GED Science : GED Science

Study concepts, example questions & explanations for GED Science

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Example Questions

Example Question #5 : Biology And Life Sciences

Mitosis and meiosis are both processes by which cells reproduce.

Which of the following statements is true about mitosis?

Possible Answers:

Mitosis creates haploid cells that are exact copies of the original cell.

Mitosis results in the formation of 4 unique daughter cells.

Mitosis creates diploid cells that are exact copies of the original cell.

Mitosis creates haploid cells that are unique from the original cell.

Mitosis creates gametes.

Correct answer:

Mitosis creates diploid cells that are exact copies of the original cell.

Explanation:

Mitosis creates two diploid daughter cells that are identical to the original cell. This process creates somatic (body cells).

Example Question #2 : Mitosis

Which of the following is a key characteristic of metaphase?

Possible Answers:

Nuclear membranes form and the chromosomes gradually uncoil

The chromosomes move to a narrow central zone of the cell

Chromosomes coil so tightly that they become visible at individual structures

Chromosomes separate and move toward opposite ends of the cell

DNA replicates and there are two copies of each chromosome

Correct answer:

The chromosomes move to a narrow central zone of the cell

Explanation:

Metaphase is characterized by chromosomes moving to the narrow central zone of the cell called the metaphase plate/equator.

Example Question #21 : Ged Science

Which of the following events does not take place during both mitosis and meiosis?

Possible Answers:

The condensing of chromosomes

Dissolving of the nuclear membrane

Crossing over between non-sister chromatids

Separation of sister chromatids

Correct answer:

Crossing over between non-sister chromatids

Explanation:

Crossing over is an event that recombines DNA between homologous, non-identical chromosomes. The result is an increase in genetic variation because the resulting daughter cells have slightly different genetic combinations than the original parent cell. Crossing over only occurs during meiosis. This is because homologous chromosomes are only in adjacent positions during prophase I. Crossing over cannot occur during mitosis because this alignment is never present; daughter cells of mitosis are always genetically identical to the parent cell.

Sister chromatids separate during anaphase of mitosis and anaphase II of meiosis. Chromosomes condense and the nuclear membrane dissolves during prophase of mitosis and prophase I of meiosis.

Example Question #22 : Ged Science

Which of the following statements about meiosis is correct?

Possible Answers:

Meiosis produces four daughter cells that are genetically identical to the original parent cell

Meiosis increases genetic diversity through crossing over and independent assortment

Meiosis supports asexual reproductive strategies

Meiosis produces diploid cells

Meiosis occurs in all of the body's cells

Correct answer:

Meiosis increases genetic diversity through crossing over and independent assortment

Explanation:

Meiosis allows for increased genetic variation through crossing over and independent assortment. These processes result in daughter cells that are non-identical to the original parent cell. Crossing over describes the exchange of portions of DNA between homologous chromosomes, generating unique allelic combinations. Independent assortment means that the daughter cells of meiosis will have a mixture of genetic material from each set of the organism's alleles, representing DNA from both the mother and father sets of genes. The product of meiosis is four daughter cells that are genetically unique.

Each daughter cell of meiosis has only one copy of each gene, meaning that they are haploid. Only gametes (sex cells) undergo meiosis, allowing for sexual reproduction. The fusion of two haploid gametes results in a diploid cell.

Example Question #2 : Cells And Life

Mitosis and meiosis are both processes by which cells reproduce.

Which of the following is not true about meiosis?

Possible Answers:

Meiosis produces gametes.

Meiosis produces haploid cells.

Meiosis produces identical somatic cells.

Cells undergoing meiosis divide twice.

Meiosis produces 4 unique daughter cells.

Correct answer:

Meiosis produces identical somatic cells.

Explanation:

Meiosis is the process that creates gametes (eggs and sperm). The cell divides twice, creating 4 unique daughter cells that contain half (haploid) of the genetic information of the parent cell. Somatic cells are body cells and they are produced via mitosis.

Example Question #23 : Ged Science

Which step in cellular respiration results in the most ATP being produced?

Possible Answers:

The citric acid cycle

Oxidative phosphorylation

Fermentation

Glycolysis

Correct answer:

Oxidative phosphorylation

Explanation:

Cellular respiration is composed of many steps used to break down glucose and convert the chemical energy into ATP. Of the four steps described in the answer choices, oxidative phosphorylation via the electron transport chain is the most effective step for producing ATP. The electron transport chain can produce between 32 and 38 ATP from a single glucose molecule.

Example Question #24 : Ged Science

Where does glycolysis take place in the cell?

Possible Answers:

Mitochondrial matrix

The intermembrane space

Cytosol

Chloroplast

Correct answer:

Cytosol

Explanation:

Glycolysis is the first step of glucose breakdown in cells. This process takes place in the cytosol.

The second step of cellular respiration, the citric acid cycle, takes place in the mitochondrial matrix. The third step, the electron transport chain, takes place on the inner mitochondrial membrane and requires protons to be concentrated within the intermembrane space.

Example Question #25 : Ged Science

What statement about glycolysis is correct?

Possible Answers:

Glycolysis requires the use of the cell's mitochondria

Glycolysis is the breakdown of an 8-carbon sugar to two 4-carbon sugars

Only animal cells undergo glycolysis; plant cells do not

Glycolysis is not a necessary function for the cell to produce energy

Glycolysis occurs in the cytoplasm, without the need for accessory organelles

Correct answer:

Glycolysis occurs in the cytoplasm, without the need for accessory organelles

Explanation:

Glycolysis is the first step in cell metabolism. It is responsible for converting glucose (a 6-carbon sugar) into two molecules of pyruvate (a 3-carbon sugar). Glycolysis occurs in the cytoplasm, where the sugar molecules interact directly with enzymes. After pyruvate is created, it is transported to the mitochondria for the remainder of cellular respiration (the citric acid cycle and electron transport chain).

Though plants undergo photosynthesis, they also use cellular respiration. Glycolysis takes place in both animal and plant cells.

Example Question #12 : Cells And Life

Photosynthesis is a process that plants use to create energy.

What is the formula for photosynthesis?

Possible Answers:

\displaystyle 6CO_2 + 6H_2O \overset{sunlight}{\rightarrow} C_6H_{12}O_6 + 6O_2

\displaystyle 6CO_2 + 6O_2\overset{sunlight}{\rightarrow} C_6H_{12}O_6 + 6H_2O

\displaystyle C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O

None of these

\displaystyle 6O_2 + 6H_2O \rightarrow 6CO_2 + C_6H_{12}O_6

Correct answer:

\displaystyle 6CO_2 + 6H_2O \overset{sunlight}{\rightarrow} C_6H_{12}O_6 + 6O_2

Explanation:

Photosynthesis is the process by which plants use the sun's energy to convert water \displaystyle (H_2O) and carbon dioxide \displaystyle (CO_2) into glucose \displaystyle (C_6H_{12}O_6) and oxygen \displaystyle (O_2).

Example Question #2 : Cell Energy And Metabolism

Many chemical reactions are carried out by various cell organelles. 

Which of the following cell organelles carries out the reaction described by the equation \displaystyle C_6H_{12}O_6 + 6 O_2 \rightarrow 6 CO_2 + 6 H_2O + ATP?

Possible Answers:

Golgi apparatus

Lysosome

Mitochondria

Nucleus

Ribosome

Correct answer:

Mitochondria

Explanation:

The equation \displaystyle C_6H_{12}O_6 + 6 O_2 \rightarrow 6 CO_2 + 6 H_2O + ATP is the equation for cellular respiration. Cellular respiration happens inside the mitochondria and chloroplast for those cells containing chloroplasts.

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