All of the following can positively influence the structure of tooth enamel except
A. antibodies in saliva.
B. fluoride.
C. genetics.
D. lysozyme in saliva.
E. refined sugar.
Answer: E
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In this reaction, ADH represents the
a. enzyme. b. substrate. c. product. d. activation energy. e. trigger.
Which of the following is not true of the antigen-independent period of lymphocyte development?
A. Lymphocytes with specificity for self are destroyed. B. Mature lymphocytes populate lymphatic organs and encounter antigens. C. Many lymphocytes with different specificities are formed. D. Random genetic rearrangements occur to produce different surface protein receptors. E. Lymphocytes form from stem cells in the bone marrow.
One key to Mendel's success was choosing to observe ________ traits, which exhibit one of two possible phenotypes
Fill in the blank(s) with correct word
The hypothesis that cowpox could provide protection against smallpox was tested by ________ and provided the basis for the first vaccine
A) Robert Koch B) Edward Jenner C) Eduard Buchner D) Louis Pasteur E) Lazzaro Spallanzani