In bacteria the RNA polymerase holoenzyme consists of?
a. a sigma subunit and the core polymerase
b. a sigma subunit, the core polymerase, and EF-Tu
c. the sigma subunit and a ribosome
d. the core polymerase and EF-G
Ans: a. a sigma subunit and the core polymerase
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In order to prove genetic recombination occurred through material (DNA) exchange between homologous maize (corn) chromosomes, Harriet Creighton and Barbara McClintock:
A. stained individual chromosomes to see banding, and then observed segregation of bands. B. observed specific morphologic features of one chromosome being "traded" with its homolog. C. created mutations of chromosomes via irradiation and observed transfer of damaged DNA between homologs. D. labeled one chromosome with 32P and observed the transfer of radioactivity to the homolog.
What area of the body will contain the smallest population of microorganisms?
a. Anal opening b. Fingertips c. Mouth d. Nose e. Eyes
Which of the following is a flaplike structure
that helps prevent food from entering the windpipe?
a. uvula b. pharynx c. larynx d. epiglottis e. esophagus
An allele's abundance within a population is referred to as ____ frequency
a. allele b. mutation c. ratio d. population e. gene