STAAR Biology Practice Test

The four butterflies in the illustration represent the offspring in the F₁ generation. Which statement is best supported by the phenotypes of these offspring?

• The F₁ generation is composed only of males.

• Two of the offspring in the F₁ generation will not be able to reproduce.

• The F₁ generation is the result of a dihybrid cross.

• Two of the offspring in the F₁ generation will experience a spontaneous mutation

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The initial steps in gene expression are modeled. Double-stranded DNA first unwinds into two strands. Which process and product are represented in the diagrams?

• Process: transcription; product: mRNA

• Process: translation; product: protein

• Process: replication; product: tRNA

• Process: recombination; product: polymerase

Tags

NGSS.HS-LS1-1

The diagram represents one way an enzyme can be inhibited. Which statement explains the effect of an inhibitor on an enzyme?

• A substrate will be able to bond with the enzyme.

• The enzyme will likely be attacked by immune cells

• The enzyme will be unable to produce more enzymes.

• A substrate will be unable to attach to the enzyme.

Some students used vinegar to dissolve a way the shells of three eggs and used these eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions. Which statement best describes the role of the cell membrane in this model?

• The cell membrane is an impermeable barrier that prevents water from entering the cell.

• The cell membrane allows solutions to enter the cell, which causes the cell to shrink.

• The cell membrane allows water to enter and leave the cell.

• The cell membrane removes solutes from the environment.

Tags

NGSS.MS-LS1-2

What is this an example of?

• vestigial structures

• embryology

• homologous structures

• fossil record

Tags

NGSS.MS-LS4-2

NGSS.MS-LS4-3

A cell _______ in a hypertonic solution because water moves _______ the cell.

• shrinks; out

• shrinks; in

• swells; out

• swells; in

Tags

NGSS.HS-LS1-3

Which of the following follows the concentration gradient (high to low) but requires a transport protein?

• diffusion

• osmosis

• facilitated diffusion

• active transport

Name the process in the picture.

• transcription

• mitosis

• translation

• replication

Name M.

• light dependent cycle

• Carbon dioxide

• glucose

• Calvin cycle

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6

NGSS.HS-LS2-5

Name B.

• phosophate

• glucose

• deoxyribose

• nitrogen base