How do planarians survive without a circulatory system? What will be an ideal response?
Concepts to Consider: Planarians are usually fairly small animals. The small size
maximizes the ratio of surface area to body volume, which maximizes diffusion. Maximizing
surface area is also accomplished through the flat body shape of these animals. Internally,
diffusion of body fluids to various regions of the body is accomplished through a highly
branched gut, which maximizes the surface area with which it comes in contact. Combined,
these features allow for efficient gas exchange, waste removal, and the delivery of nutrients,
which are some of the functions carried out by a circulatory system.
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Which of the following events do notoccur during spliceosome assembly on pre-mRNAs?
A. U1 snRNP binds to the 5' splice site. B. U2 snRNP binds to the branch point. C. U6 snRNP binds to the 3' splice site. D. U5 snRNP binds to the 5' splice site.
In prokaryotes, most of the control of gene expression is at the ____ level
a. transcriptional b. transcript processing c. transport d. translational e. post-translational
How many oxidation reactions occur during the Citric acid cycle?
A. 2 B. 9 C. 6 D. 4 E. 1
________'s concept of preparedness suggests that people are biologically prepared by their evolutionary history to acquire fears more eaily than others.
Fill in the blank(s) with the appropriate word(s).