Of the following features, which is the most widely shared in the animal kingdom?
A. A triploblastic embryo
B. Protostome development
C. Radial cleavage
D. A body plan with symmetry
E. Molting of a cuticle or exoskeleton
Answer: D
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Cells infected with animal viruses lyse because
A. the release of the virions depletes the cell of energy. B. the virus releases enzymes that lyse the cell. C. functions necessary for cell survival are not carried out and the cell dies. D. the virus RNA and cellular protein interact to kill the cell.
Which of the following is the last structure that
a sperm travels through as it leaves the body? a. ureter b. urethra c. vas deferens d. ejaculatory duct e. epididymis
Chromatin is an extraction of pure DNA. Indicate whether the statement is true or false
Which of the following microorganisms are not eukaryotic?
a. bacteria b. yeasts c. molds d. protozoa