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1 | |
The fundamental units of life are |
| | A) | genes. |
| | B) | alleles. |
| | C) | chromosomes. |
| | D) | cells. |
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2 | |
Organelles called ____ provide energy from the products of digestion. |
| | A) | endoplasmic reticulum |
| | B) | mitochondria |
| | C) | lysosomes |
| | D) | Golgi bodies |
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3 | |
Tay-Sachs disease results from the absence of a particular enzyme found in the |
| | A) | endoplasmic reticulum. |
| | B) | mitochondria. |
| | C) | lysosomes. |
| | D) | Golgi bodies. |
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4 | |
A replicated chromosome consists of two very long strands of identical chromosomal material called |
| | A) | telomeres. |
| | B) | chromatids. |
| | C) | centromeres. |
| | D) | genes. |
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5 | |
DNA synthesis occurs during the ____ phase of the cell cycle. |
| | A) | gap 1 (G1) |
| | B) | gap 2 (G2) |
| | C) | S |
| | D) | Mitosis |
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6 | |
In ____, chromosomes align down the center of the cell, held by the spindle. |
| | A) | prophase |
| | B) | metaphase |
| | C) | anaphase |
| | D) | telophase |
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7 | |
During ____, replicated chromosomes condense, the spindle forms, and the nuclear membrane breaks down. |
| | A) | prophase |
| | B) | metaphase |
| | C) | anaphase |
| | D) | telophase |
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8 | |
In ____, centromeres part and one set of chromosomes is pulled to each end of the cell. |
| | A) | prophase |
| | B) | metaphase |
| | C) | anaphase |
| | D) | telophase |
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9 | |
Chromosome tips, or ____, function as a cellular clock that ticks down as pieces are lost from the very ends. |
| | A) | chromatids |
| | B) | centromeres |
| | C) | centrioles |
| | D) | telomeres |
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10 | |
____ molecules assist cell movement of white blood cells. |
| | A) | Signal transduction |
| | B) | Prion |
| | C) | Cellular adhesion |
| | D) | Peroxisome |
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11 | |
Which of the following pairs a genetic disorder with the incorrect defective macromolecule or essential nutrient? |
| | A) | Lesch-Nyhan syndrome - nucleic acids |
| | B) | maple syrup urine disease - vitamins |
| | C) | familial hypercholesterolemia - lipids |
| | D) | lactose intolerance - carbohydrate |
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12 | |
Which inherited disease is caused by faulty ion channels? |
| | A) | cystic fibrosis |
| | B) | Lesch-Nyhan syndrome |
| | C) | sickle cell anemia |
| | D) | maple syrup urine disease |
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13 | |
____ is a failure of ____ to fully separate the digits. |
| | A) | Syndactyly, apoptosis |
| | B) | Polydactyly, apoptosis |
| | C) | Syndactyly, mitosis |
| | D) | Polydactyly, mitosis |
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14 | |
A child is taken to the doctor with the following symptoms: low blood sugar, darkened skin, muscle weakness, and heartbeat irregularities. The doctor concludes that the child has ALD and the symptoms arise from the accumulation of very-long-chain fatty acids in the cells of the brain and spinal cord. The malfunctioning enzyme is associated with the |
| | A) | nucleus. |
| | B) | mitochondria. |
| | C) | lysosomes. |
| | D) | peroxisomes. |
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15 | |
Assume that a cell has 50 units of DNA at G1 of interphase. How many units of DNA would a cell at prophase of mitosis contain? |
| | A) | 25 |
| | B) | 50 |
| | C) | 100 |
| | D) | cannot be determined |
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16 | |
Assume that a cell has 50 units of DNA at G1 of interphase. How many units of DNA would a cell that has just completed cytokinesis contain? |
| | A) | 25 |
| | B) | 50 |
| | C) | 100 |
| | D) | cannot be determined |
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17 | |
Which of the three recognized domains of life consist of prokaryotes? |
| | A) | Archaea and Bacteria |
| | B) | Eukarya and Bacteria |
| | C) | Eukarya and Archaea |
| | D) | prokaryotes are still separately recognized |
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18 | |
Which is true of stem cells and progenitor cells? |
| | A) | Progenitor cells are less specialized than stem cells. |
| | B) | Progenitor cells are totipotent. |
| | C) | Stem cells are less specialized than progenitor cells. |
| | D) | D) Stem cells isolated from an adult have the same potential as stem cells isolated from embryos. |
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19 | |
After treatment of this disease, one would find high levels of copper in the urine of the individual. |
| | A) | Lesch-Nyhan syndrome |
| | B) | Maple syrup urine disease |
| | C) | Wilson disease |
| | D) | Biotinidase deficiency |
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20 | |
Secretion involves information transfer from the DNA to |
| | A) | mRNA which directs manufacture of proteins. |
| | B) | tRNA which directs manufacture of proteins. |
| | C) | tRNA which directs manufacture of mRNA. |
| | D) | mRNA which directs manufacture of tRNA. |
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21 | |
Membrane proteins can be involved |
| | A) | in signal transduction. |
| | B) | as cellular adhesion molecules. |
| | C) | in cell identification. |
| | D) | all of the above. |
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22 | |
Cancer can result from |
| | A) | deficient cell division. |
| | B) | excessive apoptosis. |
| | C) | both a and b. |
| | D) | neither a nor b. |
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23 | |
Which factors do not influence cell division? |
| | A) | crowding |
| | B) | growth hormones |
| | C) | cyclins |
| | D) | all of the above influence cell division |
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24 | |
____ retain the ability to specialize in particular ways in response to signals. |
| | A) | Organelles |
| | B) | Eukaryotic cells |
| | C) | Cell membranes |
| | D) | Stem cells |
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25 | |
The cells of which of the three domains of life contain ribosomes? |
| | A) | Archaea |
| | B) | Bacteria |
| | C) | Eukarya |
| | D) | all of the above |
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