22 Biology STAAR Questions

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Class:

• 2A
• 2B
• 3A
• 3B
• 4A

Which statement best describes how a virus replicates?

• F A virus divides into two identical virus particles before infecting the host cell.
• G A virus enters a host cell and uses the materials from the host cell to produce new virus particles.
• H Multiple virus particles fuse and form a large particle that breaks apart, releasing new virus particles.
• J Multiple virus particles break down in component parts, which then reassemble into new copies of the virus.

Which of these shows an example of an insertion mutation?

• A
• B
• C
• D

When a stem cell divides, it produces two daughter cells. One daughter cell will remain a stem cell, while the other daughter cell will differentiate into a specialized cell. Which factor will most directly determine what type of specialized cell will be produced?

• F The size of the cell
• G The length of the cell cycle
• H The number of chromosomes that are replicated
• J The genes that are expressed

Scientists determined the total mass of DNA from a sample of animal cells. The masses of equal numbers of cells were taken during three different stages of the cell cycle. Stage I contains cells massed during G1 of the cell cycle. Which statement best describes the cells during Stage II?

• F The cells have replicated their DNA, but have not completed mitosis and cytokinesis.
• G The cells have completed mitosis and cytokinesis without replicating their DNA.
• H The cells have replicated their DNA and completed mitosis and cytokinesis.
• J The cells have temporarily exited the cell cycle without replicating their DNA.

Which type of movement across a cell’s plasma membrane requires energy supplied by ATP?

• F Passive transport
• G Simple diffusion
• H Active transport
• J Osmosis

A model of transcription and a codon chart are shown Which amino acid would be coded first from the DNA strand being transcribed?

• F Cys
• G Phe
• H Ile
• J Met

A cellular process is shown. Which of these is the most likely result of the process shown in the diagram?

• F Chromosome replication will cease to avoid errors that result in mutations.
• G Offspring will no longer express traits from previous generations.
• H Gametes will contain new allele combinations.
• J Chromatids will have less genetic variety.

What components make up the backbone of a DNA molecule?

• F Purines and deoxyribose
• G Pyrimidines and purines
• H Deoxyribose and phosphate groups
• J Phosphate groups and pyrimidines