What is a difference between embryonic and adult stem cells?
A) The use of embryonic stem cells raises fewer ethical issues than the use of adult stem cells.
B) Embryonic stem cells are undifferentiated; adult stem cells are partially differentiated.
C) It is easier to obtain embryonic stem cells.
D) Adult stem cells are easier to grow in culture.
B
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A clownfish may lure fish towards a sea anemone and get scraps of food in return. What kind of symbiotic relationship does this demonstrate?
a. Commensalism b. Mutualism c. Parasitism d. None of these choices
A large respiratory surface
a. results in a slow rate of gas exchange. b. results in a faster rate of gas exchange. c. has no effect on the rate of gas exchange. d. is important to support the respiratory needs of large animals. e. results in a faster rate of gas exchange, and is important to support the respiratory needs of large animals.
Which statement best describes a lophophore?
a. It is a ciliated ring of tentacles surrounding the mouth. b. It is a structure used for locomotion in the Lophophorata. c. It is the opening also referred to as the anus in the Ecdysozoa. d. It is a larval stage found in the Lophotrochozoa and the Ecdysozoa. e. It is one of the openings to the excretory system of phylum Platyhelminthes.
During nervous-system development in Drosophila, the membrane-bound protein Delta acts as an inhibitory signal to prevent neighboring cells from developing into neuronal cells. Delta is involved in ______________ signaling
(a) endocrine (b) paracrine (c) neuronal (d) contact-dependent