Over the course of evolution, humans have obtained four Hox gene clusters due to duplication. The presence of multiple Hox gene clusters suggests what?
A) Only one of the clusters is silent since it would result in Drosophila development not vertebrate.
B) Only two of the clusters are active and represent the added complexity of vertebrate development.
C) Three of the four clusters are silent and have no effect on development.
D) All four clusters are active and represent the added complexity of vertebrate development.
Answer: D
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Plant and animal development share a number of features, but differ in major ways as well. Which of the following best summarizes the similarities between the two forms of development?
A) Both plants and animals develop from a process of single fertilization. B) Both plants and animals produce specialized tissues through irreversible processes of determination and differentiation. C) Both plants and animals produce gametes via meiosis followed by mitosis of haploid cells. D) Both plant and animal development depend on precise control of gene expression in time and in space.
Why does hair color vary among humans?
A. environment B. genetics C. both D. neither
Dibenzoylhydrazines are a category of molecules that have been used as insecticides. They work by blocking ecdysteroid receptors. How does this kill an insect?
A. The insect can no longer excrete nitrogenous wastes. B. The insect cannot molt. C. The insect can no longer coordinate its movements. D. The chitinous exoskeleton is dissolved. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about ecdysis? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What is the largest source of CO2 released into the atmosphere?
a. bacterial aerobic respiration b. bacterial anaerobic respiration c. fossil fuel combustion d. syntrophic decomposition