Any deviation in normal gene dosage is lethal
A. true
B. false
B
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An egg with 22 chromosomes that is fertilized by a normal sperm will result in
a. a zygote with trisomy. b. a zygote with disomy. c. a zygote with monosomy. d. a zygote with normal chromosome number.
What is the name of the specialized stinging cells that jellyfishes have as part of their epidermis, and which they use to paralyze small prey?
a. tentacles b. flame cells c. choanocytes d. cnidocytes
The Streptokinase secreted by Streptococcus pyogenes
A. Lyses leukocytes, platelets, and erythrocytes B. Lyses blood clots and facilitates spread of bacteria in tissues C. Degrades complement component C5a D. Depolymerizes cell-free DNA in purulent material
Birds, snakes, lizards, turtles, and crocodiles are all thought to share a common ancestor and several homologous traits. Assuming that this is true, these groups of animals and their common ancestor would represent
A. a polyphyletic group. B. an outgroup. C. a species cluster. D. a monophyletic group. E. homoplastic convergence.