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| 1 | |
The major molecules that make up the cell membrane are |
| | A) | carbohydrates and proteins. |
| | B) | carbohydrates and nucleic acids. |
| | C) | phospholipids and proteins. |
| | D) | nucleic acids and fatty acids. |
| | E) | water and cholesterol. |
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| 2 | |
In the fluid mosaic model, the molecules of the double layer (bilayer) are |
| | A) | cholesterol. |
| | B) | phospholipids. |
| | C) | carbohydrates. |
| | D) | nucleic acids. |
| | E) | proteins. |
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| 3 | |
Which of these organelles is surrounded by a double membrane layer, in which there are many pores? |
| | A) | nucleus |
| | B) | rough endoplasmic reticulum |
| | C) | Golgi apparatus |
| | D) | lysosomes |
| | E) | both a and b |
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| 4 | |
In which of these organelles is chromatin found? |
| | A) | lysosomes |
| | B) | rough endoplasmic reticulum |
| | C) | Golgi apparatus |
| | D) | secretory vesicles |
| | E) | nucleus |
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| 5 | |
Which of these organelles function as intracellular digestive systems and contain enzymes? |
| | A) | lysosomes |
| | B) | rough endoplasmic reticulum |
| | C) | Golgi apparatus |
| | D) | nucleus |
| | E) | secretory vesicles |
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| 6 | |
As a result of exercise, there is an increase in the number of ________ in muscle cells. |
| | A) | nuclei |
| | B) | mitochondria |
| | C) | lysosomes |
| | D) | Golgi apparatus |
| | E) | smooth endoplasmic reticulum |
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| 7 | |
Which of these structures contains microtubules? |
| | A) | cilia |
| | B) | cytoplasm |
| | C) | flagella |
| | D) | all of these |
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| 8 | |
Large polar molecules that are not lipid-soluble, such as glucose and amino acids, move across the cell membrane by |
| | A) | dissolving in the lipid bilayer. |
| | B) | moving through membrane channels. |
| | C) | being transported by carrier molecules. |
| | D) | being transported by vesicles. |
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| 9 | |
Given these characteristics: moves against the concentration gradient; requires energy in the form of ATP; requires carrier molecules. Which of these processes is described? |
| | A) | diffusion |
| | B) | facilitated diffusion |
| | C) | active transport |
| | D) | exocytosis |
| | E) | phagocytosis |
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| 10 | |
Formation of a secretory vesicle, fusion of the secretory vesicle to the cell membrane, and release of the contents of the secretory vesicle outside the cell describes |
| | A) | diffusion. |
| | B) | facilitated diffusion. |
| | C) | active transport. |
| | D) | phagocytosis. |
| | E) | exocytosis. |
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| 11 | |
Aerobic respiration produces ______ ATP molecules, ______ require oxygen to be available, and produces _____ as end product(s). |
| | A) | 2, does not, CO2 and water |
| | B) | 2, does, lactic acid |
| | C) | 36-38, does not, lactic acid |
| | D) | 36-38, does, CO2 and water |
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| 12 | |
A sequence of nucleotides in DNA that provides a chemical set of instructions for making a specific protein is called a |
| | A) | codon. |
| | B) | anticodon. |
| | C) | peptide bond. |
| | D) | mRNA. |
| | E) | gene. |
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| 13 | |
mRNA is copied from |
| | A) | DNA. |
| | B) | tRNA. |
| | C) | ribosomes. |
| | D) | polypeptide chains. |
| | E) | rRNA. |
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| 14 | |
By the process of mitosis in a human cell, ______ daughter cells are produced, each of which has ______ chromosomes. |
| | A) | 2, 46 |
| | B) | 2, 23 |
| | C) | 4, 46 |
| | D) | 4, 23 |
| | E) | 8, 23 |
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| 15 | |
The process of meiosis |
| | A) | includes meiosis I, II, and III. |
| | B) | results in the production of sperm cells or oocytes. |
| | C) | produces 4 diploid cells. |
| | D) | produces gametes that are identical to the parent cell. |
| | E) | produces new cells for growth or tissue repair. |
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