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Asexual Reproduction in Bacteria — Reading Comprehension

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This audio-integrated passage for Grade 6 students delves into the fascinating world of asexual reproduction in bacteria, specifically focusing on binary fission. It explains how these tiny organisms create genetically identical offspring without a partner. Aligned with NGSS standard LS1.B: Growth and Development of Organisms, the content covers key concepts like single-celled organisms, genetic material, and the rapid reproduction of bacteria. Students will learn essential vocabulary and understand the simple yet powerful process that allows bacteria to thrive. The passage, combined with interactive activities, offers a comprehensive learning experience on this core biological principle.

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Four-stage diagram showing bacterial binary fission with DNA duplication and cell division. — Bacteria reproduce by binary fission, creating identical offspring from one parent cell.

Imagine an organism that can make a perfect copy of itself, all by itself, without a partner! This incredible process happens all the time with tiny living things called bacteria. Bacteria are single-celled organisms, meaning they are made up of only one cell. They are everywhere – in the soil, in water, and even inside your body. Many bacteria are harmless, and some are even helpful, but some can cause illness.

How do these tiny creatures reproduce? They use a method called asexual reproduction. The word "a-sexual" means "without sex." This means that one parent organism can create new offspring on its own, without needing another parent. In the case of bacteria, this process is called binary fission.

Let's break down binary fission step by step. First, the bacterium grows larger. Inside its single cell is its genetic material, which is like the instruction manual for building the bacterium. This genetic material, usually a single loop of DNA, makes an exact copy of itself. Think of it like making a photocopy of the instruction manual.

Next, the two copies of the genetic material move to opposite ends of the bacterial cell. The cell then begins to stretch out and divide in the middle. Finally, the cell splits into two separate, new bacteria. Each new bacterium is a complete, working organism, and it has an identical copy of the genetic material from the original parent bacterium. This means the offspring are genetically identical to the parent.

Binary fission is a very fast and efficient way for bacteria to reproduce. Some bacteria can divide every 20 minutes! This is why a small number of bacteria can quickly become a very large number, which is important for understanding how bacterial infections spread or how beneficial bacteria can colonize an environment. It's a simple yet powerful survival strategy for these microscopic life forms.

Interesting Fact: If conditions are just right, a single bacterium could produce billions of offspring in a single day!

What are bacteria made of?

One cellMany cellsNo cellsPlant cells

What is the process of bacterial reproduction called?

Binary fissionSexual reproductionPhotosynthesisRespiration

Binary fission involves two parent bacteria.

TrueFalse

What does 'asexual' mean?

Without sexWith partnersVery fastAlways harmful

What happens to the genetic material first?

It makes copiesIt disappearsIt mergesIt shrinks

How do the new bacteria compare genetically?