Imagine that a cell contains a genetic mutation in the gene encoding the primase enzyme, rendering it unable to
synthesize RNA strands. Assuming that all of the other enzymes directly involved in DNA replication are still functional
in these cells, how much of the DNA replication process would you expect to see in these cells?
a. The leading strand would be synthesized, but not the lagging strand.
b. No part of the DNA replication process could occur.
c. The DNA helix would be unwound by helicase, but no new strands will be produced.
d. Both the leading and lagging strand would be synthesized, but pieces of discontinuous strands would not be
joined together.
e. DNA replication would still proceed completely since RNA strands are not part of the final product of DNA
replication.
ANSWER: c
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Olfactory receptor cells ________.
Fill in the blank(s) with the appropriate word(s).
How do protein kinases generally activate their target proteins?
A) The process of phosphorylation causes the target proteins to change conformation. B) The kinases bind to target proteins directly, forming a complex that activates the proteins and lets them change conformation. C) Kinase concentrations vary during the cell cycle, so that proteins are activated only when kinase levels are high. D) Kinases bind to target proteins and inactivate them, so kinase levels must drop for target protein activation. E) The process of dephosphorylation causes the target proteins to change conformation.
A species-specific ratio of ________ produced in the apical meristem and ________ produced in the root tips maintains a balance between shoot and root growth
A) cytokinins; auxins B) gibberellins; abscisic acid C) auxins; cytokinins D) abscisic acid; ethylene E) abscisic acid; gibberellins
Which of the following statements regarding vitamins is true?
A) They are simple inorganic compounds. B) They must be ingested in large quantities. C) They can serve as coenzymes or parts of coenzymes. D) They are major sources of dietary calories.