Cells that de-differentiate, lose cell cycle control, and lose their attachment to the surrounding cells, are known as ________.
What will be an ideal response?
cancer cells
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The genetic code is said to be degenerate because ____
a. some codons that do not specify an amino acid b. most amino acids are represented by more than one codon c. the code varies considerably between different organisms d. the code is commaless, with no indicators of spaces between codons e. the code varies considerably between different cell types within a multicellular organism
Patent law as it pertains to biotechnology has had to change in recent years in response to
A) the changeable nature of the genetic code. B) the number of people asking for genetic tests. C) the increasing number of human genes. D) the greatly accelerated speed of DNA sequencing.
Dietary factors are now being studied for how they regulate gene activity and how this contributes to disease. For example, how does a diet high in unsaturated fatty acids help maintain a healthy blood lipid profile? Within hours of feeding animals with
diets rich in polyunsaturated fatty acids (PUFAs), there is an increase in the activity of genes responsible for making enzymes that break down fats and a reduction of the activity of genes responsible for making enzymes that make fats. This has the effect of changing fat metabolism, which leads to a lowering of blood lipid levels. The control of what type of DNA sequence would PUFAs most likely be affecting? A) exon sequences B) intron sequences C) enhancer sequences D) micro-RNA sequences
Water fleas, Daphnia magna, can switch between asexual and sexual reproduction cy-cles. Which of the following observations support(s) the hypothesis that sex is favored in unpredictable environments?
a. The introduction of predators triggers sexual reproduction. b. Daphnia reproduces asexually every other generation in a variety of habi-tats. c. Daphnia reproduces sexually when its aquatic habitat dries up. d. Asexual D. magna strains outcompete introduced competitors. e. A and C.