Which of the following is a process by which an initial set of genes turns on a second set of regulatory genes, which eventually turns on a third set of genes?
A) the sonic hedgehog sequence
B) the genetic cascade
C) developmental chain reaction
D) somite production
E) gastrulation
Answer: B
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What is the most fundamental difference between the innate immune system and acquired immune system?
A. the way in which pathogens are recognized B. the way in which pathogens are destroyed C. the types of cells that participate in each response D. the speed
DNA sequence evidence suggests that plants, fungi, and animals arose from different lineages of unicellular protists. This suggests which of the following?
A. Protists arose before the other three kingdoms. B. Early ancestors to plants, fungi, and animals could interbreed. C. Multicellular organisms only arose once in evolutionary history. D. The animal, plant, and fungal kingdoms contain some single-celled organisms. E. All unicellular organisms are now extinct.
What does a scientist do after making observations?
A) Formulate a hypothesis B) Conduct an experiment C) Think of questions D) Draw a conclusion
All of the following are true statements about life zones EXCEPT:
a. Life zones are very broad geographical regions with similar physical characteristics. b. Terrestrial life zones are typically described by the dominant type of vegetation. c. Animals typically moved readily between different life zones in a geographical area. d. Each continent is made up of many different life zones