When the p53 gene is overexpressed in normal cells, the cells are killed.
Answer the following statement true (T) or false (F)
False
Expression of the p53 gene seems to trigger cell death only in cancer cells. Elevating the p53 level in a normal cell doesn't do any harm.
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Most simple invertebrates obtain their oxygen by diffusion directly from the surrounding
A. mud. B. air. C. water. D. blood.
Suppose that you use the sequence of the lacI gene, whose function you know is to encode a transcription factor, to find similar sequences in another bacterial strain. Are you more likely to find similar operons or similar transcription factors?
What will be an ideal response?
In 1942 a scientist testing part of a radar system discovered that a candy bar in his pocket had melted. Intrigued, he tried placing an egg near the system he was working on; it exploded and splattered him with hot egg. In this way it was discovered that
part of the radar system could be used to cook foods, which led to the development of the microwave oven. When this kind of repurposing occurs in biological systems, it is called A) paedomorphosis. B) mutation. C) exaptation. D) adaptive radiation.
The maintenance of a constant internal environment in an organism is called _____.
Fill in the blank(s) with the appropriate word(s).