Both pH and temperature affect cells by altering proteins' tertiary structure
a. true
b. false
Ans: a. true
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During the elongation stage of transcription ____
a. DNA nucleotides are added to the transcript b. the transcript grows in the 5'®3' direction c. transcription factors recruit RNA polymerase to the template strand
d. the double helix remains single-stranded after being used as a template e. RNA polymerase binds to the promoter region
Which of the following occurs in anaphase I?
a. separation of sister chromatids b. separation of homologous pairs c. crossing over d. independent assortment
Which of the following groups do not contain any species that are autotrophs?
A. Bacteria B. Protista C. Plants D. Archaea E. Fungi
In order to infect a cell, a virus must
A. have a special protein on its surface that can interact with a protein receptor on the surface of the host cell. B. produce a special extension of its cytoplasm when it comes into contact with the appropriate host cell. C. inject its protein into the cell while the nucleic acid remains attached to the host cell surface. D. active burrow through the cell wall or cell membrane of the host cell to reach the cell's nucleus.