The CRISPR-Cas system of gene editing is based on what naturally occurring biological process?
A) viral defense against eukaryotic defenses B) eukaryotic defense against viral infection
C) viral defense against bacterial defenses D) bacterial defense against viral infection
Answer: D
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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.
As males and females age they produce lower volumes of sex hormones. For women, taking
testosterone to increase libido in becoming more common. Why is the same not common for males? What will be an ideal response?
Which one of the following best explains why humans must constantly breathe in oxygen in order to stay alive?
A) Oxygen is an important source of energy for cells and is used to make glucose. B) Oxygen is essential for the production of most of the ATPs required to fuel cell functions. C) Oxygen must be available to cells in order for them to make the sugars necessary to supply energy for cell functions. D) Oxygen is used to drive the anaerobic breakdown of sugars for the production of ATP. E) Oxygen is converted to carbon dioxide, which is then used to drive the production of ADP.
Chromatin is
A. immature nucleoplasm. B. a cytoplasmic organelle. C. the arrangement of proteins. D. uncoiled DNA of a chromosome.