Immediately after fertilization of a Drosophila egg, the zygote nucleus undergoes a series of divisions. Subsequent nuclear migration generates a(n) ________
A) homeodomain
B) syncytium
C) zygote
D) maternal effect
E) cleavage nucleus
Answer: B
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Bacterial and eukaryotic cells primarily control gene expression at the level of transcription. If instead cells exerted control of gene expression primarily at the post-translational level, what would be different?
A) The ability to rapidly respond to environmental change would be reduced. B) Cells would expend significantly more energy. C) Genes would no longer be transcribed. D) Translation of mRNA into protein would not occur.
A blood test cannot determine if a person is a carrier of Tay-Sachs disease because the mutant allele is undetectable
a. True b. False Indicate whether the statement is true or false
Arrow "B" points to a structure that
a. is one of the four exclusive features of chordates. b. extends anteriorly into the head region. c. provides support for muscle contraction. d. is replaced in most adult vertebrates by the vertebral column. e. includes all of these
A cactus spine and a pea tendril illustrate homoplasy because both are modified leaves
__________________ Indicate whether the statement is true or false.