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Teas Test > Genetic Material And The Structure Of Proteins 2.2 > Flashcards

Genetic Material And The Structure Of Proteins 2.2 Flashcards

1
Q

Which of the following statements best describes the DNA double helix?

A twisted ladder with sugars facing each other as the rungs while the phosphates and bases form the sides of the ladder

A twisted ladder with phosphates facing each other as the rungs while the sugars and bases form the sides of the ladder

A twisted ladder with bases facing each other as the rungs while the phosphates and sugars form the sides of the ladder

An extension ladder with sugars facing each other as the rungs while the phosphates and bases form the sides of the ladder

A

A twisted ladder with bases facing each other as the rungs while the phosphates and sugars form the sides of the ladder

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2
Q

Which of the following is where most of the DNA is found in a human cell?

Mitochondria
Centrioles
Ribosome
Nucleus

A

Nucleus

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3
Q

Which of the following statements correctly describes a gene?
A gene is a unit of heredity.
A gene codes for a protein or functional RNA molecule.
A gene is equivalent to a chromosome.

A
Statements 1, 2, and 3

B Statements 1 and 3

C Statements 1 and 2

D
Statements 2 and 3

A

C Statements 1 and 2

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4
Q

Which of the following statements describes transcription and translation?

The complementary strand of bases in a gene is used to make a template strand called mRNA, which is read by a ribosome to make a chain of amino acids that folds into a protein.

The sequence of bases in a gene is used to make an mRNA copy, which is read by a ribosome to make a chain of amino acids that folds into a protein.

The sequence of bases in a gene is used to make an rRNA copy, which becomes part of a ribosome where it makes a chain of amino acids that fold into a protein.

The sequence of amino acids in a gene is used to make an mRNA copy, which is read by a ribosome to make a chain of bases that fold into a protein.

A

The sequence of bases in a gene is used to make an mRNA copy, which is read by a ribosome to make a chain of amino acids that folds into a protein.

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5
Q

Chromosomes are replicated ______
Which of the following completes the sentence above?

during the genetic code.
in mitosis.
in a phase of the cell cycle.
by ribosomes.

A

in a phase of the cell cycle.

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6
Q

Which of the following are the four nitrogenous bases found in DNA?

A Adenine, thymidine, cysteine, guanine
B Cytosine, thymine, adenine, guanine
C Adenoid, cytosine, thymine, guano
D Cytosine, uracil, guanine, thymine

A

B Cytosine, thymine, adenine, guanine

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7
Q

Which of the following best describes the packaging of DNA in a cell from the smallest unit to the largest?

nucleotides, DNA, chromosomes, genome

DNA, genes, chromosomes, genome

genes, chromosomes, DNA, genome

genome, chromosomes, DNA, nucleotides

A

nucleotides, DNA, chromosomes, genome

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8
Q

Which of the following comparisons is not correct?

Codons are like words.
Nucleotides are like letters.
Genes are like sentences.
Genes are like words.

A

Genes are like sentences.

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9
Q

Which of the following defines a codon?

A triplet of bases that code for an amino acid
A triplet of amino acids that code for a base
A triplet of genes that code for a protein
A tRNA with an amino acid hooked to it

A

A triplet of bases that code for an amino acid

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10
Q

A chromatid is _______
Which of the following completes the sentence above?

a pair of duplicated chromosomes.
a duplicate in a chromosome pair.
one of 46 molecules of DNA found in a cell nucleus.
a complementary strand.

A

a duplicate in a chromosome pair.

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11
Q

Which of the following nucleotides pairs with adenine in
DNA?

A Guanine
B. Adenine
C. Cytosine
D. Thymine

A

Thymine

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12
Q
  1. Which of the following is the number of chromosomes found in a human cell?
    A. 1 circular chromosome
    B. 22 (11 pairs)
    C. 46 (23 pairs)
    D. 50 (25 pairs)
A

46 (23 pairs)

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13
Q
  1. Which of the following statements about nucleotides and genes is correct?
    A. A gene contains thousands of chromosomes.
    B. A nucleotide contains many genes and chromosomes.
    C Nucleotides form strings of DNA that make up genes.
    D. Nucleotides form strings of chromosomes that make up DNA.
A

Nucleotides form strings of DNA that make up genes

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14
Q
  1. Which of the following is the name for a segment of DNA that codes for a protein?
    A. Nucleotide
    B Gene
    C. Chromosome
    D. DNA
A

Gene

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