23) to form a double helix. The specific interactions that 23) Two antiparallel

Question

23) to form a double helix. The specific interactions that 23) Two antiparallel strands of permit this phenomenon occur by way of A) hydeogen: nitrogenous bases B) Jonic; phosphate groups D) ionic; nitrogenous bases ED hydrogen; deoxyriboses 24) Which of the following places the seps in the correct sequence I-Staining 2-Making a smear 3-Plxing A) 3-2-1 8) 1-3-2 C) 2-3-1 D) 1-2-3 E) The order is unimportant 25) 25) A virus measures 100 nm in length. What is its length in Ham? B) 10 m E) 0.001 jam C) 0.01 m D) 1 um 26) 26) The negative stain is used to A) visualize endospores. B) determine cell size. C) determine Gram reaction. D) determine flagella arrangement E) visualize capsules 27) Which microscope is used to observe a specimen that emits light when illuminated with an 27) ultraviolet light? A) fluorescence microscope B) electron microscope 9) phase-contrast microscope D) darkfield microscope E) compound light microscope 28) Which microscope achieves the highest magnification and greatest resolution? 25 A) electron microscope C) darkfield microscope D) compound light microscope E) fluorescence microscope 29) Which of the following correctly traces the path of light through the compound microscope? 29) A) light source; condenser; specimen; objective lens; ocular lens B) condenser, light source; specimen; ocular lens; objective lens C) light source; specimen; condenser; objective lens; ocular lens D) condenser, light source; specimen; objective lens; ocular lens E) light source; condenser; objective lens; specimen; ocular lens

Explanation / Answer

23.(A)hydrogen;nitrogenous bases.

Adenine forms double hydrogen bond with Thymine and cytosine form triple bond with guanine.

24.(C) 2-3-1

First the smear is made and than heat fixed after which it is stained.

25.(A)0.1 micrometre

Since 1 micrometre =1000 nm

100nm=0.1 micrometre

26.(B) determine cell size.

Stain readily gives hydrogen ion and becomes negative.

27.(A)Flouroscence microscope

28.(A)Electron microscope

It uses beam of electrons to create an image of specimen.

29.(A)light source,condenser,specimen,objective lens,ocular lens.

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