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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The first vertebrates to be able to reproduce on land were the 

A. amphibians. B. insects. C. reptiles. D. mammals.

Biology & Microbiology