Introduction to Biology: Homeostasis, Adaptation, and Levels of Organization

Practice flashcards covering homeostasis, body temperature regulation, genetic mutations, cellular structures, and biological levels of organization from Chapter 1 through Chapter 6.

What advantage does a cat's tortoise shell coat provide in an environment with dead leaves?

Its mottled orange and black coat allows it to blend into dead leaves, making it a more successful hunter and less likely to be picked up by a bird of prey.

What is homeostasis?

Homeostasis means steady state, referring to the maintenance of a relatively stable internal environment required for proper biological function.

What is the difference between acidosis and alkalosis?

Acidosis occurs when the blood becomes too acidic, whereas alkalosis occurs when the blood becomes too alkaline or basic.

How does excessive water intake lead to water intoxication?

It introduces too much water into the circulatory system, disrupting the proper concentrations of necessary chemicals in the body.

How do cold-blooded animals like lizards and snakes regulate their body temperature?

They rely on their environment by lying under a heat lamp to warm up or crawling under objects to cool off.

Why do muscle contractions from shivering or jogging cause body temperature to rise?

Muscle contractions produce heat as a byproduct of their physical activity.

Why does sweat cool the body effectively in Colorado but not in South Carolina?

Colorado has dry weather that allows sweat to evaporate and cool the body, whereas South Carolina's high atmospheric moisture prevents sweat from evaporating.

What physical features help polar bears manage their body temperature in cold environments?

They have thick white fur that acts as an insulator and provides camouflage, as well as black skin underneath that absorbs sunlight and heat.

According to the transcript, which animal is noted as having the best insulating coat of any mammal?

The Arctic fox.

What are mutations and how do they affect living organisms?

Mutations are random changes in DNA over time that can be harmful, neutral (such as eye color variations), or beneficial for adapting to environmental changes.

How long is a completely unwound human DNA molecule?

A completely unwound human DNA molecule is about $2\,m$ long, which is a little over $6\,ft$ long.

What are macromolecules and how are they formed?

Macromolecules are large molecules formed by combining smaller units called monomers.

Why do mature human red blood cells lack a nucleus?

They shed their nucleus once mature to stay tiny and flexible, allowing them to fit through capillaries.

What does the term prokaryote literally mean?

Prokaryote literally means before a nucleus.

What is the key structural difference between prokaryotic and eukaryotic cells?

Prokaryotic cells lack a nucleus and other organelles, while eukaryotic cells are larger and contain a nucleus and membrane-bound organelles.

What is the distinction between a biological community and an ecosystem?

A community consists only of the living populations of different species in an area, while an ecosystem includes both the living organisms and the abiotic (nonliving) components like soil and water.

What is the biosphere?

The biosphere consists of all ecosystems on Earth, encompassing all zones of life across land, water, and parts of the atmosphere.