How do sponges differ from all other animals?
A) Sponges exhibit radial symmetry.
B) Sponges are autotrophs.
C) Sponges lack a true body cavity.
D) Sponges lack true tissues.
D
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Which of the following statements about essential nutrients are true? Essential nutrients _____
I) are necessary for plant growth and reproduction II) are required for a specific structure or metabolic function III) cannot be synthesized by a plant IV) are produced by symbiotic bacteria A) I and IV B) II, III, and IV C) I, II, and III D) I, II, III, and IV
How is the Ti plasmid used to create transgenic plants?
a. The Ti plasmid allows all of the plant cells to host the bacteria Rhizobium radiobacter and thus express the foreign gene that was inserted into the bacterial chromosome. b. The Ti plasmid inserts the foreign gene directly into the plant's nuclear DNA. c. Once the Rhizobium radiobacter forms a tumor in the plant, the tumor cells can take up the foreign DNA and incorporate it into their chromosomes. d. The Ti plasmid inserts the foreign DNA into the DNA in the chloroplast. e. The Ti plasmid inserts the foreign DNA into the plant's mitochondrial DNA.
Sharks, rays, and skates belong to what group?
a. lobe-finned fish b. ray-finned fish c. cartilaginous fish d. bony fish e. reptiles
Why does measuring oxygen consumption estimate how a Burmese python generates body heat?