The three particles that make up atoms are d. protons, neutrons, and electrons. Which of the following statements about a compound is true? A. The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed. A covalent bond is formed as the result of b. sharing electrons. In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is a. slightly negative. A substance with a pH of 6 is called a. an acid.
In chemical reactions, atoms are c. rearranged.
The energy needed to get a reaction started is the b. activation energy. A substance that speeds up the rate of a chemical reaction is called a. a catalyst. What advance in technology made the discovery of cells possible? d. The microscope Which of the following is NOT a principle of the cell theory? c. Very few cells are able to reproduce. Not all cells are alike. Which of the following is NOT a true statement about differences between cells? d. Most cells have a membrane, but some do not. Which of the following organisms are prokaryotes? c. Bacteria Which of the following conclusions could you draw about the cell shown in Figure 7–1? a. The cell is eukaryotic because it has a nucleus. Which of the following is a function of the nucleus? a. Stores DNA Which structure makes proteins using coded instructions that come from the nucleus? d. ribosome Which organelles are involved in energy conversion? a. mitochondria and chloroplasts Which organelle would you expect to find in plant cells but not animal cells? c. chloroplast You will NOT find a cell wall in which of these kinds of organisms b. animals Which of the following structures serves as the cell’s boundary from its environment? b. cell membrane The diffusion of water across a selectively permeable membrane is called b. osmosis An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes a. water to move into the cell. The cells of unicellular organisms are c. able to carry out all of the functions necessary for life. Which of the following is an example of an organ? a. heart
Which list represents the levels of organization in a multicellular organism from the simplest level to the most complex level? d.cell, tissue, organ, organ system As a cell becomes larger, its a. volume increases faster than its surface area. All of the following are problems that growth causes for cells EXCEPT b. excess oxygen. Compared to small cells, large cells have more trouble d. moving needed materials in and waste products out. The process by which a cell divides into two daughter cells is called a. cell division An advantage of sexual reproduction over asexual reproduction is that sexual reproduction c. provides genetic diversity Which of the following lists structures from smallest to largest? c. double helix, nucleosome, coil, supercoil, chromosome During which phase in the cell cycle does mitosis happen? a c. M phase When during the cell cycle is a cell’s DNA replicated? c. S phase The structure labeled A in Figure 10–5 is called the a. centromere. During which phase of mitosis do the chromosomes line up along the middle of the dividing cell? c. metaphase
Which of the following represents the phases of mitosis in their proper sequence? a. prophase, metaphase, anaphase, telophase In eukaryotic cells, the timing of the cell cycle is regulated by b. cyclins. Cancer is a disorder in which some cells have lost the ability to control their c. growth rate. Cancer cells form masses of cells called a. tumors
During early development, all cells in the embryo of a multicellular organism are identical. Later on in development, the cells will become specialized through a process called c. differentiation. Why are stem cells important? d. They have the potential to develop into other cell types.
Look at Figure 8–1. All of the following are parts of an ADP...
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