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science
chapter 7 lesson 1
| Question | Answer |
|---|---|
| ______________ are unicellular organisms that do not have a nucleus or other membrane bound organelles. | prokaryotes |
| ______________ art microscopic prokaryotes | bacteria |
| there are two types of prokaryotes bacteria and ____________ | archaea |
| A typical bacterium consists of DNA and _____________ surrounded by a cell membrane and a cell wall | cytoplasm |
| bacterial cytoplasm also contains _______________ | ribosomes |
| bacterial DNA occurs in one coiled, circular ________________ | chromosomes |
| A bacterium might also have smaller, circular _____________ that are separate from its other DNA | plasmids |
| Many bacteria have capsules with hairlike structures called ___________ that help the bacteria stick to surfaces | pili |
| bacteria are much ______________ than plant or animal cells | smaller |
| bacteria generally have one of three basic shapes sphere, rod, or _________ | spiral |
| some bacteria take in food and break it down and obtain ________ | energy |
| the food can come dead organisms or _________ hosts. | living |
| other bacteria make their food using energy from _____________ or chemical reactions | light |
| __________________ bacteria can survive without oxygen | anaerobic |
| ________________ bacteria need oxygen, as humans do | aerobic |
| many bacteria have long whiplike structures called ________________ that they use for movement | flagella |
| bacteria produce asexually by ___________________ , This type of cell division forms two genetically _________________ cells | fission identical |
| dining ______________, two bacteria of the same species attach to each other and combine their genetic material | conjugation |
| _____________ is transferred between bacteria during conjugation | DNA |
| conjugation results in new combination of genes and increases genetic ___________________________________________________________ | diversity |
| A _____________ forms when a bacterium builds a thick inner wall around its chromosome and part of the cytoplasm | endospore |
| An endospore can protect a bacterium from intense heat, cold, or ____________. It can remain _____________ for months or even centuries | drought dormant |
| like a bacterium, a ________________ has a cell wall but no nucleus or membrane bound organelles | archaean |
| the ribosomes of archaea more closely resemble the ribosomes of _____________ than those of bacteria | eukaryotes |
| Archaea often live in ________________ environments, such as hot sprints and salt lakes | extreme |
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Micha974