Among adults Chlamydia trachomatis is an STD, but among children who are not sexually active, it can cause ocular infections which may be spread
A) by flies.
B) in saliva.
C) on hands.
D) on hands or by flies.
E) by contact with saliva or blood.
D
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Which of the following would be most likely to lead to the development of cancer?
A. the activation of a tumor suppressor gene B. the activation of a proto-oncogene C. the activation of an oncogene and an inactivating mutation in a tumor suppressor gene D. the activation of an oncogene and the activation of a tumor suppressor gene
Which one of the following is the fibrous, white outer covering of the eye?
A. sclera B. lens C. pupil D. retina
Which of these white blood cells are phagocytic?
A. neutrophils B. macrophages C. lymphocytes D. both neutrophils and macrophages E. both lymphocytes and macrophages
Which of the following is not true of the gram’s staining procedure?
A) It works for all bacteria B) The stain used is crystal violet C) It differentiates between gram-positive and gram-negative bacteria D) Some bacteria lose the stain by decolorization E) An iodine solution is used