AP Biology : Understand functions of organelles in the cell
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Example Questions
Example Question #2141 : Ap Biology
Which of the following is a correct description of an organelle's function?
Chloroplast is the location of photosynthesis, and the process that turns light energy into chemical energy.
Perixisome produces lipids and gets rid of toxins
Mitochondria is the location of respiration and the exchange of gases.
The smooth ER contains metobolic enzymes for digestion of food.
Nucleolus is the site of mRNA production for protein synthesis.
Chloroplast is the location of photosynthesis, and the process that turns light energy into chemical energy.
Chloroplast is the location of photosynthesis, which is the conversion of sunlight energy into chemical energy (in form of chemical bonds). Mitochondria is the site of cellular respiration which is the conversion of chemical energy into ATP. Respiration, or otherwise known as breathing, occurs in the respiratory system. Lysosomes or peroxisomes contain digestive enzyme not the Smooth ER. The Smooth ER is responsible for breaking down of toxins and creation of lipids. The nucleolus is the site of rRNA production for the synthesis of ribosomes which make proteins.
Example Question #2142 : Ap Biology
The shape of an animal cell is determined by which of the following?
Cell wall
Cholesterol
None of these answers
Plasma membrane
Cytoskeleton
Cytoskeleton
The cytoskeletion determines cell shape. The cytoskeleton consists of three different types of filamentous proteins: microfilaments, intermediate filaments, and microtubules. Elements of the cytoskeleton can interact with the cell membrane and cell junctions to alter the cell's overall structure.
There are no cell walls in animal cells, although the cell wall does play a large part in determining cell shape in organisms that possess them (plants, bacteria, fungi).
Example Question #2143 : Ap Biology
Which organelle works to synthesize an unstable form of energy?
Rough endoplasmic reticulum
Chloroplast
None of the other answer choices is correct.
Two of the other answer choices are correct.
Mitochondria
Two of the other answer choices are correct.
The unstable form of energy that is syntheisized refers to ATP. ATP is an unstable; its three phosphate groups are all negatively charged and repel one another. Remember that BOTH the mitochondria and chloroplast participate in ATP synthesis via chemiosmosis; however, only the chloroplast participates in glucose synthesis via photosynthesis. Note that glucose is a stable form of energy and is not readily usable until it is broken down in the process known as glycolysis.
Example Question #81 : Cell Biology
The nucleolus __________.
is only found in prokaryotes
contains all the DNA of the cell
is found in prokaryotes and eukaryotes
None of the other answer choices is true.
is a part of the nucleus responsible for assembling ribosomes
is a part of the nucleus responsible for assembling ribosomes
The nucleolus is a subdivision of the nucleus; thus, it is only found in eukaryotes. It is the site of ribosome assembly. The nucleolus is made of RNA and proteins.
Example Question #82 : Cell Biology
Histones __________.
play a role in gene regulation
are only found in eukaryotic cells
All of the answer choices are true.
are protiens around which DNA coils
are only found in the nucleus
All of the answer choices are true.
Histones are proteins found in the nucleus of eukaryotic cells. DNA wraps itself around histones to further condense. Also, depending on how tightly the DNA is wrapped around the histones, it may or may not be availible for activity (e.g. replication or transcription). Cells modify the interaction between DNA and histones around certain genes under certain conditions to make those genes available or unavailable as needed.
Example Question #175 : Cell Structures
In which of the following organisms are vacuoles not usually found?
Fungi
Mammals
Bacteria
Plants
Mammals
Vacuoles are membrane-bound structures that are found in bacterial, plant, fungal, and occasionally, animal cells. Vacuoles function in storage of water and waste and in maintenance of turgor pressure in plants.
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