Lab: Dichotomous Keys — Unit test Answers

Which list contains only animal phyla?

During a long drought, many deer become weak because a basic need is not being met.What requirements for life are the deer most likely lacking?

Most organisms breathe using oxygen or carbon dioxide. Where do these gases come from on land?

What do scientists call all of the compounds that contain carbon and are found in living things?

Which accurately represents these building blocks of matter from the smallest to the largest?

A certain organic compound is made up of the amino acids methionine, arginine, and leucine. Which type of organic compound is this?

What are the three domains of the modern classification system?

Look at the diagram of Woese’s modern system of classification.

Read this description of the life cycle of a mushroom.1. A mushroom begins to grow underground as a single-celled "spore.”2. The spore grows into multicellular structures called "hyphae.”3. The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground.4. The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again.

Plant cells undergo a process called photosynthesis, which uses sunlight to make sugar. Which need does photosynthesis fulfill for plants?

Four students are trying to summarize how scientists classify organisms, and are discussing whose answer is best. This chart shows the four students’ attempts.