Chapter 1 review questions
a scientific experiment includes a component that rules out alternative explanations of the results by showing that the only feature that varied in the experiments as the characteristic being tested. The component that does this is called
Control
like plants, some microorganisms __
are photosynthetic and produce oxygen
unlike other organisms, most ___ have cell walls that contain peptidoglycan
bacteria
which microorganisms lack a membrane bound nucleus
bacteria and archaea
which of the following is a difference between archaea and bacteria?
bacteria possess peptidoglycan in their cell walls whereas archaea do not
which of the following describes a viroid?
can infect plants, consists of RNA
Which of the following are produced metabolically by microorganisms?
cellulose used in stereo headsets, ethanol as a biofuel and antibiotics
archaea are commonly found in which roles or environments/
hot springs, soils, oceans, extremely salty water such as the Great Salt Lake and Dead Sea
all of the following are commonly found in algae except
peptidoglycan
Characteristics of archaea that are similar to bacteria include their:
prokaryotic cell structure, method of multiplication, shapes, energy used
if cattle, sheep and deer had a microbe free digestive tract they would
starve
When an extensive amount of experimental evidence supports a hypothesis, the explanation may become a scientific
theory
What are classified as acellular infectious agents?
viroids, viruses and prions
which of the following are manufactured by microbial fermentation
yogurt, cheese and beer
Which of the following best describes the cultivation of microorganisms in the lab
less than1% of microorganisms can be cultivated
organisms that populate the human body and which protect it from disease are termed normal
microbiota
Which of the following are characteristics of protozoa?
microscopic and single celled eukaryotes
Which of the following characteristics describe protozoa?
most are motile, can be found in terrestrial and aquatic habitats
A ___ is the term used for any disease causing microorganism
pathogen
algae and protozoa are also referred to as
protists
which of the following can be infected by viruses?
protists, fungi, animals, bacteria, plants
As important decomposer, fungi obtain nutrients by
secreting enzymes to degrade organic material in the environment
algae are
single / multicellular photosynthetic eukaryotes
John Tyndall's experiments in the 1800s showed that live microorganisms remained in some broths even after they had been boiled for 5 hours. This observation can be explained by the presence of heat resistant form of bacteria called an
endospore
