In precipitation tests, maximum precipitation takes place when

A. the amount of the antibody exceeds the amount of the antigen.
B. the amount of the antigen exceeds the amount of the antibody.
C. the amount of the antibody and the amount of the antigen are at optimal proportions.
D. a toxin is present.
E. a complex solution of many antibodies is used.


Answer: C

Biology & Microbiology

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Which is true regarding translation in bacteria?

A. The 70S ribosome is composed of a 20S and 50S subunit. B. Translation begins with formation of the 30S initiation complex. C. Translation ends when the Shine-Delgarno sequence is reached. D. All of the choices are correct.

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The correct functions of your lungs contribute to the normal pH level of between 7.35 and 7.45. If your lungs do not exchange and remove carbon dioxide from your blood, the blood pH will change. A pH 6.4 reading of your blood indicates

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A. a health problem due to the pH value being 10X higher OH- concentrations than normal in your body.
B. a health problem due to the pH value being 2X higher OH- concentrations than normal in your body.
C. a health problem due to the pH value being 2X higher H+ concentrations than normal in your body.
D. no health risk, as part of normal pH changes in your body that in this case bring it closer to neutral pH.
E. a health problem due to the pH value being 10X higher H+ concentrations than normal in your body.

 

Biology & Microbiology

The male gametophyte is also called an embryo sac

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

When a protein is synthesized, cis- or trans-splicing of that protein occurs ________.

A. during transcription B. prior to transcription C. between transcription and translation D. following translation

Biology & Microbiology