The plastids that give flowers and fruits their distinctive colors are
A) chloroplasts.
B) elaioplasts.
C) amyloplasts.
D) chromoplasts.
E) proteinoplasts.
Answer: D
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Which of the following enzymes is responsible
for the wide range of diversity found in RNA viruses?
a. DNA polymerase b. RNA polymerase c. reverse transcriptase d. protease e. ligase
DNA replaced RNA as the main information
molecule probably because a. DNA contains thymine and RNA does not. b. DNA is double stranded and breaks less easily. c. DNA can store more protein-building instructions in less space. d. RNA is highly unstable. e. two of these are correct
All of the following are key elements of evolution EXCEPT which one?
A) Organisms have changed from their ancestors over time. B) Change has been accomplished with a purpose and a plan. C) Change is unpredictable and determined by natural processes. D) Change depends on alterations in the DNA.
What is the purpose of the waxy cuticle in plants?
a. It prevents desiccation. b. It prevents transpiration. c. It prevents diffusion of gases. d. It prevents the transport of nutrients. e. It prevents the internal transport of water.