The spines of a cactus are actually modified:a
branches.
b. stems.
c. leaves.
d. roots.
e. trichomes.
c
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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
Which of the following is not true of X-inactivation?
A) It is necessary for dosage compensation. B) It is the cause of calico color in cats. C) The mechanism includes transcription of the XIST gene and chromatin remodeling. D) The XIST RNA is non-coding. E) The master regulatory gene for X-inactivation is sxl or sex-lethal.
The freshwater leech is an organism that feeds off of the blood of other organisms such as frogs and turtles. Which interaction describes the relationship between freshwater leeches and frogs or turtles?
A) herbivory B) predation C) mutualism D) parasitism
All of the following would be examples of entry via the parenteral route EXCEPT:
a. an injection b. a hair follicle?skin c. a bite wound d. surgery e. a skin cut