What are all the enzymes involved in the digestion of proteins?
A) pepsin
B) lipase
C) peptidase
D) maltase
E) trypsin
A) pepsin
C) peptidase
E) trypsin
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The last common ancestor of all bilaterians is thought to have had four Hox genes. Most extant cnidarians have two Hox genes, except Nematostella (of ?-catenin fame), which has three Hox genes. On the basis of these observations, some have proposed that the ancestral cnidarians were originally bilateral and, in stages, lost Hox genes from their genomes. If true, this would mean that _____.
A) the Radiata should be a true clade B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral trait C) Hox genes play little actual role in coding for an animal's "body plan" D) the Cnidaria may someday replace porifera as the basal bilaterians B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral
Intraspecific competition and predation are ____ factors
a. crowding b. density-dependent c. reproductive d. population e. logistic
In land plants, ________ transports water and minerals from the soil, and ________ transports food created from photosynthesis.
a. xylem; phloem b. xylem; spores c. phloem; xylem d. phloem; gametes
In many animals, ________ guides learning by determining what type of information can be learned, meaning that what an animal can learn is often biologically influenced.
A. consciousness B. instinct C. operance D. free will