One element that does not cycle into the atmosphere is phosphorus
____________________ Indicate whether the statement is true or false.
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The histone octamer forms a tightly packed particle, but the N-termini that protrude from the octamer are less ordered. Which is the best explanation for this observation?
A. The charges on the amino acid residues in the N-terminal tails are primarily acidic and repel each other. B. The charges on the amino acid residues in the N-terminal tails are primarily basic and flex to accommodate the DNA. C. The N-terminal tails must be flexible because they bind to and then release DNA during transcription. D. The N-terminal tails must be more flexible because they form intermolecular contacts with other nucleosomes. E. The N-terminal tails must be more flexible because they interact within the minor groove of DNA.
The slide coagulase test is a rapid screening test for the production of:
a. clumping factor. b. free coagulase. c. extracellular coagulase. d. catalase.
A build-up of pressure in this area causes the eye to change shape and the blood vessels supplying the rods and cones to collapse. This area where the pressure may rise is called the ________
A) vitreous humor B) posterior chamber C) anterior chamber D) tear glands
Using a microscope in the science lab, Jill observed two unknown cells: Cell 1 and Cell 2. Cell 1 she identified as a plant cell and Cell 2 as an animal cell. Her teacher told her she identified the cells correctly. What did Jill most likely observe to correctly identify the cells?
A. Cell 2 had a cell membrane and Cell 1 did not. B. Cell 1 had a cell wall and Cell 2 did not. C. Cell 2 had a chloroplast and Cell 1 did not. D. Cell 1 had a nucleus and Cell 2 did not.