Term
Chromosome structure can be altered by a _____ .
a. deletion
b. duplication
c. inversion
d. translocation
e. all of the above |
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| Nondisjuction can be caused by _____ . |
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Definition
| failure of chromosomes to separate during meiosis |
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A gamete affected by nondisjuction would have _____ .
a. a change from the normal chromosome number
b. one extra or one missing chromosome
c. the potential for a genetic disorder
d. all of the above |
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| Amniocentesis involves sampling ____ |
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Definition
| the fetal cells floating in the amniotic fluid |
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| The condition occurring when an organism has a 2n + 1 chromosome composition is known as |
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Definition
| as the age of the mother increases, the chance of the defect occurring in the unborn children increases |
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| The sex chromosome composition of a person with Turner syndrome is ___ |
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| The significance of the experiments in which 32P and 35S were used is that ___ |
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Definition
| it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria |
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Definition
| found in proteins but not nucleic acids |
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Term
Which is not a nucleotide base in DNA?
a. adenine
b. guanine
c. uracil
d. thymine
e. cytosine |
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Term
James Watson and Francis Crick
a. established the double-stranded nature of DNA.
b. established the principle of base pairing.
c. explained how DNA's structure permitted it to be replicated.
d. proposed the concept of the double-helix.
e. all of these |
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Term
| What are the base-pairing rules for DNA? |
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Definition
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Term
In the pairing of two nucleotides within the double helix
a. hydrogen bonds are used.
b. adenine and thymine bind together.
c. purines bind with pyrimidines.
d. double-ring nitrogenous bases connect to single-ring bases.
e. all of these |
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Definition
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Term
From X-ray diffraction data, which of the following was determined about DNA?
a. The molecule had uniform diameter.
b. The molecule was long and narrow.
c. Part of the molecule repeated itself often.
d. The shape of the molecule could be spiral.
e. all of these |
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Definition
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Term
| In the bonding of nitrogenous bases ___ |
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Definition
| guanine is paired with cytosine |
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Term
| Each DNA strand has a backbone that consists of alternating ____ |
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Definition
| sugar and phosphate molecules |
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Term
| A DNA strand having the sequence C-G-A-T-T-G would be complementary to the sequence ___ |
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Term
| One species' DNA differs from others in its _____. |
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Definition
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Term
| When DNA replication begins, _____. |
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Definition
| the two DNA strands unwind from each other |
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Term
NA replication requires
a. free nucleotides
b. new hydrogen bonds
c. many enzymes
d. all of the above |
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Term
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Definition
| produces two molecules, each of which is half-new and half-old DNA joined lengthwise to each other |
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Term
| The DNA molecule is usually made up of how many strands? |
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| The appropriate adjective to describe DNA replication is ___ |
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| DNA contains many different genes that are transcribed into different _____ . |
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| Which of the following carries amino acids to ribosomes, where amino acids are linked into the primary structure of a polypeptide? |
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| The nitrogenous base found in DNA but not in RNA is ___ |
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| The synthesis of an RNA molecule from a DNA template strand is ___ |
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Definition
| occurs during the synthesis of any type of RNA from a DNA template |
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| The portion of the DNA molecule that is translated is composed of ___ |
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| An RNA molecule is _____. |
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| An mRNA molecule is produced by _____. |
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Term
| There are how many different kinds of RNA codons? |
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Definition
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| The concept that a set of three nucleotides specifies a particular amino acid provides the basis for ____ |
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