Chromosomes Genes DNA Test
Which of the following statements best describes the DNA double helix?
A twisted ladder with sugars facing each other as the rungs and the phosphates and bases forming the sides of the ladder No - The bases face inward and form the rungs. The sugars and phosphates form the sides of the ladder. A twisted ladder with phosphates facing each other as the rungs and the sugars and bases forming the sides of the ladder. No - The bases face inward and form the rungs. The sugars and phosphates form the sides of the ladder. A twisted ladder with bases facing each other as the rungs and the phosphates and sugars forming the sides of the ladder. Yes - The double helix is like a twisted ladder with it sugar-phosphate backbone forming the sides of the ladder and the nitrogenous bases forming the rungs. An extension ladder with sugars facing each other as the rungs of and the phosphates and bases forming the sides of the ladder. No - The DNA double helix looks like a ladder twisted around its central axis, not a long straight ladder.
Where is most of the DNA found in a human neuron?
Mitochondria No - A small amount of DNA is found in the mitochondria, but most of the DNA is found in the cell nucleus. Cell No - This is not the best answer among the four choices. Most of the DNA is found in the cell nucleus. Ribosome No - Ribosomes are the site of the protein synthesis. Most of the DNA is found in the cell nucleus. Nucleus Yes - Most of a cell's DNA is housed in the nucleus.
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
Statements 1, 2 and 3 No - Statement 3 is wrong. Chromosomes contain many genes. Statements 1 and 3 No - Statement 3 is wrong. Chromosomes contain many genes. Statements 1 and 2 Yes - A gene is a unit of heredity, and it encodes a functional molecule. Statements 2 and 3 No - Statement 3 is wrong. Chromosomes contain many genes.
What does DNA ----> RNA -----> Protein mean?
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. No - The words complementary and template have been switched. The sequence of bases in a gene is used to make mRNA copy, which is read by a ribosome to make a change of amino acids that folds into a protein. Yes - DNA ----> RNA -----> Protein is a symbolic way to describe the process of reading a gene sequence, making mRNA copy of the gene, which ribosomes use to make 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 folds into a protein. No - DNA ----> RNA -----> Protein is a symbolic way to describe the process of reading a gene sequence, making mRNA copy of the gene, which ribosomes use to make protein The sequence of amino acids in a gene is used to make mRNA copy, which is read by a ribosome to make a chain of bases that folds into a protein. No - The words amino acid and bases have been switched.
Chromosomes are replicated _______. Which of the following completes the sentence above?
during the genetic code No - The genetic code is related to protein synthesis and is not involved in chromosome replication in mitosis No - Mitosis is a phase of the cell cycle when replicated chromosomes are separated into opposite ends of a cell just before the cell divides in two in a phase of the cell cycle Yes - Chromosomes are replicated in a specific phase of the cell cycle. by ribosomes No - Ribosomes are the site of protein synthesis and are not involved in chromosome replication.
