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BIO 311C EXAM 2 QUESTIONS AND ANSWERS A+ GRADED
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BIO 311C EXAM 2 QUESTIONS AND ANSWERS A+ GRADED How did life originate on earth? A)Life started with meteors from space brought extra terrestrial life from which later evolved. B)Life existed on earth from the beginning and we do not know where it came from C)Simple chemicals combined...

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  • November 12, 2024
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  • 2024/2025
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BIO 311C EXAM 2 QUESTIONS AND ANSWERS A+ GRADED

How did life originate on earth?

A)Life started with meteors from space brought extra terrestrial life from which
later evolved.

B)Life existed on earth from the beginning and we do not know where it came
from

C)Simple chemicals combined during early stages of earth and evolved into
ancestral life form.

D)Superhuman powers created life as they exist now and their diversity

E) Aliens brought some simple life forms several million years ago and allowed it
to evolve.
C)Simple chemicals combined during early stages of earth and evolved into ancestral
life form.
What are the evidences for evolution?
fossils
What was the major conclusion from the Urey and Miller experiment?

A)Life can be formed from simple chemicals

B)Organic molecules come from living organisms only

C)Polymers can be formed from monomers

D)Simple atoms and molecules can form monomers of biological molecules

E)Meteors contain same chemicals as found in living organisms
Simple atoms and molecules can form monomers of biological molecules
Which of the following is the correct sequence of events in the origin of life?

I. Synthesis of organic monomers
II. Formation of prebiotic structures
III. Synthesis of organic polymers
IV. Formation of reproducible cells


A) III, II, I, IV
B) I, II, IV, III
C) IV, III, I, II

,D) I, III, II, IV
E) II, III, I , IV
D) I, III, II, IV
Why was RNA considered to be the first genetic material formed even before
DNA?


A) It was widely found on primitive earth

B) it can serve as monomers for protein synthesis

C) it can store information and act as a enzyme to catalyze reactions.

D) it was stable and double stranded to avoid degradation.

E) it was made of deoxyribonucleotides.
C) it can store information and act as a enzyme to catalyze reactions.
How long ago, modern humans evolved? Enter in millions of years.
.2
What conditions on early stages of earth were conducive for life to form?
reducing conditions, Low O2 levels, optimal temperature, H2O Availability
The "cell theory," in its modern form includes all of the following postulates
except __________________


A) All organisms are composed of one or more cells.

B) All cells contain nucleus

C) Cells are the smallest living things.

D) Cells arise only by division of a previously existing cell.

E) Cell is the unit of life.
B) All cells contain nucleus

Not necessarily; some cells can be anaerobic or facultatively aerobic based on oxygen
levels in the environment. They can survive through glycolysis to form ATP.
You would be wasting your time if you were trying to use a light microscope to
see_______


A) ribosomes

B) animal cells

, C) bacteria

D) yeast cells

E) potato cells
A) ribosomes

The other choices are composed of many different monomers and are highly complex.
The ribosome resides inside cells and is much smaller than what can be visualized in a
light microscope.
If you'd like to view the cross section of a mitochondrion, you most likely would
use_____________


A) a light microscope.

B) a transmission electron microscope.

C) a scanning electron microscope.

D) agarose gel electrophoresis

E) a magnifying glass
B) a transmission electron microscope.

Transmission electron microscopes show the structure of whatever is being studied.
What could be a main objective of cell fractionation by centrifugation?


A) to crack the cell wall of plant cells.

B) to separate the components by their weight or density.

C) to identify the enzyme 3-D structure

D) to determine the charges of various proteins

E) to view the structure of cell membranes.
B) to separate the components by their weight or density.

Centrifugation is spinning a solution with cellular components at very high speeds to
separate the molecules by density. The less dense stay at the top, more dense at the
bottom.
Arrange the following sequence of procedure in the proper order in this
experiment done to determine proteins present in pea plants during germination.

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