As am embryo develops, different sets of genes are regulated by

a. promoters and operators
b. mRNA and lac repressors
c. operons and operators
d. transcription factors and repressors


Ans: d. transcription factors and repressors

Biology & Microbiology

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Biological molecules with dipole moments:

A. are typically called nonpolar molecules. B. are typically called polar molecules. C. are found in environments in which they can interact with other nonpolar molecules. D. always display resonance. E. also have no single electrons in their outer valence shell.

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The evolution of prezygotic barriers to reproduction after postzygotic barriers already exist is called ____

a. species fusion b. reinforcement c. adaptive radiation d. geographic isolation e. hybridization

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Smoke from fossil fuels, motor vehicle exhaust, and nitrogen fertilizers can lead to

a. greater cloud formation. b. acid rain. c. basic rain. d. rain with high mineral content. e. salted rain.

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What is the function of ciliated cells in the conducting zone?

A) propel mucus containing trapped particles toward the glottis B) move macrophages down the conducting zone toward the respiratory zone C) engulf foreign material that has been trapped within the mucus D) provide the rigid support that keeps the conducting zone open E) produce a viscous solution called mucus

Biology & Microbiology