In terms of food collection, what is an advantage of radial and bilateral symmetry? Include examples of both forms of symmetry in your answer
What will be an ideal response?
The radial symmetry of cnidarians and echinoderms allows them to move equally well in all directions to respond to stimuli and to feed or capture prey. The bilateral symmetry of arthropods, annelids, and chordates (to name a few) allows them to specialize food capture and movement in one direction.
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Chancroid
A. presents with a hard chancre. B. is caused by Haemophilus ducreyi. C. is very painful in both sexes. D. is caused by a spirochete.
Which of the following is true of movement
through the phloem?
a. movement through phloem is through live cells b. movement between sieve tube members is via plasmodesmata c. movement through the phloem is not necessarily up d. the phloem cells through which movement occurs are non-nuclear e. all of these are true about movement through the phloem
Which of the following is NOT a defining trait
found in chordate embryos?
a. notochord b. dorsal, hollow nerve chord c. gill slits d. muscular tail e. limb buds
Which of the following best describes processes that take place during cell communication to produce a cellular response?
A) A series of changes takes place in relay molecules through a signal transduction pathway.
B) Local regulators convert electrical signals to chemical signals to cause movement in a cell.
C) Signaling molecules detect changes in a cell's environment and trigger hormone release.
D) Transduction causes signaling molecules to bind to receptors on the surface of a cell.