Life at the Molecular and Cellular Level
Authored by Louie Dimalaluan
Science
9th Grade
NGSS covered
Used 4+ times
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30 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of enzymes in biological processes?
To provide energy for reactions
To speed up chemical reactions
To store genetic information
To transport molecules across cell membranes
Answer explanation
The primary function of enzymes is to speed up chemical reactions in biological processes by lowering the activation energy required, making reactions occur more efficiently.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a key component of the cell membrane?
Nucleic acids
Phospholipids
Ribosomes
Mitochondria
Answer explanation
Phospholipids are a key component of the cell membrane, forming a bilayer that provides structure and regulates the movement of substances in and out of the cell. The other options do not play a direct role in membrane structure.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the relationship between cellular respiration and photosynthesis?
Both processes release oxygen as a byproduct
Photosynthesis converts glucose into energy, while cellular respiration converts energy into glucose
Photosynthesis stores energy in glucose, while cellular respiration releases energy from glucose
Both processes occur in the mitochondria
Answer explanation
Photosynthesis captures energy from sunlight to convert carbon dioxide and water into glucose, storing energy. Cellular respiration then breaks down glucose to release that stored energy, making this choice correct.
Tags
NGSS.HS-LS2-5
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which phase of the cell cycle involves the replication of DNA?
G1 phase
S phase
G2 phase
M phase
Answer explanation
The S phase of the cell cycle is where DNA replication occurs, ensuring that each daughter cell receives an identical set of chromosomes. The G1 and G2 phases involve growth and preparation, while the M phase is for mitosis.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do enzymes affect the activation energy of a chemical reaction?
They increase the activation energy
They decrease the activation energy
They have no effect on the activation energy
They eliminate the need for activation energy
Answer explanation
Enzymes act as catalysts that lower the activation energy required for a chemical reaction to occur. By decreasing this energy barrier, enzymes increase the rate of the reaction, making it easier for the reaction to proceed.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which property of water is most important for maintaining homeostasis in organisms?
High surface tension
Low density as a solid
High specific heat capacity
Ability to dissolve nonpolar substances
Answer explanation
High specific heat capacity allows water to absorb and retain heat, stabilizing temperatures in organisms and their environments, which is crucial for maintaining homeostasis.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of ribosomes in a cell?
To synthesize proteins
To replicate DNA
To store energy
To transport substances
Answer explanation
Ribosomes are essential cellular structures that synthesize proteins by translating messenger RNA (mRNA) into amino acid sequences, making them crucial for cell function and growth.
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