bio exam 2 icas 2024/2025 with 100% correct answers
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Bio ex2 icas
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Bio Ex2 Icas
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 l...
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. correct answersc
2) The first organic molecule(s) before life started on earth was/were most likely to be
A) polypeptides. B) RNA. C) DNA. D) simple organic compounds such as amino acids and sugars. E)
polysaccharides correct answersd
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) Meteor
contain same chemicals as found in living organisms correct answersa
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 correct answersd
5) 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 correct answersc
Which of the following is the correct sequence of evolution of various life forms from the earliest
organism to the latest organism?
I. higher plants II. mammals III. bacteria IV. humans correct answersa
How long ago, modern humans evolved? Enter in millions of years. correct answers
, How long ago, you think our ancestors walked out of Africa? Enter in 1000s of years. correct answers
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 need oxygen. 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. correct answersb
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 correct answersa
In agarose gel electrophoresis, DNA or RNA fragments move towards ___________ end of the gel plate
because of their____________. A) the neutral..... charge B) the anode ..... size C) the cathode ..... charge
D) the anode ..... charge E) the neutral ..... size correct answersd
If you 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 correct answersb
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. correct
answersb?
Arrange the following sequence of procedure in the proper order in this experiment done to determine
proteins present in pea plants during germination. I. load the proteins in polyacrylamide gel
electrophoresis and separate them II. break the cells by grinding them in liquid nitrogen and suspend in a
buffer III. select a suitable tissue to isolate proteins expressed only during germination IV. centrifuge the
broken cells to purify proteins from other molecules
A) I, III, II, IV B) III, II, I, IV C) II, IV, I, III D) III, II, IV, I E) II, IV, III, I correct answersd
What is the size of bacterial cell in microns (m)? correct answers2
size of chicken egg correct answers135mm
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