Once a prion enters a nerve cell, it essentially
A) assumes the correct folding orientation for the protein.
B) stops the cascade of misfolding events associated with adjacent cells.
C) becomes self-propagating, causing misfolding of nearby normal proteins.
D) differentiates into a nonreplicating virus.
E) differentiates into a replicating virus.
C
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In which plant cell or tissue would the pressure component of water potential most often be negative?
A) leaf mesophyll cell B) stem xylem C) stem phloem D) root cortex cell E) root epidermis
In facilitated diffusion, the membrane components responsible for transport are proteins
Indicate whether the statement is true or false.
A gene locus is
a. a recessive gene. b. an unmatched allele. c. a sex chromosome. d. the location of an allele on a chromosome. e. a dominant gene
I am a ribonucleoprotein; I contain both a polypeptide and an RNA molecule. My RNA binds to unique sequences on a DNA molecule, targeting them for cleavage by my polypeptide. I occur naturally in microbes to protect against viral attack, and I can be engineered in the lab for precision DNA editing. What am I?
A. Cas9 nuclease B. EcoR1 restriction enzyme C. 3' oligonucleotide D. RNA polymerase