Bacteriophage T4 blocks transcription of host genes using an enzyme that transfers an ________ from NAD onto the alpha subunit of RNA polymerase.
What will be an ideal response?
ADP
ADP-ribose
ADP-ribosyl
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All sponges _____
A) have three germ layers B) are free swimming as adults C) reproduce only asexually D) are parasitic E) are sessile benthic
When two allelic variants are expressed equally, they are said to be
A) exclusive. B) uncommitted. C) repressed. D) codominant.
Which statement about microscopes is true?
a. Transmission electron microscopes show details of the internal structures of cells. b. Electron microscopes are best for viewing live cells because of high resolving power. c. Light microscopes require the use of stains which typically kill cells. d. Dissecting microscopes have a higher magnification than light microscopes.
In transduction, two prokaryotic cells of different mating types come together and genetic material is transferred from
one cell to another Indicate whether the statement is true or false.