Biology (BIOL1002) Chapter 28

Which of the following statements best characterizes the impact of protists on human health?

Some protists are parasites that cause serious human disease

What is plankton?

Swimming or floating protists, bacteria, viruses, and small animals

A group of protists uses flagella to navigate their aquatic environments.

These protists are known as flagellates

In order to move from one place to another, ciliates use _______ and amoebozoa use, _______________ which are specialized structures associated with their type of motility.

cilia; pseudopodia

Protists that move through their aquatic environment by means of cilia are known as

ciliates

Algae, protozoa, and fungus-like are informal labels that refer to the __________ roles filled by protists.

ecological

Protists can be grouped into three types according to the ______________ roles they fulfill within their environments.

ecological

When we informally group protists according to whether they are autotrophs or heterotrophs, and whether they produce or consume oxygen, we are referring to their:

ecological role

The term protist comes from a Greek word that reflects the observation that these organisms were Earth's first

eukaryotes

Sedentary protists utilize their flagella for:

feeding, dispersal of gametes

Plankton, phytoplankton, and periphyton are informal groupings of protists classified according to:

habitat

Protozoa are:

heterotrophs

In one informal classification scheme, protists are grouped according to possession of morphological structures used for:

locomotion

Flagella are cellular extensions whose movement is controlled by interactions between ______________ and the motor protein dynein

microtubules

Algae are typically capable of photosynthesis. However, they do not form a(n) _______________ group descended from a single common ancestor.

monophyletic

Plankton are a group of floating aquatic organisms that may include

protists, bacteria, viruses, and small animals

Heterotrophic protists that feed by absorbing small molecules or ingesting food particles are classified into a broad group called

protozoa

Amoebae are protist cells that move using structures called

pseudopodia

Protists can be informally classified as algae, protozoa, or fungus-like protists according to the ecological roles they fulfill in their environments, that is, according to:

the method they use to obtain organic compounds

____________ are short, abundant, hairlike extensions on the surfaces of some protist cells that aid in locomotion.

Cilia

Which of the following are structures that protists utilize to swim?

Cilia, Flagella

Protists are

Eukaryotes

____________ are usually composed of one or a few cells and are small because their appendage motion is not powerful enough to keep larger bodies from sinking.

Flagellates

Protists have evolved diverse ways for locomotion.

For example swimming can occur by means of appendages called flagella and cilia

Which of the following are ecological roles filled by protists?

Fungus-like, Algae, Protozoa

Which of the following are provided to heterotrophs by photosynthetic algae?

Oxygen and Organic compounds

Which of the following are informal groups of protists classified according to habitat?

Plankton, Periphyton

Select all of the following that are impacts of protists on global ecology.

Protists produce at least half of the oxygen in the Earth's atmosphere; Protists cause serious diseases, such as malaria; Algae are being used in biofuel production.

Flagella use what type of motion to push or pull eukaryotic cells through water?

Rapid bending and straightening

Algae are _______ protists.

photoautotrophic

Most algae are protists that can produce organic compounds by means of

photosynthesis