Certain antimicrobials may be life-threatening
Indicate whether this statement is true or false.
TRUE
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Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage. 2. Very great differences in body form can result from only small differences of gene expression. 3. Radiata have neither an anterior end nor a posterior end. 4. All eumetazoans have cell junctions. 5. Gastrulation is brought about by an invagination of the wall of the blastocoel.
Large cellular polymers assembled by chemically linking monomers together are called ____
a. carbohydrates b. lipids c. proteins d. nucleic acids e. macromolecules
Earth is essentially a closed system with respect to ____
a. energy b. matter c. oxygen d. photosynthesis e. ecosystems
A hypothetical community on a barren mid-Atlantic island consists of two fish-eating seabirds (the booby and the noddy), the fungi and microorganisms that live on the birds' dung, a tick that feeds on these two birds, a cactus, a moth that feeds on
cast-off feathers, a beetle that lives on dung organisms, and spiders that eat the other arthropods. There are no other plants and no lichens. Which pair of organism and trophic structure is incorrect? A) fungi—detritivores B) booby—primary consumer C) moth—detritivore D) cactus—producer