When does the heart begin to develop?
A. week 1
B. week 7
C. week 9
D. week 5
E. week 3
Answer: E
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Which of the following statements about complex multicellular organisms is false?
A. Complex multicellular organisms and simpler multicellular organisms perform a similar range of ecological functions. B. Regulatory genes guide the development of complex multicellular organisms. C. Large differences in the body forms of complex organisms result from different patterns of gene expression. D. When compared to their simpler phylogenetic relatives, complex multicellular organisms show greater species diversity. E. None of these statements about complex multicellular organisms are false.
A testcross is always performed between the individual that is heterozygous for the genes to be mapped and an individual who is ____________
A. Heterozygous for the genes B. Homozygous dominant for the genes C. Homozygous recessive for the genes D. Lacking the genes E. None of the answers are correct
Why does sickle-cell hemoglobin (HbS) migrate slower than normal hemoglobin (HbA) during gel electrophoresis?
What will be an ideal response?
The most immediate potential benefits of introducing genetically modified crops include _____
I) creating crops that can grow on land previously unsuitable for agriculture II) creating crops with better potential for biofuel production III) creating crops with better nutritional attributes IV) increasing crop yield V) decreasing the mutation rate of certain genes A) only II, III, and IV B) only I, II, III, and IV C) only III, IV, and V D) I, II, III, IV, and V