At which stage is the foreign gene introduced into the developing embryo?
a. blastocyst, via a transgenic cell
b. egg, via direct microinjection of the new DNA
c. sperm, via direct microinjection of the new DNA
d. in cell culture, prior to fertilization
e. it all depends on the method the particular researcher prefers.
A
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If you are hiking through the desert for several days, one would pack which of the following to ensure proper hydration?
A) a drink with a combination of water and electrolytes B) caffeinated beverages C) bottled water kept at room temperature D) bottled water that had been frozen to ensure that it would be as cold as possible
Which of the following statements is false?
A. Decreasing levels of oxygen in the blood are detected by chemoreceptors in the brainstem. B. Breathing is controlled by both voluntary and involuntary mechanisms. C. Chemoreceptors involved in the homeostatic control of breathing are located in the brainstem and the carotid and aortic bodies. D. Stronger or more frequent contraction of respiratory muscles helps to remove excess CO2 from the blood. E. As an organism's activity level increases, the level of CO2 in the blood will increase and stimulate faster or stronger breathing.
What is an afterimage?
What will be an ideal response?
Bacterial cells have only one DNA molecule, which is double stranded and is replicated in essentially the same fashion as in eukaryotes
Imagine that, following the techniques of other scientists studying DNA, you created a bacterial cell that contains only radioactive nitrogen in its DNA. You then place the cell in a culture medium containing only "regular" (nonradioactive) nitrogen. Based on this scenario and your knowledge of DNA structure and replication, how many cells will contain some DNA with radioactive nitrogen after four rounds of cell replication? A) 16 B) 1 C) 2 D) 4 E) 8