Scientists depend on systematic observations to develop systems to classify organisms. The classification system most commonly used by scientists consists of different categories arranged in a hierarchy. Which level represents the most exclusive category or group?
A) species
B) order
C) phylum
D) class
Ans: A) species
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The process of splitting glucose into two molecules of pyruvate without the use of oxygen.
A) Cristae B) Electron transport chain C) Microtubules D) Glycolysis
During this phase of the cell cycle the microtubules of the spindle fiber attach to the kinetochore:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
A particular flower can be purple, blue, red, or white. Two different pure-breeding white plants are crossed and the F1 are then crossed to produce an F2 generation. What might a 9:7 phenotypic ratio in the F2 indicate?
A) reciprocal recessive epistasis B) codominance C) dominant epistasis D) recessive lethality E) additivity
The first vertebrates to be able to reproduce on land were the
A. amphibians. B. insects. C. reptiles. D. mammals.