what similarities do you see in the dna bases? warm-up in a single organism, what do you notice about the relative proportions of dna bases? a and t occur in similar proportions. t and g occur in similar proportions. a and c occur in similar proportions. g and c occur in similar proportions. done relative proportions (%) of bases in dna organism a t g c human 30.9 29.4 19.9 19.8 chicken 28.8 29.2 20.5 21.5 grasshopper 29.3 29.3 20.5 20.7 sea urchin 32.8 32.1 17.7 17.3 wheat 27.3 27.1 22.7 22.8 yeast 31.3 32.9 18.7 17.1 e. coli 24.7 23.6 26.0 25.7

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# Brief Explanations:
To determine the correct option, we analyze the relative proportions of DNA bases (A, T, G, C) for each organism:

- For "A and T occur in similar proportions": Check the values of A and T for each organism. For Human: A = 30.9, T = 29.4 (close). Chicken: A = 28.8, T = 29.2 (close). Grasshopper: A = 29.3, T = 29.3 (equal). Sea urchin: A = 32.8, T = 32.1 (close). Wheat: A = 27.3, T = 27.1 (close). Yeast: A = 31.3, T = 32.9 (close). E. coli: A = 24.7, T = 23.6 (close). These values are consistently similar.

- For "T and G occur in similar proportions": For Human, T = 29.4, G = 19.9 (not similar). Chicken: T = 29.2, G = 20.5 (not similar). So this is incorrect.

- For "A and C occur in similar proportions": For Human, A = 30.9, C = 19.8 (not similar). Chicken: A = 28.8, C = 21.5 (not similar). Incorrect.

- For "G and C occur in similar proportions": For Human, G = 19.9, C = 19.8 (close). Chicken: G = 20.5, C = 21.5 (close). Grasshopper: G = 20.5, C = 20.7 (close). Sea urchin: G = 17.7, C = 17.3 (close). Wheat: G = 22.7, C = 22.8 (close). Yeast: G = 18.7, C = 17.1 (close). E. coli: G = 26.0, C = 25.7 (close). These values are also consistently similar. Wait, but the question is about "in a single organism"—wait, no, the options are general. Wait, but the standard DNA base pairing is A-T and G-C, so both A-T and G-C should have similar proportions. But let's recheck the options. Wait, the first option: "A and T occur in similar proportions"—let's check Human: A=30.9, T=29.4 (difference ~1.5). Chicken: A=28.8, T=29.2 (difference ~0.4). Grasshopper: A=29.3, T=29.3 (difference 0). Sea urchin: A=32.8, T=32.1 (difference 0.7). Wheat: A=27.3, T=27.1 (difference 0.2). Yeast: A=31.3, T=32.9 (difference 1.6). E. coli: A=24.7, T=23.6 (difference 1.1). These are all relatively close. Now the fourth option: "G and C occur in similar proportions"—Human: G=19.9, C=19.8 (diff 0.1). Chicken: G=20.5, C=21.5 (diff 1.0). Grasshopper: G=20.5, C=20.7 (diff 0.2). Sea urchin: G=17.7, C=17.3 (diff 0.4). Wheat: G=22.7, C=22.8 (diff 0.1). Yeast: G=18.7, C=17.1 (diff 1.6). E. coli: G=26.0, C=25.7 (diff 0.3). Also close. But wait, the question is "in a single organism"—wait, no, the options are about what is noticed. Wait, maybe I made a mistake. Wait, let's check the original options again. The options are:

A. A and T occur in similar proportions.

B. T and G occur in similar proportions.

C. A and C occur in similar proportions.

D. G and C occur in similar proportions.

Wait, maybe the intended answer is A and D, but since it's a multiple-choice (maybe single correct), but looking at the data, both A-T and G-C have similar proportions (base pairing: A-T, G-C). But let's check the numbers again. For Human: A=30.9, T=29.4 (close); G=19.9, C=19.8 (close). Chicken: A=28.8, T=29.2 (close); G=20.5, C=21.5 (close). Grasshopper: A=29.3, T=29.3 (equal); G=20.5, C=20.7 (close). Sea urchin: A=32.8, T=32.1 (close); G=17.7, C=17.3 (close). Wheat: A=27.3, T=27.1 (close); G=22.7, C=22.8 (close). Yeast: A=31.3, T=32.9 (close); G=18.7, C=17.1 (close). E. coli: A=24.7, T=23.6 (close); G=26.0, C=25.7 (close). So both A (A and T) and D (G and C) have similar proportions. But maybe the question is designed to notice A and T first, or maybe D. Wait, but let's check the options again. Wait, the first option: "A and T occur in similar proportions"—the numbers for A and T are very close across all organisms. For example, Human: 30.9 vs 29.4 (diff 1.5), Chicken: 28.8 vs 29.2 (diff 0.4), Grasshopper: 29.3 vs 29.3 (same), Sea urchin: 32.8 vs 32.1 (diff 0.7), Wheat: 27.3 vs 27.1 (diff 0.2), Yeast: 31.3 vs 32.9 (diff 1.6), E. coli: 24.7 vs 23.6 (diff 1.1). These are all small differences, so A and T are similar. For G and C: Human: 19.9 vs 19.8 (diff 0.1), Chicken: 20.5 vs 21.5 (diff 1.0), Grasshopper: 20.5 vs 20.7 (diff 0.2), Sea urchin: 17.7 vs 17.3 (diff 0.4), Wheat: 22.7 vs 22.8 (diff 0.1), Yeast: 18.7 vs 17.1 (diff 1.6), E. coli: 26.0 vs 25.7 (diff 0.3). Also small. But maybe the question is looking for A and T, or G and C. Wait, maybe the correct answer is A and D, but since it's a multiple-choice (maybe checkboxes), but the original problem has checkboxes. Wait, the user's problem shows checkboxes, so maybe both A and D are correct. But let's re-express. Wait, the question is "what do you notice about the relative proportions of DNA bases?" The key is that in DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C), so their proportions should be similar (Chargaff's rules). So both A (A and T) and D (G and C) are correct. But let's check the data again. For each organism, A and T are close, G and C are close. So the correct options are A. A and T occur in similar proportions, and D. G and C occur in similar proportions. But maybe the question is designed to have these two as correct.
# Answer:
A. A and T occur in similar proportions, D. G and C occur in similar proportions

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