RC2 STAAR Prep Quiz

Albumin is a protein that is secreted by liver cells and transported to the bloodstream. What factor most directly determines the amino acids that are combined to create albumin?

• The temperature of the cell when translation is taking place

• The number of chromosomes in a cell

• The sequence of nucleotides in DNA

• The amount of energy that is available in the cell

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NGSS.HS-LS1-1

The base sequence of a segment of DNA is shown.

Which base sequence correctly completes DNA Strand 2?

• A T A C G T

• C G C A T G

• G C G T A C

• T A T G C A

A Texas horned lizard (Phrynosoma cornutum) and a Texas bluebonnet (Lupinus texensis) are shown.

These two DNA sequences best provide evidence that —

• all organisms have an identical genetic sequence

• the nucleotides making up the genetic code are common to all organisms

• the Texas horned lizard eats the Texas bluebonnet

• mutations occur randomly in the genetic code

A diagram of the steps in the production of a protein is shown.

Which description identifies the purpose of Step A in this process?

• To correct mutations in the DNA sequence

• To produce an exact copy of the DNA molecule

• To copy the DNA of a gene sequence onto a strand of mRNA

• To assist in the folding of a protein

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NGSS.HS-LS1-1

The temperature at which American alligator eggs are incubated will affect the gender of the offspring. Eggs kept at 30 °C tend to hatch mostly female, while eggs kept at 33 °C tend to hatch mostly male. Which statement explains why the temperature affects the gender of alligator hatchlings?

• Gene repair occurs differently at different temperatures.

• Gene expression is different at different temperatures.

• Different parts of the embryo’s DNA are deleted at different temperatures.

• Different parts of the embryo’s DNA are duplicated at different temperatures.

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NGSS.HS-LS3-2

Two mutations of a genetic sequence are shown. A DNA codon chart is also shown.

Which mutation would have the MOST significant impact on the gene product?

Why would the impact be so significant?

Review the diagram carefully. Then enter your answer and your explanation in the box provided.

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NGSS.HS-LS1-1

NGSS.HS-LS3-2

The diagram shows a type of chromosomal mutation. What type of mutation is shown?

• Deletion

• Insertion

• Duplication

• Translocation

Tags

NGSS.HS-LS3-2

Achondroplasia is an inherited condition that affects the formation of bone in humans. The allele for achondroplasia (A) is dominant to the unaffected allele (a).

If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have achondroplasia?

Enter your answer in the box. Your answer must be a whole number.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A cell undergoing a biological process is shown.

Which process occurs between Step 2 and Step 3 and creates more genetic diversity in the resulting cells?

• Chromosome nondisjunction

• Genome replication

• Crossing over

• Chromosomal deletion

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2