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

Biology & Microbiology

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If 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

Biology & Microbiology

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

Biology & Microbiology

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; tropomyosin

Biology & Microbiology

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.

Biology & Microbiology