Which of the following nondisjunction disorders must be due to an event is sperm development: XO,

XXX, XXY or XYY? What will be an ideal response?


Only XYY would definitely be due to sperm development event. In the other three, the missing or
extra X could be contributed be due to an even it egg development. However, the extra Y in XYY
could only come from the male and must be due to a sperm development nondisjunction.

Biology & Microbiology

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The first human gene therapy was approved for patients suffering ADA (adenosine deaminase) deficiency. In this therapy, lymphocytes were removed from the patient, the normal ADA gene was put into the cells, and the cells were returned to the bloodstream. How was the normal ADA put into the lymphocytes?

A. Via the polymerase chain reaction. B. By fusing normal lymphocytes with deficient lymphocytes. C. Microinjection. D. Via a plasmid vector. E. Via a viral vector.

Biology & Microbiology

The diameter of an intermediate filament is 25 nm.

a. true b. false

Biology & Microbiology

How many total daughter cells are produced from each parent cell as a result of meiosis?

A) Two B) Millions C) One D) Four

Biology & Microbiology

Which of these is incorrect regarding fermentation?

a. there is a net gain of only 2 ATP per glucose b. it occurs in the cytoplasm c. the process starts with glucose entering glycolysis d. NADH donates electrons to the electron transport chain e. it is anaerobic

Biology & Microbiology