After chromosomes are formed, during which phase of mitosis do the chromosomes attach to the spindle fibers by their centromeres?
1. anaphase
2. prophase
3. metaphase
4. telophase

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?