What features of charophytes provides evidence for charophytes being the closest relative to land plants?
A. Charophytes are fully terrestrial.
B. Charophytes possess plasmodesmata.
C. Charophytes are the only photosynthetic protists.
D. Charophytes produce seeds and flowers.
Answer: B
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In studying an E. coli strain containing a known frameshift mutation, you isolate a mutant in which this frameshift is suppressed. You therefore expect to find which of the following associated with the suppression? (Assume the frameshift has not been corrected in the coding for the peptide.)
A) suppressor tRNAs encode an amino acid for a stop signal B) suppressor tRNAs encode a four-nucleotide anticodon C) suppressor tRNAs encode a two-nucleotide anticodon D) both choices B and C E) all of the above
The ________ microscope is capable of atomic resolution of specimens, even when they are immersed in water.
Fill in the blank(s) with the appropriate word(s).
An atom's ________ are found in its nucleus
A) neutrons and protons B) protons only C) neutrons and electrons D) electrons, protons, and neutrons
A retrovirus uses ________ to make a DNA copy of RNA
A) ras proteins B) CDKs C) cyclins D) reverse transcriptase