Describe how the discovery of the structure of DNA is an example of the fact that science is a process that always builds on previous work. Text Section LO2 Key Concept: Watson and Crick, process of science, DNA structure Level: Application of concepts (maybe some advanced critical thinking)
What will be an ideal response?
Responses should include the following: (a). The fact that DNA is linear, that DNA is a chain of nucleotides, and that there are four types of nucleotides which are identical except for the bases was known from published experiments. (b). Chargraff contributed that the bases A & T and G & C are always found in equal amounts respectively. (c) Franklin contributed good images of DNA using X-ray diffraction that showed the arrangement of the molecules. (d). Watson and Crick came up with the double-helix structure.
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Amy receives a plant from her mother as a housewarming gift. She waters it regularly and keeps the plant on a windowsill that gets regular sunlight. Amy is determined to keep her mother's gift growing well and never moves the plant for fear of "hurting it," but the plant has started growing toward the window. Amy is puzzled as to why her plant is lopsided. What is happening to Amy's plant?
a. The plant is receiving too much water. b. The plant's gravity sensing mechanism is damaged, a process known as gravitropism. c. The plant is searching for support, a process known as thigmotropism. d. The plant is growing toward the light source, a process known as phototropism. e. The plant has weak structural tissue due to a nutrient deficiency of the soil.
____ are tiny pores in the epidermis that facilitate the diffusion of carbon dioxide into leaves or herbaceous stems
a. Stomata b. Guard cells c. Tracheids d. Sclereids e. Trichomes
The oxidation of H2O releases
What will be an ideal response?
The condition that exists when an organism gains or loses one or more chromosomes but not a complete haploid set is known as ________
A) triploidy B) euploidy C) polyploidy D) aneuploidy E) trisomy