Which lineage includes two species of coelacanths and six species of lungfish among its living members?
a. Actinopterygii
b. Myxinoidea
c. Petromyzontoidea
d. Sarcopterygii
Ans: d. Sarcopterygii
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T cell-target cell interactions induce specialized Tc cells to produce ________ that kill virus-infected target cells
A) perforins B) granulozymes C) leukocidins D) pyogens
The binding of ____to ____ directly triggers the power stroke in skeletal muscle contraction
a. myosin; actin b. tropomyosin; myosin c. myosin; troponin d. tropomyosin; actin
e. troponin; tropomyosinIf an experimenter interferes with the
mesoderm in an egg, which of the following systems would NOT be affected by the experimenter?
a. circulatory system b. muscular system c. reproductive system d. integumentary system e. excretory system
Which of the following can be used to accurately describe viruses?
a. They are small, cellular infectious agents that are only capable of reproducing when inside a living cell, and they can attack plants as well as animals. b. Each is typically a piece of genetic material encased in proteins, and they can reproduce on their own. c. They can attack plants, animals, and protozoans, and each is typically a piece of self-replicating genetic material encased in proteins. d. Typically just a piece of genetic material encased in proteins, viruses are small, non-cellular infectious agents that are only capable of reproducing when inside a living cell such as those of plants, animals, fungi, protozoans, or bacteria.