Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage.
2. Large 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.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
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The location of a gene on a chromosome is called the locus
1.True 2.False
Four of these are correctly matched. Select the
exception. a. cnidarians; nematocysts b. sponges; spicules c. flatworms; bilateral symmetry d. echinoderms; protostomes e. annelids; segmented body
Reproductive isolation
A. is maintained by certain prezygotic and postzygotic barriers. B. is necessary for species to remain separate. C. means there is no gene flow between two groups of organisms. D. All of the choices are correct. E. None of the choices are correct.
Vampire squid (Vampyroteuthisinfernalis) are deep-sea cephalopods with features similar to both octopus and squid. Extensive video recordings show the diet of the vampire squid consists of items like crustacean remains and fecal pellets. Which of the following terms describes the position of the vampire squid in the deep-sea trophic pyramid?
A. Primary producer B. Secondary carnivore C. Detritivore D. Herbivore E. Primary carnivore