human egg can only be fertilized in the ____
a. oviduct b. ovary c. uterus d. cervix e. vagina
Spiders use which mouthparts for subduing prey?
a. mandibles b. pedipalps c. chelicerae d. maxillae e. labial palps
A DUPLICATED CHROMOSOME CONSISTS OF TWO ________
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about photosynthesis is false?
A) Photosynthesis involves many redox reactions similar to the electron transport chain used during cellular respiration. B) Sunlight excites electrons from chlorophyll, which are captured by ATP. C) In the light reactions, electrons eventually wind up on NADPH. D) A waste product of the light reactions is O2. E) During the light reactions, ATP and NADPH are synthesized.