Biology 189 Arizona College Questions and Answers 100% Pass
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Biology 189 Arizona College
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Biology 189 Arizona College
Biology 189 Arizona College Questions
and Answers 100% Pass
What part of the cell acts as a “bouncer,” deciding what gets in and out?
The cell membrane controls what enters and exits the cell, maintaining balance within the
cell.
Why do plants look so happy in the sun?
Plants use su...
Biology 189 Arizona College Questions
and Answers 100% Pass
What part of the cell acts as a “bouncer,” deciding what gets in and out?
✔✔The cell membrane controls what enters and exits the cell, maintaining balance within the
cell.
Why do plants look so happy in the sun?
✔✔Plants use sunlight in chloroplasts to perform photosynthesis, creating food in the form of
glucose and oxygen.
How does DNA pack so much info into such a tiny space?
✔✔DNA is tightly coiled around proteins called histones, forming chromatin, which allows it to
fit inside the cell's nucleus.
If proteins are like machines, where are they "built" in the cell?
✔✔Proteins are assembled at ribosomes, which read mRNA to link amino acids in the correct
order.
1
,What happens when you drop a red blood cell into a salty ocean?
✔✔It shrinks! The water inside the red blood cell moves out through osmosis, causing it to
shrivel.
Why does the mitochondria deserve its nickname, “the powerhouse”?
✔✔Mitochondria generate ATP, the energy currency of the cell, by breaking down nutrients
through cellular respiration.
How does your body "know" when to cool you down on a hot day?
✔✔The hypothalamus senses body temperature and triggers cooling mechanisms like sweating
to maintain homeostasis.
Why is your genetic code like a recipe book?
✔✔The genetic code in DNA provides instructions for building proteins, just like a recipe
provides steps to make a dish.
How does mitosis keep your body from falling apart?
✔✔Mitosis ensures that cells divide and create identical copies, allowing tissues to grow and
repair.
2
, Why do some bacteria have superpowers when it comes to surviving extreme environments?
✔✔Certain bacteria form endospores, tough protective structures that help them survive harsh
conditions like heat and dehydration.
What’s the "checkpoint system" in the cell cycle?
✔✔Cell cycle checkpoints ensure that cells don’t divide with damaged DNA or incomplete
replication, preventing errors.
Why do you need oxygen if you want to make the most energy from your food?
✔✔Oxygen is the final electron acceptor in the electron transport chain during cellular
respiration, enabling the production of the maximum amount of ATP.
What would happen if you didn’t have any lysosomes in your cells?
✔✔Without lysosomes, your cells couldn’t break down waste or worn-out organelles, leading to
a buildup of harmful materials.
How do cells avoid “traffic jams” when moving materials around inside?
3
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