If bacteria living in salty seawater were displaced to a freshwater environment, the cell structure that would prevent the cells from rupturing is the ________.
A. capsule
B. cell membrane
C. endospore
D. cell wall
E. slime layer
Answer: D
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Which of the following statements is not true of the amino acids?
A) There are more than 60 different kinds of amino acids present in cells. B) The R group of amino acids differs from one amino acid to another. C) Only around 20 amino acids are used in protein synthesis. D) All amino acids exist in two stereoisomeric forms. E) Amino acids have an N-terminus, C-terminus, and R groups.
Using the CRISPR/Cas9 system, a genetically-engineered sgRNA complementary to a target site in the genome binds to Cas9 endonuclease. A mutation can occur at this site when
A) Cas9 cleaves the DNA and nonhomologous end-joining results in a small deletion. B) Cas9 cleaves the DNA and homologous recombination with the homologous chromosome is used to repair the break. C) Cas9 cleaves the DNA to remove the complementary sequence. D) Cas9 cleaves the DNA and nonhomologous end-joining correctly repairs the break.
__________ are heterotrophs that grow as a mesh of
absorptive filaments. Some are plant pathogens. Fill in the blank(s) with the appropriate word(s).
How and why is the two-hybrid system used to find where two proteins interact? Use a real example
What will be an ideal response?