Which one of the following incorrectly matches a molluscan group with a feature characterizing that group?
A. Polyplacophora-eight calcareous plates
B. Gastropoda-torsion
C. Bivalvia-reduced head and no radula
D. Nudibranchs-extensive gills in mantle cavity
E. Cephalopoda-closed circulatory system
Answer: D
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Vectors can transfer ____
a. DNA sequences into bacterial host cells for cloning b. DNA sequences into viral host cells for cloning c. cloned viral cells into a bacterial host for cloning d. cloned mitochondria from donor cell to host cell e. cloned chromosomes from the nucleus of a cell into its cytoplasm
Viruses are smaller than
A. human red blood cells. B. All of the answer choices are correct. C. single-celled eukaryotes. D. plant cells. E. bacterial cells.
An atom carries no charge because it has as many electrons as ____
a. protons b. neutrons c. orbitals d. neutrinos e. shells
Testosterone and Estrogen
What will be an ideal response?