2023 STAAR Interim Cat 1

2023 STAAR Interim Questions Category 1

Multiple Choice

A scientist is examining an unknown cell using an electron microscope. Which observation would indicate the cell is most likely prokaryotic?

• mitochondrion

• free floating DNA

• chloroplast

• membrane bound nucleus

Multiple Choice

Students investigate osmosis using dialysis tubing. Dialysis tubing is a semi-permeable membrane that water molecules pass through while preventing salt ions from passing through.

The students followed this procedure:

1.      mix salt into the water to make 7.1% salt solution.

2.      add equal amounts of water of this saltwater solution to four small bags made of dialysis tubing.

3.      Fill four beakers with different salt solutions as shown on the image.

4.      Place each small bag into one of the four beakers.

5.      Observed changes in the size of the bags.

The setup for the investigation is shown.

In which beaker will osmosis cause expansion of the dialysis bag

• Beaker 1

• Beaker 2

• Beaker 3

• Beaker 4

Multiple Choice

Which two components are most likely found in both viruses and prokaryotic cells?

• Nucleic acids and Carbohydrates

• Carbohydrates and Lipids

• Lipids and Proteins

• Proteins and Nucleic acids

Multiple Choice

Which of these is most likely an indication that cells may have become cancerous?

• Cells undergoing slower rates of mitosis

• cells with few or no mutations

• cells not responding to checkpoints in the cell cycle

•   cells with decreased rates of protein synthesis

Multiple Choice

Microorganisms are known to be present in some food products such as yogurt. One student claims that microorganisms in food always have a negative effect on human health, while the second student disagrees. The second student claims that some microorganisms in food can have a positive effect on human health.

Which statement best supports the second student's claim?

•   Microorganisms can destroy any pathogens that affect the immune system.

• Microorganisms reproduce too slowly to affect the immune system.

• Microganisms known to be in food are no longer living and would not affect the digestive system.

• Microorganisms can aid in absorption of nutrients from food within the digestive system

Multiple Choice

Which cellular components are the same in all living organisms?

• Mitochondria

• Nuclei

• Nucleotides

• DNA sequences

Multiple Choice

A student is making models of cells using the following materials:

·        dried peas to represent ribosomes

·        shelled peanuts to represent mitochondria

·        uncooked noodles to represent DNA

·        shoe strings represent the cell membrane

Which material would be used as a model of a eukaryotic cell but not a prokaryotic cell?

• Dried peas (ribosome)

• shelled peanuts (mitochondria)

• uncooked noodles (DNA)

• shoe strings (cell membrane)

Multiple Select

Students studying mitosis captured an image of cells from an onion root tip with a camera mounted on a microscope.

Which events occur after the phase circled in the student's image?

Select two correct answers.

• Spindle fibers form

• Chromosomes condense

• Paired chromosomes separate

• The nuclear membrane disappears

• The cytoplasm separates into teo cells

Multiple Choice

An image of a cell is shown.

Which phase of the cell cycle is the cell in?

• G₀ phase

• S phase

• G₂ phase

• M phase