Invertebrate chordates include __________ and __________, both marine filter-feeders.
Fill in the blank(s) with the appropriate word(s).
tunicates; lancelets
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A portion (location) of DNA that encodes a specific protein is a
Examine this image of chromosomes and identify the structural components.
A. kinetochore.
B. centromere.
C. chromatid.
D. chromosome.
E. gene.
All of the following statements accurately describe eutrophication EXCEPT which one?
A) Eutrophication may be accelerated by agricultural runoff containing fertilizers. B) Eutrophication can be part of a natural process that converts freshwater to marsh to dry land. C) Eutrophication is beneficial and enhances the diversity of life-forms in a body of water. D) Eutrophication accelerates plant and algal growth at the expense of animal diversity. E) Sewage and other organic nutrient pollutants can enhance eutrophication.
Which of the following traits is unique to arthropods?
a. Appendages b. Segmentation c. A ventral nerve cord d. A dorsal anterior brain e. An exoskeleton
Suppose that the circular muscles in an earthworm have become selectively paralyzed such that they are not able to contract. How will this affect the earthworm's locomotion?
A) The earthworm will be able to elongate, but not get thicker. B) The earthworm will be able to get thicker, but not elongate. C) The earthworm will not be able to elongate or get thicker. D) The earthworm will be able to crawl as normal.