Answer:
Darwin's Natural Selection Worksheet Read the following situations and fill in the chart for each of the four parts of Darwin's theory of
natural selection.
D There is a species of worms that eat at night (nocturnal) and ones that eat during the
day (diurnal). The birds eat during the day and seem to be eating ONLY the diurnal
worms. The nocturnal worms are in their burrows during this time. Each spring when
the worms reproduce, they have about 500 babies but only 100 of these 500 ever
become old enough to reproduce.
Overproduction:
Genetic Variation:
Selection:
Adaptation:
Explanation:
Answer:
B) Telomerase is a ribonuclear protein containing a section of RNA complementary to the telomeres
C. telomerase is reactivated in cancer cells, contributing to their immortality
Explanation:
- Telomerase elongates telomere ends
- Telomerase binds to a RNA molecule containing a sequence complementary to the telomeric repeat.
- Telomerase is usually not active in somatic cells but is active in cancer cells- the protein acts to extend the shortened telomeres in these cells preventing them from dying
