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Biology Practice Test Answers

Question: Which statement correctly describes how cellular DNA content and ploidy levels change during meiosis I and meiosis II?
A: DNA content is halved only in meiosis I. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.
B: DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid only in meiosis II.
C: DNA content is halved only in meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.
D: DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.
E: DNA content is halved only in meiosis I. Ploidy level changes from diploid to haploid only in meiosis II.

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DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.

EXPLANAION: During anaphase of both meiosis I and meiosis II, the DNA content (number of copies of chromosomes) in a cell is halved. However, the ploidy level changes only when the number of unique chromosomes sets in the cell changes. This occurs only in meiosis I (where seperation of homologous chromosomes decreases the ploidy level fron 2n to n and produces daughter cells with a single chromosome ser).

Question: Meiosis II is similar to mitosis in that
A: sister chromatids separate during anaphase.
B: the chromosome number is reduced.
C: homologous chromosomes synapse.
D: the daughter cells are diploid.
E: DNA replicates before the division.

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sister chromatids separate during anaphase.

Meiosis II is similar to mitosis in that sister chromatids of each chromosome separate.

Question: How are proteins transported to their correct location in the cell? See Section 7.5 (Page 158) .
A: The cell sends the proteins to the cellular compartment that currently has the least amount of proteins in it.
B: The cell always synthesizes a protein in the compartment in which it will be used.
C: Proteins contain molecular "zip codes" that allow them to be shipped to the correct cellular compartment.
D: Every protein will have a nucleic acid attached to it that tells the cell in which compartment it will be used.

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Proteins contain molecular "zip codes" that allow them to be shipped to the correct cellular compartment.

Question: The plant cell organelle most analogous to animal cell lysosomes is the
A: microsome.
B: leaf peroxisome.
C: vacuole.
D: glyoxysome.
E: endosome

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vacuole.

Question: Which of the following proteins requires GTP in the process of LDL receptor-mediated endocytosis?
A: uncoating enzyme
B: AP-2 complex
C: LDL receptor
D: clathrin
E: dynamin

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dynamin

Question: The low pH of lysosomes is established by
A: acid hydrolases.
B: ATP-dependent proton pumps.
C: β-glucuronidases.
D: catalases.
E: superoxide dismutases.

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ATP-dependent proton pumps

Question: Each of the following is part of the endomembrane system, except
A: Golgi complex.
B: endosomes.
C: lysosomes.
D: peroxisomes.
E: zymogen granules.

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peroxisomes.

Question: Each of the following organelles is part of the endomembrane system except
A: the peroxisome.
B: the Golgi complex.
C: the smooth endoplasmic reticulum.
D: the endosome.
E: the rough endoplasmic reticulum.

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the peroxisome.

Question: Which of the following statements about the smooth endoplasmic reticulum is/are correct?
A: Liver cells are abundant in SER.
B: The testes and ovaries are tissue types whose cells are abundant in SER.
C: The SER is the primary location for synthesis of membrane-bound proteins.
D: Cholesterol is made in the SER.
E: The luminal face of the SER is the main site at which membrane lipids are synthesized.
F: Phospholipids are synthesized from cytosolic water soluble precursor molecules.
G: Flippases are the enzymes that allow lateral movement of a lipid within a leaflet.

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The following statements about the smooth endoplasmic reticulum are correct
Cholesterol is made in the SER
The testes and ovaries are tissue types whose cells are abundant in SER
Phospholipids are synthesized from cytosolic water soluble precursor molecules
Liver cells are abundant in SER

Question: Each of the following is a component involved in the SNARE hypothesis model mechanism except
A: v-SNARE.
B: Rab GTPase.
C: tethering complex.
D: NSF protein.
E: All are involved.

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All are involved.

Question: Each of the following is true about botulinum toxin (botox) except
A: The toxin is one of the most potent toxins known.
B: Botox is a SNARE protein.
C: It can be used therapeutically to stop muscle spasms.
D: It has been used to remove wrinkles caused by muscle contractions.
E: It has potential use as a migraine headache treatment.

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Botox is a SNARE protein.

Question: The mannose-6-phosphate receptor would have what type of protein tag?
A: a KDEL ER retention tag
B: a trans-Golgi retention tag
C: a lysosomal targeting tag
D: a cis-Golgi retention tag

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a trans-Golgi retention tag

Question: Which of the following correctly matches a component of the cytoskeleton to one of its functions?
A: microtubules help animal cells divide in two
B: microfilaments form the nuclear lamina
C: microfilaments cause ciliary bending
D: intermediate filaments contribute to cytoplasmic streaming
E: microtubules move chromosomes

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microtubules move chromosomes

Question: Which of the following is not a function of the cytoskeleton?
A: cell movement
B: passive transport
C: cell division
D: moving of organelles
E: positioning of enzymes

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passive transport

Question: Which of the following is NOT a known function of the cytoskeleton?
A: to maintain a critical limit on cell Size
B: to provide mechanical support to the cell
C: to maintain characteristic shape of the cell
D: to hold mitochondria and other organelles in place within the cytosol
E: to assist in cell motility by interacting with specialized motor proteins

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to maintain a critical limit on cell Size

Question: What three distinct elements make up the cytoskeleton in eukaryotic cells?
A: flagella, cilia, and centrosomes
B: carbohydrates, lipids, and nucleic acids
C: actin filaments, intermediate filaments, and microtubules
D: ATP, TTP, and CTP

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actin filaments, intermediate filaments, and microtubules

Actin filaments are also known as microfilaments

Question: Which of the following correctly matches a cytoskeletal element with one of its functions?
A: Microtubules guide chromosomes during cell division.
B: A mutation that interferes with intermediate filament formation could result in layers of cells not adhering to one another.
C: Microtubules act as tracks for motor proteins like kinesin.
D: Cilia and flagella are made up of microfilaments.

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A mutation that interferes with intermediate filament formation could result in layers of cells not adhering to one another.
Microtubules act as tracks for motor proteins like kinesin.
Microtubules guide chromosomes during cell division.

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