Arthropods cannot grow to a very large size because they lack
A. an endoskeleton.
B. mandibles.
C. a head end.
D. jointed appendages.
Answer: A
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Analysis of a bacterial gene indicates that 24% of the nucleotides in the coding strand contain the base A, 18% contain the base T, 26% contain the base G, and 32% contain the base C. What percent of the nucleotides in the mRNA transcribed from this gene will contain the base U? (Enter your answer as a number only without the percent sign, e.g. enter 5 not5%.)
What will be an ideal response? 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 DNA and RNA? 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?
The invasion of the land by amphibians posed a number of challenges requiring evolutionary innovations. Which one of the following does NOT match a challenge with a corresponding adaptation found in amphibians?
A. The force of gravity was greater without water's buoying effect, selecting for well-muscled legs. B. Additional oxygen was needed for larger muscles, selecting for the partially-divided heart and pulmonary circuit. C. Eggs dry out in a terrestrial environment, selecting for the amniotic egg. D. Gills tend to collapse out of the water, selecting for lungs and cutaneous respiration. 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 amphibian adaptations to land? 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?
True or False: Sickle-cell disease is a recessive disease. This means that two individuals without the disease cannot have a child with the disease. Only parents with the disease can pass it on.
Answer the following statement true (T) or false (F)
If a test cross is performed involving 3 linked genes (A,B and C), the most frequent phenotypes of the offspring are "Abc" and "aBC" and the least common offspring are "abc" and "ABC". What was the genotype in the correct order of the heterozygous individual used in this test cross?
a) Abc/aBC b) BAC/bac c) bcA/BCa d) bAc/BaC