What is the underlying, organizing biochemical principle that results in the chemical similarity of virtually all living things? Given this biochemical similarity, how is the structural and functional diversity of living things possible?
What will be an ideal response?
Ans: Living things are composed primarily of macromolecules, polymers of simple compounds of just a few different types. The properties of these polymers are determined by their sequence of monomers and these can be combined in many different ways. Diversity is thus achieved through the nearly limitless variety of sequences that can exist when amino acids are linked to form proteins, nucleotides are linked to form nucleic acids, and monosaccharides are linked to form polysaccharides. Branching in the latter can contribute additional heterogeneity. Each type of organism constructs a unique set of macromolecules from these monomeric units, resulting in the structural and functional diversity among species.
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Which of the following gymnosperms undergoes double fertilization?
A. angiosperms, not gymnosperms, demonstrate double fertilization B. cycads C. gnetophytes D. epiphytes E. ginkgos
A plant sustains pathogen-induced damage to one of its cell walls. A gene-for-gene response soon follows and the tissue surrounding the injury soon dies. Which signaling molecules facilitated this response?
A. Oligosaccharins B. Ethylene C. Gibberellins D. Auxins E. Abscisic acid Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about injury response in plants? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
Skin color is not a good way to distinguish "races" of people because
A) it can be changed by environmental factors. B) it is but one of many traits that vary within and between human populations. C) it is not inherited. D) it changes over a person's lifetime.
Members of which group have formed deposits of chalk, as seen in the white cliffs of Dover?
a. euglenoids b. choanoflagellates c. diplomonads d. foraminiferans e. actinopods