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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 03: Biological Macromolecules
3.1 Synthesis of Biological Macromolecules
3.2 Carbohydrates
3.3 Lipids
3.4 Proteins
3.5 Nucleic Acids
Download MCQ Quiz PDF eBook
Question: Saturated fats have all of the following characteristics except:
Choices:
they are solid at room temperature
they have single bonds within the carbon chain
they are usually obtained from animal sources
they tend to dissolve in water easily
Question: Dehydration synthesis leads to formation of
Choices:
monomers
polymers
water and polymers
none of the above
Question: An example of a monosaccharide is ________.
Choices:
fructose
glucose
galactose
all of the above
Question: A nucleotide of DNA may contain ________.
Choices:
ribose, uracil, and a phosphate group
deoxyribose, uracil, and a phosphate group
deoxyribose, thymine, and a phosphate group
ribose, thymine, and a phosphate group
Question: The a helix and the ß-pleated sheet are part of which protein structure?
Choices:
primary
secondary
tertiary
quaternary
Question: Plant cell walls contain which of the following in abundance?
Choices:
starch
cellulose
glycogen
lactose
Question: During the breakdown of polymers, which of the following reactions takes place?
Choices:
hydrolysis
dehydration
condensation
covalent bond
Question: Cellulose and starch are examples of:
Choices:
monosaccharides
disaccharides
lipids
polysaccharides
Question: Phospholipids are important components of ________.
Choices:
the plasma membrane of animal cells
the ring structure of steroids
the waxy covering on leaves
the double bond in hydrocarbon chains
Question: The monomers that make up proteins are called ________.
Choices:
nucleotides
disaccharides
amino acids
chaperones
Question: Lactose is a disaccharide formed by the formation of a ________ bond between glucose and ________.
Choices:
glycosidic; lactose
glycosidic; galactose
hydrogen; sucrose
hydrogen; fructose
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