4 Written questions
3 Multiple choice questions
- "tinkering" with existing structures
- RNA has both information storage and catalytic properties.
- 4.5 billion years ago ... 3.9 billion years ago
3 True/False questions
Hox genes are thought to play an important role in the development of different morphologies because _____.
they affect the timing of reproductive development in the organism
they paved the way for the development of multicellular organisms
they affect the order of genes on certain chromosomes
they affect the timing of development in the embryo
they provide positional information in the embryo → they provide positional information in the embryo
Radiometric dating _____.
allows us to determine an absolute, errorless date
only works on rocks younger than 75,000 years
allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata
relies on the fact that the daughter isotope decays to the parent isotope at a constant rate
can be used to directly date fossils in sedimentary rock → allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata
Which of these are homologous structures?
There are no homologous plant structures.
Ivy leaf and pine needle
Plant root and plant leaf → "tinkering" with existing structures