Why can bacteria undergo rapid evolutionary change?
a. Bacteria pass through numerous bottlenecks.
b. Bacteria mutate at high rates.
c. Bacterial populations are large and can reproduce quickly.
d. Bacteria experience intense selective pressure.
Answer: C
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A cell contains 10% solute, while the external environment contains 20% solute. What kind of solution is this cell sitting in?
a. hypotonic b. isotonic c. hypertonic d. osmotonic
Four of the five statements listed below apply to the types of ecological pyramids. Which one is FALSE?
a. A pyramid of numbers has the greatest number of organisms at the top. b. A pyramid of energy shows that energy increases as one goes toward the apex of the pyramid. c. A pyramid of biomass cannot be inverted. d. The base of all ecological pyramids is equal in size to the top. e. The pyramid of biomass show actual biomass reduction from one trophic level to the next.
If nondisjunction occurs in meiosis II during gametogenesis, what will be the result at the completion of meiosis?
A) All the gametes will be diploid. B) Two gametes will be n + 1, and two will be n - 1. C) One gamete will be n + 1, one will be n - 1, and two will be n. D) There will be three extra gametes. E) Two of the four gametes will be haploid, and two will be diploid
Which phyla are classified in the Deuterostomia?
A. Annelida and Mollusca B. Mollusca and Chordata C. Echinodermata and Chordata D. Chordata and Vertebrata E. Arthropoda and Vertebrata