What is the difference between a gene knockout and a gene knockdown?
What will be an ideal response?
ANSWER: A gene knockout is when researchers replace the normal gene with a defective one so that no
functional protein product can be made from that gene. A gene knockdown is when
researchers decrease the amount of expression from a gene by using a technique such as
RNA interference. Both are used to assess the phenotype of eliminating or decreasing a
gene’s function in the cell.
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Animal classification has undergone a reassessment in recent years because of:
A. Carl Linnaeus' new data B. comparisons of DNA and rRNA among different taxa C. new, genetically engineered species D. developing resistance to antibiotics E. all of the choices provided
Which scientist(s) discovered the basis for the basepair
rule, which states that the amounts of adenine and thymine match, as do the amounts of cytosine and guanine? a. Avery b. Griffith c. Chargaff d. Hershey and Chase e. Pauling
Many important cellular functions in eukaryotic cells occur within membrane-enclosed organelles, such as cellular respiration occurring within the mitochondria. The membranes of the mitochondria provide a place for enzymes needed for cellular respiration to anchor and function. Prokaryotic cells must also carry out respiration but do not have mitochondria. Where is the most likely place that enzymes needed for cellular respiration are anchored and functioning?
a. the cell wall c. the cytosol b. the chromosome d. the plasma membrane
Most fetuses can survive outside the womb after a minimum of ________ weeks
A) 32 B) 45 C) 15 D) 38 E) 20