Portage Learning
Nutrition BIOD12
2025/2026
Exam Prep Material
with
Verified Questions and Answers
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, Adenine
Guanine
Nitrogenous bases of DNA Thymine
Cytosine
Contain 2 carbon-nitrogen rings, and Purines - A and G
4 nitrogen atoms
Contain 1 carbon-nitrogen ring, and Pyramidines - T and C
2 nitrogen atoms
Deoxyribose sugar chemically linked to each base in DNA
Nucleoside base + deoxyribose
Nucleotide base + deoxyribose + phosphate group
purine always pairs with pyramidine
complementary pairs (T+A), (C+G)
Hydrogen bonds
Occur when 2 negatively charged
atoms share a hydrogen atom
# of hydrogen bonds between A and two
T
# of hydrogen bonds between C and three
G
specified linear arrangement of nucleotides linked to the polynucleotide
sequence chains of DNA. Defines the entire organism
end terminating with a phosphate 5' (five prime) end
group
end terminating with a hydroxyl 3' (three prime) end
group
one side of the helix runs in the opposite (5'-3') direction of the other
antiparallel arrangement (3'-5)
Genome entire sequence of paired bases in DNA
A simple protein bound to DNA, involved in the coiling of chromosomes
histone proteins
Chromatin DNA sequences and their associated proteins
Chromosomes structures of packaged chromatin complexes
Somatic cell All of the body's cells except gametes
Number of chromosomes in each 46 (23 pairs)
somatic cell
Nutrition BIOD12
2025/2026
Exam Prep Material
with
Verified Questions and Answers
A+ Grades Guarantee
, Adenine
Guanine
Nitrogenous bases of DNA Thymine
Cytosine
Contain 2 carbon-nitrogen rings, and Purines - A and G
4 nitrogen atoms
Contain 1 carbon-nitrogen ring, and Pyramidines - T and C
2 nitrogen atoms
Deoxyribose sugar chemically linked to each base in DNA
Nucleoside base + deoxyribose
Nucleotide base + deoxyribose + phosphate group
purine always pairs with pyramidine
complementary pairs (T+A), (C+G)
Hydrogen bonds
Occur when 2 negatively charged
atoms share a hydrogen atom
# of hydrogen bonds between A and two
T
# of hydrogen bonds between C and three
G
specified linear arrangement of nucleotides linked to the polynucleotide
sequence chains of DNA. Defines the entire organism
end terminating with a phosphate 5' (five prime) end
group
end terminating with a hydroxyl 3' (three prime) end
group
one side of the helix runs in the opposite (5'-3') direction of the other
antiparallel arrangement (3'-5)
Genome entire sequence of paired bases in DNA
A simple protein bound to DNA, involved in the coiling of chromosomes
histone proteins
Chromatin DNA sequences and their associated proteins
Chromosomes structures of packaged chromatin complexes
Somatic cell All of the body's cells except gametes
Number of chromosomes in each 46 (23 pairs)
somatic cell
