The sequence of nitrogenous bases in DNA varies widely. The sequence of the bases in DNA is most important for which of the following?

A student builds a model of a DNA strand.

Which of these shows bases that are complementary to the ones on the student’s DNA model?

Nitrogenous bases are located on both strands of the DNA double helix. What is the significance of the nitrogenous bases?

Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A diagram of a section of DNA is shown.

Which DNA strand is complementary to the one shown above?

Differences in traits such as hair texture are determined by differences in —

A student used poster board to construct this model of a section of DNA.

Which statement describes this model of DNA?

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans —

What does a Human, Bacteria, Fungi, and Plants have in common

Which statement describes the components that make up the genetic code of all organisms?

GloFish® are genetically modified fish which can be bought and kept as pets. They are zebrafish (Danio rerio) which have been modified to contain genes from jellyfish and sea coral that make them glow different colors. The ability to place genes from one species into another is based on the fact that -

What is the purpose of this cellular process?

Sickle-shaped red blood cells result from a mutation in the gene that codes for hemoglobin. This mutation results in sickle-cell anemia. A partial sequence of bases from a normal hemoglobin gene and a sequence that results in sickle-cell anemia are shown below.

What type of mutation is depicted in this sequence?

A certain mutation in the gene for hemoglobin results in the red blood cells becoming sticky, rigid, and irregularly shaped. These irregularly shaped red blood cells block the flow of blood throughout the body. A single base mutation is responsible for these irregularly shaped blood cells.

Which of these mutations most likely results in the mutated hemoglobin gene?

Scientists use zebra fish to study human genetic diseases because zebra fish and humans share many of the same genetic diseases. Which statement describes why zebra fish experience similar genetic diseases as humans?

The Himalayan rabbit’s habitat has cold, snowy winters and mild summers. The body is typically covered in white fur except for the nose, feet, tail, and ears, which are covered in black fur.

A scientist shaved an area of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area. The shaved area grew black fur.

Which of these best explains why the hair that grew back where the ice pack was placed was black and not white?

A mutation always causes a mutant phenotype

What process occurs before the other?

A gene is:

If the diagram represents a part of the process of protein synthesis, strand A would

Which statement best describes the relationship between the terms chromosomes, genes, and nuclei?

All cells contain the same genetic information. Why can't cells other than stem cells differentiate into various tissues?

The process indicated by arrow B (in previous question) is performed by the:

Place the following steps of Protein Synthesis in the correct order in which they occur:

1.Information copied from DNA moves to the cytoplasm.

2.Proteins fold and begin functioning.

3.DNA is copied and each new cell gets a full copy.

4. Proteins are assembled at the ribosomes.

A change to the ___ will cause a change in the ____ which can affect the ___ that is produced.

If the DNA was never transcribed into mRNA, the result would be that

In 1917 the biologist Thomas Hunt Morgan conducted studies in which he kept some caterpillars in the dark and placed some others under red, green, or blue lights. Exposure to red light produced butterflies with brightly colored wings. Exposure to green light resulted in dark-colored wings. Exposure to blue light or no light resulted in pale-colored wings. What was the most likely conclusion of Morgan’s research?

Some steps involved in DNA replication and protein synthesis are summarized below. Arrange the steps in the correct order in which they occur.

Step A

Information copied from DNA moves to the

cytoplasm.

Step B

Proteins fold and begin functioning.

Step C

Proteins are assembled at the ribosomes.

Step D

DNA is copied and each new cell gets a full copy.

Put the steps of translation in order:

1.amino acids bind to each other, the chain lengthens

2.tRNA binds to the corresponding mRNA

3.a stop codon is reached, the newly formed protein is released.

The chart shows relationships between genes, the environment, and coloration of tomato plants. Which statement best explains the final appearance of these tomato plants?

Organisms can be classified based on homology, which is shared characteristics inherited from a common ancestor. In the past, homologies were based on studies of anatomical structures and patterns of embryonic development. In more recent years, the use of molecular biology techniques has allowed homologies to be compared at the level of nucleotide sequences. Nucleotide sequence comparisons are possible because all organisms share which of the following?

If a DNA molecule is found to be composed of 40% thymine, what percentage of adenine would be expected.

A nucleotide consists of:

The two sides of the DNA ladder are loosely bonded together by:

Which of the following base pair sequences could be produced in DNA replication?

Semi-conservative replication of DNA refers to the idea that

Transcription is

What is the name of the molecule responsible for transporting information from the nucleus to the site of protein synthesis?

The function of transfer RNA (tRNA) is to:

DNA passes information to RNA during the process of

mRNA is synthesized in:

mRNA has:

How many codons equal one amino acid

tRNA brings amino acids to the:

A polypeptide is a sequence of

tRNA has

tRNA transfers amino acids during

__________ takes place in the ribosomes

Each nucleotide triplet in mRNA that specifies a particular amino acid is called a(n)

The process of transferring a gene’s instructions for making a protein is –

The process indicated by arrow A occurs in the —