The barriers to invasion by microbes can involve
a. urine.
b. the symbiotic microorganisms already in the
body.
c. ciliated mucous membranes.
d. lysozyme and other enzymes.
e. all of these.
Answer: e
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What type of test affixes an antigen to an inert particle such as a latex bead?
A. Cross-reactions B. Agglutination C. Precipitation D. Specificity E. Sensitivity
All steroid hormones are synthesized from ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements describes the correct flow of energy conversions through living systems?
A. Chloroplasts convert solar energy to the chemical energy of nutrient molecules. B. Chloroplasts produce CO2 and H2O during photosynthesis. C. Chloroplasts burn glucose into ATP molecules during cell respiration. D. Mitochondria convert ATP molecules into glucose. E. Mitochondria capture solar energy and convert it to oxygen.
Which of the following act at the post-translational stage to regulate expression of a gene?
A: Alternative splicing of exons. B: Targeted degradation of the mRNA C: Phosphorylation of a protein. D: B and C. E: A and C. F: All of the above.