20. Development

What is apoptosis?

a. An experimental technique used to kill specific cells

b. Programmed cell death that is required for normal development

c. A pathological condition observed only in damaged or diseased organisms

d. A developmental mechanism unique to the roundworm C. elegans

Which of the following occurs when a covalent bond forms?

a. Electrons in valence shells are transferred from one atom to another.

b. Electrons in valence shells are shared between atoms.

c. Partial charges on polar molecules interact.

d. Nonpolar molecules are pushed together.by surrounding water molecules.

In adult animals, ___________ are a source of undifferentiated cells that can divide to produce cells that can specialize.

What does it mean to say that a characteristic is heritable?

a. The characteristic evolves.

b. The characteristic can be passed on to offspring.

c. The characteristic is advantageous to the organism.

d. The characteristic does not vary in the population.