Which of the following substances pass from mother to child through breast milk?
a. antibodies only
b. alcohol only
c. all of the choices
d. drugs only
c
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Which of the following allow communication between the cells of the heart muscle tissue, resulting in the coordinated beating of the heart?
a. tight junctions b. anchoring junctions c. desmosomes d. gap junctions
ACh regulates neuromuscular junction through (i)______________, which is expressed in skeletal muscle. (ii)_________ is an (iii)_________ of the receptor.
a) (i) ACh nicotinic receptor, (ii) nicotine, (iii) agonist b) (i) ACh muscarinic receptor, (ii) nicotine, (iii) agonist c) (i) ACh nicotinic receptor, (ii) muscarine, (iii) antagonist d) (i) ACh muscarinic receptor, (ii) muscarine, (iii) antagonist
A patient's serum, Mycobacterium, guinea pig complement, sheep red blood cells, and anti-sheep red blood cell antibodies are mixed in a test tube. What happens if the patient has antibodies to Mycobacterium?
A) Bacteria fluoresce. B) Hemagglutination occurs. C) Hemagglutination-inhibition occurs. D) Hemolysis occurs. E) No hemolysis occurs.
Proper sequence:
1. Homologous chromosomes are brought into perfect alignment by a protein complex forming tetrad. 2. Chromatids separate and go to opposite poles. 3. Homologous chromosomes separate and go to opposite poles. 4. Chromatids of one homologous chromosome exchange fragments with chromatids of the other chromosome. 5. Pairs of homologous chromosomes line up along the cells equatorial plate.