Several genetic disorders, including Fanconi anemia and ataxia telangiectasia, are caused by mutations in ____
a. the cell wall
b. mitochondrial DNA
c. ribosome structure
d. DNA repair genes
e. DNA polymerase genes
d
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An example of a protein that is an electrogenic pump, uniport and an active transport is:
a. H+ pump b. Na+-K+ pump c. H+- sucrose pump d. glucose transporter e. cysteine transporter
Isotopes that give off energy and emit particles are known as ________
Fill in the blank(s) with correct word
Which cells would spend the most time in interphase?
A) skin cells on the hands B) epithelial cells lining the intestine C) nerve cells in the brain D) mucous membrane cells in the mouth
To identify genes coding for essential proteins, researchers can create temperature-sensitive mutations. These mutations allow proper protein folding and cell proliferation at the permissive temperature of 22ºC, but they cause protein misfolding and reduced cell proliferation at a higher restrictive temperature, such as 37ºC. Which of the following mutations might increase protein flexibility and lead to a temperature-sensitive phenotype?
A.) mutation of a lysine (that was involved in an ionic bond with a glutamic acid) to a glycine B.) mutation of a bulky isoleucine that was buried in the protein interior to a glycine (side chain=H) C.) mutation of a alanine to a cysteine, leading to the formation of a new disulfide bond