In a bacterium that possesses antibiotic resistance and the potential to persist through very adverse conditions, such as freezing, drying, or high temperatures, DNA should be located within, or be part of, which structures?
1. nucleoid region
2. endospore
3. fimbriae
4. plasmids
A) 1 and 2 only
B) 1 and 4 only
C) 2 and 4 only
D) 1, 2, and 4
D
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Nonpolar hormones can pass through the intestinal cell membrane without being digested, and therefore can be taken orally. What hormones might therefore be available as pills?
A. Thyroid hormones and steroid hormones B. Insulin and growth hormone C. Calcitonin and glucagon D. Melatonin and prolactin E. Oxytocin and antidiuretic hormone
Please match the virulence factor of Streptococcus pyogenes to its description.
C carbohydrate A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots D) Projecting surface antigen that facilitates adherence and resists phagocytosis E) Chemical surface layer that prevents an immune response by the host F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues
Bivalves lack which of the following molluscan
features? a. foot b. radula c. mantle d. shells e. visceral mass
What did the X-ray diffraction patterns initially reveal about the DNA molecule?
A) It is of uniform diameter and has a helical structure. B) It is a helical molecule with paired bases in the center. C) It is double-stranded with antiparallel strands. D) It is acidic, phosphorus-rich, and large. E) It contains hereditary information.