Cnidarians (such as jellyfish) and flatworms have _____ digestive tract, ______
a. a complete; processing food from mouth to anus
b. a blind ended; expelling undigested wastes through the single opening
c. a blind ended; completely digesting anything entering it
d. no; absorbing nutrients by phagocytosis
e. no; capturing food by filter feeding
B; Cnidarians and flatworms have a gastrovascular cavity, which is a blind-ended gut with a single opening. There will always be some undigested waste, and this must leave through the single opening.
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For the process of diffusion to occur, molecules must
A. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached. B. move from areas of low concentration to areas of higher concentration until an equilibrium is reached. C. remain stationary until their molecular motion allows for an equilibrium to be reached. D. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium. E. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport.
Both cyanobacteria and phytoplankton are
A) multicellular. B) eukaryotic. C) photosynthetic. D) parasitic. E) heterotrophic.
Sequencing the genes of humans is important because
A) it provides information on how to build lipids in the cell. B) it will allow scientists to create human clones. C) knowing the nucleotide sequence of human genes will aid in the treatment of diseases caused by them. D) it will give us a better understanding of agricultural animals.
EPSP is a process of activating postsynaptic neuron by (i) ________ of the membrane that is accompanied by (ii) ___ influx.
a) (i) depolarization, (ii) Na+ b) (i) hyperpolarization, (ii) Na+ c) (i) depolarization, (ii) Cl- d) (i) hyperpolarization, (ii) Cl-