Chromosomes, Genes, and DNA

Which of the following defines a codon? A. A triplet of bases that codes for an amino acid B. A triplet of amino acids that codes for a base C. A triplet of genes that code for a protein D. A tRNA with an amino acid hooked to it.

A. A triplet of bases that codes for an amino acid

Which of the following best describes the packaging of DNA in a cell from the smallest unit to the largest? A. nucleotides--DNA--chromosomes--genome B. DNA--genes--chromosomes--genome C. genes--chromosomes--DNA--genome D. genome--chromosomes--DNA--nucleotides

A. nucleotides--DNA--chromosomes--genome

What does DNA>RNA>Protein mean? A. The complementary strand of bases in a gene is used to make a template strand called mRNA, which is read by ribosome to make a chain of amino acids that folds into a protein. B. 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. C. 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. D. 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.

B. 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.

A chromatid is _________. Which of the following completes the sentence? A. a pair of duplicated chromosomes. B. a duplicate in a chromosome pair. C. one of 46 molecules of DNA found in a cell nucleus. D. a complementary strand.

B. a duplicate in a chromosome pair.

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

B. cytosine, thymine, adenine, guanine

Which of the following statements correctly describes a gene? 1. A gene is a unit of heredity. 2. A gene codes for a protein or functional RNA molecule. 3. A gene is equivalent to a chromosome. A. 1,2,3 B. 1 and 3 C. 1 and 2 D. 2 and 3

C. 1 and 2

Which of the following statements best describes the DNA double helix? A. A twisted ladder with sugars facing each other as the rungs and phosphates and bases forming the sides of the ladder. B. A twisted ladder with phosphate facing each other as the rungs and the sugars and bases forming the sides of the ladder. C. A twisted ladder with bases facing each other as the rungs and the phosphates sugars forming the sides of the ladder. D. An extension ladder with sugars facing each other as the rungs and the phosphates and bases forming the sides of the ladder.

C. A twisted ladder with bases facing each other as the rungs and the phosphates sugars forming the sides of the ladder.

Chromosomes are replicated ________. Which of the following completes the sentence above? A. during the genetic code. B. in mitosis. C. in a phase of the cell cycle. D. by ribosomes.

C. in a phase of the cell cycle.

Which of the following comparison is not correct? A. Codons are like words. B. Nucleotides are like letters. C. Genes are like sentences. D. Genes are like words.

D. Genes are like words.

Where is most of the DNA found in a human neuron? A. Mitochondria B. Cell C. Ribosome D. Nucleus

D. Nucleus