What is the correct order of gene expression in the early Drosophila embryo?
A. gap genes, pair-rule genes, segment polarity genes
B. gap genes, segment polarity genes, pair-rule genes
C. pair-rule genes, gap genes, segment polarity genes
D. segment polarity genes, pair-rule genes, gap genes
Answer: A
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On a phylogenetic tree, each node (branchpoint) represents a divergence event, and the length of the branches represents the number of molecular changes that have taken place between the nodes.
Answer the following statement true (T) or false (F)
Answer the question using the accompanying figure. What does letter E represent?
a. different RNA molecules transcribed from a coding region of DNA b. the products of a PCR reaction in which the primers annealed to multiple sites c. the products of a PCR reaction performed without one of the nucleoside triphosphates d. the products of a PCR reaction that had more than two primers e. a DNA marker ladder
One of the mRNA codons specifying the amino acid leucine is 5?-CUA-3?. Its corresponding anticodon is:
a. 5?-GAT-3?. b. 3?-AUC-5?. c. 3?-GAU-5?. d. 3?-GAT-5?. e. 5?-GAU-3?.
What is an R plasmid?
A) They are a plasmid that can exist in the chromosome or outside the chromosome. B) It is an F factor that has picked up part of a bacterial genome. C) They carry a gene for resistance to an environmental attribute, such as heavy metals, and genes for the transfer of the plasmid. D) They function in bacterial recombination. E) They are the plasmids that carry the F factor.