WorksheetsDNA Structure & Function
Total questions: 30
Worksheet time: 15mins
DNA stands for
double nitrogen acid
ribonucleic acid
deoxynitrogenous acid
deoxyribonucleic acid
DNA is composed of subunits called ___, linked together to form long chains.
nitrogenous bases
nucleotides
hydrogen bonds
phosphate groups
Each nucleotide consists of ___.
deoxyribose
a phosphate group
a nitrogenous base
all of these
In DNA, which of the following always pairs with adenine?
adenine
thymine
cytosine
guanine
What type of bonds hold the nitrogen bases together in a DNA molecule?
carbon bonds
hydrogen bonds
nitrogen bonds
sulfur bonds
The sugar in DNA is ___.
ribose
deoxyribose
glucose
sucrose
The process of making two identical copies of DNA from one original is classed ___.
DNA replication
RNA replication
DNA reproduction
DNA transcription
The enzyme ___ adds free nucleotides to the original nucleotides during replication.
helicase
polyase
polymerase
helium
What would be the complement for the following base sequence: AGATCT?
CTCAGA
TCTAGA
GAGCTC
CTCGAG
Watson and Crick discovered ___.
the shape of DNA as a double helix
human DNA is composed of billions of base pairs
DNA carries genetic information
that DNA replication is semi-conservative
The sides of a DNA molecule are made of ___.
adenine and thymine
deoxyribose sugar and phosphate
cytosine and guanine
nitrogenous bases
The function of DNA is to ___.
make proteins
transfer the genetic information to ribosomes
carry the code for genetic information
make sugars
When DNA repicates, each new strand has half of the original nucleotides, making it ___.
conservative
anti-conservative
semi-conservative
semi-complementary
The steps or "rungs" of the DNA molecule are made of ___.
deoxyribose and phosphate
hydrogen and phosphate
nitrogenous bases
ribose and deoxyribose
Chromosomes are composed of DNA.
True
False
An organism's traits are determined by the sequence of bases along certain proportions of DNA.
True
False
What happens right after a DNA molecule is unzipped?
Mismatched nucleotide bases are identified and replaced
Free-floating nucleotides pair up with exposed bases
Identical double-stranded DNA molecules are formed
Enzymes break hydrogen bonds between base pairs
The attachment of nucleotides to form complementary strand of DNA during replication ___.
is accomplished by DNA polymerase.
is the responsibility of the proofreading molecules.
is accomplished only in the presence of tRNA.
prevents separation of complementary strands of RNA.
When new DNA molecules are formed, almost all errors are detected and fixed by ___.
the correct nucleotide.
the sugar-phosphate backbone.
DNA polymerase.
one DNA strand.
___ is the organelle that helps form proteins.
guanine
ribosome
mitochondria
nucleus
What enzyme helps form mRNA?
RNA polymerase
DNA polymerase
uracil
DNA
___ is the sugar that forms the backbone of the RNA molecule.
fructose
glucose
deoxyribose
ribose
RNA is ___ stranded.
single
double
triple
Transcribe the DNA segment into mRNA: AGC TAG
UCG AUC
UCG TAC
TCG ATC
A ___ RNA brings the amino acid to the ribosome to match with a codon.
ribosomal
messenger
transfer
DNA is ___ stranded.
single
double
triple
___ RNA makes up ribosomes and aids bonding amino acids for protein synthesis.
Ribosomal
Transfer
Messenger
DNA has the nitrogenous base ___.
guanine
uracil
___ RNA has codons
RIbosomal
Transfer
Messenger
RNA has the nitrogenous base ___.
thymine
uracil
