Density and Cell Behavior Concepts

The video tutorial introduces the concept of density, explaining how it compares mass and volume. It provides a formula for calculating density and demonstrates this with a metal example. The tutorial compares densities of water, ice, and copper, explaining why ice floats. It introduces specific gravity and its calculation. The video also explores biological applications of density, such as gene and population density, and discusses density dependent inhibition in cells, highlighting its role in cancer development.

What two properties does density compare?

• Mass and temperature

• Volume and temperature

• Weight and height

• Mass and volume

What is the density of a metal with a mass of 13.38 grams and a volume of 1.5 milliliters?

• 8.92 grams per milliliter

• 9.00 grams per milliliter

• 7.50 grams per milliliter

• 10.00 grams per milliliter

Which substance has a lower density than water, allowing it to float?

• Iron

• Ice

• Gold

• Copper

What is specific gravity?

• The mass of a sample compared to the mass of water

• The density of a sample compared to the density of water

• The volume of a sample compared to the volume of water

• The weight of an object compared to water

What does gene density refer to?

• The number of genes per million base pairs in DNA

• The number of genes per cell

• The number of genes per organism

• The number of genes per chromosome

How is population density defined?

• The number of individuals per unit of volume

• The number of individuals per unit of area

• The number of individuals per unit of length

• The number of individuals per unit of mass

What is stomata density?

• The number of stomata per unit of length on a stem

• The number of stomata per unit of mass in a leaf

• The number of stomata per unit of volume in a plant

• The number of stomata per unit of area on a leaf

What happens to normal cells when they reach a certain density?

• They shrink

• They continue to grow

• They stop growing

• They die

What characteristic do cancer cells lack that normal cells have?

• Ability to shrink

• Density-dependent inhibition

• Ability to divide

• Ability to grow

What is the result of cancer cells lacking density-dependent inhibition?

• They stop growing

• They grow out of control, forming a tumor

• They die

• They shrink