The incidence of Down syndrome increases _____.
A) when identical twins or triplets have been conceived
B) both parents are heterozygous for Down syndrome
C) if either of the parents is aneuploid
D) for families with Down syndrome in their pedigree
E) once the mother's age is greater than 35
Answer: E) once the mother's age is greater than 35
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The equation for cellular respiration is: C6H12O6 + 6O2 6CO2 + 6H2O. At what specific point in the cellular respiration process has glucose been broken down completely from a six carbon molecule to 6 molecules of CO2?
A. During the priming reactions in glycolysis B. During the oxidation and ATP formation reactions in glycolysis C. During pyruvate oxidation D. During the condensation reaction in the Krebs cycle E. During the second oxidation in the Krebs cycle 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 cellular respiration and the oxidation of carbon? What other information is related to the question? Choose Answer Do you have all the information needed to determine at which point glucose is completely oxidized to carbon dioxide? 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 term amphipathic refers to those molecules that are
A) hydrophilic. B) hydrophobic. C) charged at both ends but with opposite charges. D) nonpolar at both ends. E) charged at one end and nonpolar at the other.
Which of the boxed subsets of the DNA molecule pictured below consists of a nucleotide?
1.1
2.2
3.3
4.4
5.5
You sample a population of butterflies and find that 56% are heterozygous at a particular locus. What should be the frequency of the recessive allele in this population?
A) 0.08 B) 0.09 C) 0.70 D) Allele frequency cannot be determined from this information.