BL1020 Introductory biology midterm
practice Questions With Correct Answers
Which gas began to increase in the atmosphere as a result of photosynthesis by autotrophic
prokaryotes approximately 2.7 billion years ago?
A) hydrogen
B) carbon dioxide
C) methane
D) oxygen - answer✔D) oxygen
From what can pre-cells spontaneously form?
A) ribozymes
B) fatty acids
C) DNA
D) RNA - answer✔B) fatty acids
Recent scientific studies of the impact of microbiota on the amount of fat versus lean body
mass (i.e., body composition) are described in your text. How do those studies illustrate the
importance of microbiota communities in our bodies?
A) The study suggest that mice are an unreliable model organism to use for studies of human
intestinal microbiota and obesity
B) the studies suggest that intestinal microbiota may be involved in regulating our digestive
processes
C) if transferred to lean humans, intestinal microbiota of obese humans will cause obesity
D) if transferred to obese humans, intestinal microbiota in lean humans will cause exaggerated
obesity - answer✔B) the studies suggest that intestinal microbiota may be involved in
regulating our digestive processes
Trichomonas vaginalis is a protozoan that feeds on white blood cells and bacteria living on the
cells lining the female human vagina, thereby creating a common sexually transmitted disease
often known as "trich". The feeding mechanism of this protozoan makes it a ____________.
A) parasite
B) producer
C) autotroph
D) mixotroph - answer✔A) parasite
In the soil, some _________ help to decompose dead organisms and other waste materials,
returning vital chemical elements such as nitrogen to the environment
A) pre-cells
B) protozoans
C) prokaryotes - answer✔C) prokaryotes
Which group of prokaryotes aids digestion in cattle, deer, and other animals that obtain
nutrition from cellulose?
A) dinoflagellates
B) cocci
C) halophiles
D) methanogens - answer✔D) methanogens
Scientists hypothesize that disrupting our __________ communities may increase our
susceptibility to infectious diseases, predispose us to certain cancers, and contribute to
conditions such as asthma and other allergies, irritable bowel syndrome, crohn's disease, and
autism
A) plant
B) pathogen
C) protist
D) microbial - answer✔D) microbial
Why is RNA thought to have been the first genetic material?
A) RNA is capable of self-replication
B) RNA has been found on meteorites
C) RNA is structurally simpler than DNA - answer✔A) RNA is capable of self-replication
In Yellowstone national park, hot springs can reach temperatures of 205F (96C). Despite these
high temperatures, aquifex bacteria flourish. How might one best classify aquifex bacteria?
A) amoebas
B) slime molds
C) algae
D) extremophiles - answer✔D) extremophiles
spherical bacteria that occur in clusters are ________
Which group of organisms colonized land during the Paleozoic era approximately 500 million
years ago?
A) bacteria, plants, and fungi
B) plants, fungi, and insects
C) plants, protists, and insects
D) protists, bacteria, and fungi - answer✔B) plants, fungi, and insects
Eukaryotes arose about ______ years after the first prokaryotes.
A) 1.7 billion
B) 3.5 billion
C) 3.0 billion
D) 4.0 billion - answer✔A) 1.7 billion
Prokaryotes reproduce by the means of _________
A) binary fission
B) budding
C) mitosis
D) meiosis - answer✔A) binary fission
Which statement is FALSE?
A) the great diversification of animals occurred during the Cambrian explosion
B) the first organisms to colonize land were animals
C) the evolution of multicellularity took place after the origin of the eukaryotes
D) for most of biological history, life was confided to aquatic habitats - answer✔B) the first
organisms to colonize land were animals
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