DNA And GENES Question Preview (ID: 16550)
What Is The Structure And Function Of DNA?
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What letters represent the four nitrogenous bases?
a) A, T, G, and C
b) G, T, A, and D
c) U, T, G, and C
d) A, T, G, and X
Watson and Crick build a model of DNA that looked like a ________________________.
a) twisted ladder
b) single helix
c) double pyramid
d) straight line
To be copied, DNA molecules splits ________________________.
a) down the middle
b) along the phosphates
c) along the sugars
d) one pair of bases only
The sides of DNA's ladder structure are made of _____________________ and _____________________.
a) sugars and phosphates
b) sugars and phospholipids
c) adenine and thymine
d) phosphates and bases
The rungs of the ladder structure of DNA are made of _________________________.
a) a pair of bases
b) a pair of sugars
c) a pair of phosphates
d) a set of proteins
A string of nucleotides that code for a specific trait is called a _________________________.
a) gene
b) chromosome
c) cell
d) nucleus
DNA stands for _______________________.
a) deoxyribonucleic acid
b) deoxyribosome adenine
c) donuts rot always
d) tRNA
DNA is made of subunits called ______________________.
a) nucleotides
b) proteins
c) gene
d) amino acids
Nucleotides are made of _______________________.
a) a phosphate, a sugar, and a base
b) a phosphate, a protein, and two bases
c) a phosphate, a sugar, and a ribosome
d) a ribosome, a sugar, and two bases
The amount of adenine in DNA always equals the amount of _________________.
a) thymine
b) guanine
c) cytosine
d) all of the answers are correct
Guanine always pairs with which nitrogenous base?
a) cytosine
b) adenine
c) thymine
d) any base
The complementary strand for the DNA sequence TAGTCA is?
a) ATCAGT
b) TAGGCT
c) GACAGT
d) ATCACT
Pairs of bases match up because they are ______________________ to one another.
a) complementary
b) opposite
c) the same
d) replicates
DNA must _____________________ before a cell divides.
a) replicate
b) mutate
c) phosphate
d) eliminate
DNA can be wound so tightly that it fits in a(n) ______________________ inside the nucleus of a eukaryotic cell.
a) chromosome
b) nucleotide
c) gene
d) ribosome
If one nucleotide base is changed in a strand of DNA then this is called a ______________________________.
a) mutation
b) chromosome pair
c) complementary strand
d) DNA fingerprint
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