BIOD 101 Module 4 Exam Portage learning Questions with
Verified Answers 2025 Update
Nitrogenous bases of DNA - Adenine
Guanine
Thymine
Cytosine
Contain 2 carbon-nitrogen rings, and 4 nitrogen atoms - Purines - A and G
Contain 1 carbon-nitrogen ring, and 2 nitrogen atoms - Pyramidines - T and C
Deoxyribose - sugar chemically linked to each base in DNA
Nucleoside
- base
+ deoxyribose
Nucleotide - base + deoxyribose + phosphate
group
complementary pairs - purine always pairs with pyramidine
(T+A), (C+G)
Occur when 2 negatively charged atoms share a hydrogen atom - Hydrogen bonds
# of hydrogen bonds between A and T - two
#
of
hydrogen
bonds between
C and G
- three
sequence - specified linear arrangement of nucleotides linked to the polynucleotide chains of
DNA. Defines the entire organism
end terminating with a phosphate group - 5' (five prime) end
end terminating with a hydroxyl group - 3' (three prime) end
antiparallel arrangement - one side of the helix runs in the opposite (5'-3') direction of the
other (3'-5)
Genome - entire sequence
of
paired bases in DNA
histone proteins - A simple protein bound to DNA, involved in the coiling of chromosomes
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 somatic cell
- 46
(23 pairs)
Cell cycle - Process of parent cell replicating its genetic info and dividing into 2 new
daughter cells
