Which of the following statements about CRISPR are accurate? Select all that apply.A) CRISPR was first discovered in single-celled eukaryotes.B) Where naturally found in cells, CRISPR acts as a form of immune defense against viruses.C) CRISPR utilizes an endonuclease enzyme called Cas9.D) CRISPR can only be used by researchers to target a specific sequence of nucleotides in single-celled prokaryotes and eukaryotes.E) CRISPR requires a guide RNA molecule to identify the nucleotide sequence destined for editing.
What will be an ideal response?
B, C, E
CRISPR was first discovered in prokaryotes where it acts as a form of immune defense against viruses. CRISPR utilizes an endonuclease enzyme called Cas9 and guide RNA molecules that identify, and complementary base-pair to, nucleotide sequences destined for editing. Currently, CRISPR can be used in all types of organisms, not just single-celled prokaryotes and eukaryotes.
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The larger the organism, the more genes the organism will have in its genome
A. true B. false
If the downward slope of the line continues, what would be the expected sea ice volume in 2020?
A. 15.5 millions of square kilometers B. Less than 13 millions of square kilometers C. A little over 14.5 millions of square kilometers D. A little over 13.5 millions of square kilometers
Fertilization of an ovum normally occurs in the
A. cervix. B. ovary. C. vagina. D. uterus. E. oviduct.
What is the major challenge with developing new synthetic antimicrobials?
A) deciding what bacteria to test it on B) finding the right dose C) the need to screen thousands of potential candidates D) figuring out if the drug is bacteriostatic or bactericidal E) choosing which bacterial structure to target