Place these genes in their temporal order of expression from earliest to latest during Drosophila development.
A. Bicoid, Gap, Homeotic
B. Homeotic, Gap, Bicoid
C. Homeotic, Bicoid , Gap
D. These genes are not expressed at different times during development. They are expressed at the same time, but in a different spatial order.
E. Kruppel, gooseberry, even-skipped
A. Bicoid, Gap, Homeotic
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Which of the following is produced directly by the stem apical meristem (SAM)?
A. protoderm B. vascular cambium C. cork D. pith E. bark
The key elements of a PCR reaction are ____
a. the four nucleoside triphosphates, DNA primase, DNA polymerase, and an agarose gel b. a pair of primers, the four nucleoside triphosphates, DNA primase, and DNA polymerase c. DNA with the target sequence to be amplified, the four nucleoside triphosphates, DNA primase, and DNA polymerase d. DNA with the target sequence to be amplified, a pair of primers, the four nucleoside triphosphates, and DNA primase
e. DNA with the target sequence to be amplified, a pair of primers, the four nucleoside triphosphates, and DNA polymerase
Which human activity is an example of hydrologic alteration?
a. overfishing b. small-scale diversion of water for agriculture c. damming of rivers d. digging wells e. desalination
Organisms of the mesopelagic zone are characterized by:
What will be an ideal response?