What are the advantages of radial symmetry to a sessile or slow moving organism?
What will be an ideal response?
Since sessile organisms do not move, it would be disadvantageous if all the sensory organs of the animal were located at one end of the animal. This arrangement would leave the opposite end unprotected. Radial symmetry allows the equal distribution of senses around the body in a manner not unlike the distribution of guard towers around a castle. Food can be collected from any direction by feeding structures around the animal. This same argument can be applied to slow moving animals.
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Genetic drift occurs in a population. Which of the following statements might be true?
A) Genetic drift increased the population's fitness. B) Genetic drift decreased the population's fitness. C) The population was relatively small. D) The population experiences a decrease in genetic variation. E) Any of the statements can be true.
Which of the following molecules will contain an anticodon?
In the diagram, which of the following is true?
A. Both diagrams show developmental sequences occurring in the same animal.
B. Both diagrams show blastulae.
C. Diagram II shows gastrulation in a bird.
D. Diagram I shows gastrulation in a frog.
E. Diagram I shows gastrulation in a mammal and diagram II shows gastrulation in a reptile.
What closes nicks between DNA fragments, forming a covalent bond that ties or joins the fragments together?
a. DNA ligase b. helicase c. topoisomerase d. primase