Which one of the following is believed to be the major event that led to the appearance of diverse, complex multicellular organisms on Earth?
A. the increase in atmospheric oxygen
B. the appearance of animals
C. the appearance of plants on land
D. the appearance of bulk transport systems
A
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In mitosis, the chromosomes move to opposite poles during
a. anaphase. b. metaphase. c. prophase. d. telophase
A sailor listening to a shortwave radio heard that the Greenwich mean time (the time at Greenwich, England) was 12:00 p.m. The sailor looked at her watch, which was set according to the time at a nearby location, and found it to be 3:00 p.m. What is the longitude of the sailor?
What will be an ideal response?
You are attempting to synthesize rRNA in a test tube using DNA isolated from mouse cells. In addition to the template DNA, ribonucleotides, and the necessary transcription factors, you should also add ________ to the test tube.
A. RNA polymerase III B. poly-A polymerase C. RNA polymerase II D. RNA polymerase I
Microorganisms possess different means in order to avoid host immune components. Which of the following does not help microbe evade the host immune system?
A. Lysozyme B. Proteases C. Cross reactivity with the host D. Antigenic variation E. Capsule