Chloroplasts are a feature of ________________
a. animal cells.
b. plant cells.
c. bacteria.
d. all cells.
b
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A physician discovered a cancerous tumor in the cartilage of a patient. What type of tumor is this?
A. myoloma B. retroviral C. sarcoma D. leukemia E. cyst
When a person is tested for HIV, the test is considered positive if _______ to the HIV are present.
A. bacteria B. antigens C. antibodies D. T-cells E. natural killer cells
Which genetic disease(s) are caused by defective proteins that are not enzymes?
A) Tay—Sachs disease and phenylketonuria B) Sickle-cell anemia and cystic fibrosis C) Lesch—Nyhan syndrome. D) Albinism and alkaptonuria E) All of these
In birds and mammals, a vestige of the sinus venosus of the fish heart remains as the sinoatrial node, which serves as a(n)
A. inhibitory node. B. diastole detector. C. baroreceptor. D. pacemaker. E. site of erythropoiesis.