Keystone 2024/25 Practice, Module 1 Focus

DNA sequence​ --> (a)   -->​ (b)   -->​ (c)   --> protein

• mRNA sequence
• tRNA sequence
• amino acid sequence
• RNA sequence
• Protein sequence

Tags

PA.3.1.10.A1.

Match the Fight-or Flight Response in a rabbit with correct pieces of models to identify the organization of an organ system.

• nerve tissue

• The rabbit's heart rate increases.

• brain

• Cells in the hear receive the chemical signals.

• neurons

• Neurons signal the brain that danger may be near.

• nerve tissue

• Signals from the brain cause chemical signals to be released through blood vessels.

• nervous system

• A rabbit hears a noise perceived as dangerous.

Tags

PA.3.1.10.A8.

PA.3.1.B.A8a.

The nervous system and circulatory system work ________ in response to danger.

The graph shows data collected from studying a black bear. Which investigation would provide the best evidence that changes in a bear's heart rate are a response to temperature changes and are a mechanism that helps the bear maintain homeostasis?

• measuring the heart rate of a grizzly bear in the same seven-month period

• measuring the heart rate of another black bear and the average temperatures during the day for a one-month period

• measuring the average temperatures in a polar bear's ecosystem in the same seven-month period

• measuring heart rates of a larger sample size of black bears and the average temperatures during the same seven-month period

Tags

PA.3.1.C.A2.

Students labeled a photosynthesis model. Which student labeled the model correctly?

• student 1

• student 2

• student 3

• student 4

Tags

PA.3.1.B.A2a.

A student claims that sugar molecules can be converted directly to proteins by the cell since proteins contain the same elements as sugar. Which statement best evaluates this claim?

• The claim is incorrect because proteins contain nitrogen. Cells can use the elements in sugar but will need to combine them with other elements to form proteins.

• The claim is incorrect because all proteins are enzymes, which are used to make sugar molecules.

• The claim is correct because proteins help form DNA, and DNA synthesis uses energy from sugar molecules.

• The claim is correct because proteins are made from only carbon, hydrogen and oxygen, which are all parts of a sugar molecule.

Tags

PA.3.1.B.A7b.

PA.3.1.C.A1.

Which statement correctly identifies the relationship between cellular respiration and energy requirements?

• More intense exercise causes cellular respiration to decrease, resulting in a reduced output of oxygen.

• The intensity of exercise does not change the rate of cellular respiration, so the carbon dioxide input remains unchanged.

• As exercise intensity increases, the rate of cellular respiration increases. This requires more oxygen and produces more carbon dioxide.

• As exercise intensity decreases, the rate of cellular respiration decreases. This requires less carbon dioxide and produces less oxygen.

Tags

PA.3.1.10.A2.

PA.3.1.10.A7a.

Energy pyramids represent the flow of energy through organisms at different trophic levels in the same ecosystem. If the producers in a desert ecosystem receive 90,000 kilocalories (kcal) of energy from the sun, about how much energy would be available to secondary consumers in this ecosystem?

• 90 kcal

• 900 kcal

• 9,000 kcal

• 900,000 kcal

Tags

PA.3.1.10.A2.

Students constructed the setup shown in the diagram and noticed that the limewater changed from clear to cloudy. Which phrase best describes the student investigation?

• evidence of aerobic respiration

• evidence of anaerobic respiration

• evidence of photosynthetic oxygen release

• evidence of photosynthetic carbon dioxide release

Tags

PA.3.1.10.A2.

The model shows some ways that matter moves between the biosphere and atmosphere as a result of different processes. Which label correctly identifies the question mark in the model?

a

Carbon dioxide gas

nitrogen gas

hydrogen gas

oxygen gas

Tags

PA.3.1.B.A2a.

PA.3.1.B.A2c.