In arthropods, locomotion is accomplished by muscles that work against
A. each other.
B. the exoskeleton.
C. a hydrostatic skeleton.
D. mineralized bones.
E. the pseudocoel.
B. the exoskeleton.
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True or false: Natural selection is always the driving force of speciation
A. true B. false
Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
What will be an ideal response?
In Drosophila, the hunchback gene encodes a protein (HB) that has a role in the development of the thorax. In the zygote and embryo, the expression of hunchback is stimulated by high concentrations of Bicoid protein. Which of the following is accurate about the expression of hunchback in the Drosophila embryo?
A. The HB protein is produced throughout the embryo. B. The HB protein is produced only in the anterior half of the embryo. C. The HB protein is produced only in the posterior half of the embryo. D. The HB protein is produced in the middle of the embryo; but is not produced in the anterior or posterior end. E. No HB protein is produced in the embryo.
Which of the following is a kind of reproduction found only in freshwater sponges?
a. Fragmentation b. Budding c. A single individual producing both sperm and egg d. The formation of gemmules