Exam 15: Evolution and Diversity of Microbial Life

Dictyostelium discoideum straddles the boundary between unicellular and multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria.When the food runs out,cells begin to aggregate into a multicelled structure.The cells differentiate into a base,stalk,and spores;only the spores survive to colonize a new habitat.Dictyostelium discoideum is which of the following?

Eukaryotes probably originated about

In fungi,a mass of aggregated hyphae is called a(n)

The first life on Earth was

Dictyostelium discoideum straddles the boundary between unicellular and multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria.When the food runs out,cells begin to aggregate into a multicelled structure.The cells differentiate into a base,stalk,and spores;only the spores survive to colonize a new habitat.What is the advantage of forming spores?

After a haploid spore germinates,it then completes mitosis,forming hyphae.The resulting hyphae are

The three most common shapes of bacteria are

Fungi that do not reproduce sexually and have large asexual spores are

Which protists produce much of the Earth's oxygen?

A dinoflagellate has two flagella.

What did Stanley Miller's simulation of Earth's early conditions produce?

Protists can be heterotrophs.

The structure that aids in locomotion of some bacteria is a

Where in a diatom would you find its yellowish photosynthetic pigment?

A mushroom is a dikaryotic structure of Basidiomycota.

Photosynthesis probably originated during the __________ eon and most likely used _____________ as an electron donor.

All protists are single-celled.