l Verizon LTE 4:37 PM KBack CHAP-1-Journal Questions.docx Chapter 1: Exploring L
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l Verizon LTE 4:37 PM KBack CHAP-1-Journal Questions.docx Chapter 1: Exploring Life and Science 1) Describe the characteristics of life: levels of organization, response to stimuli, reproduction, grow & development, acquiring materials and energy 2) Define homeostasis. What are the two parts of homeostatic system? Describe negative feedback and how it regulates body temperature. Describe positive feedback and give an example. (Also use pages 84-87 in text for this question) 3) Define technology and give three examples of how it is used. 4) Describe the basic concept of the biotechnology revolution. Research on the Internet, using onlygov, org or.Edu sites, two ways that genetically engineered food is valuable for mankind and two ways it could be a problem for human health. 5) Find two other current advances in the use of biotechnology 6) What is the goal of science as a process? Distinguish between objective and subjective observations 7) In general, what steps do investigators follow when using the scientific method? (See Figure 1.7) 8) Tuskegee Discussion: Research and write a one paragraph summary source (s). on "Tuskegee Experimen ts". Include and cite your 9) Answer following questions on Tuskegee Experiments: a) Where and when was this experiment begun? b) Who conducted the study? c) What was the purpose of this study? d) Which institution (s) supported this? Previous Next Dashboard Calendar To Do Notifications InboxExplanation / Answer
Q. Describe characteristics of life?
The study of life is also known as Biology which helps us classify and describe living things based on their function, growth, origin, evolution and distribution. All living organisms share several key characteristics or functions such as :
1) Order or Levels or Organization:
Order in a living thing can be highly organised and complex structure which includes cells, tissues, organs and organ structures. As we know, cells are the basic unit of life, even single cellular organisms such as amoeba, paramecium, etc. have a highly complex cllular structure. Withi one cell, there are several cell organelles such as nuclei, mitochodria, ER, etc which makes it even more remarkable.
In multi cellular organismss, a group of similar cells form a tissue together. And several tissue of similar type collaborate to form an organ. Organs work togther to fom a organ system.
2) Sensitivity or Response to Stimuli:
Every living organism do respond to certain stimuli. For example, Mimosa pudica, which is commonly known as 'Touch-me-not' plant, tends to fold inwards and droop when touched. This response is reflex in order to defend themselves from harm, and re-open a few minutes later.
Likewise, a plant always grows towards the sunlight where as its roots will grows towards the soil/away from the sunlight (geotropism). Movement toward a stimulus is considered a positive response, while movement away from a stimulus is considered a negative response.
3) Reproduction:
All living beings have the ability to reproduce. If a species is unable to reproduce, it will go extinct. A reproduction is th process of creating a new life and making next generation. There are 2 types of reproduction- Sexual and Asexual.
Sexual reproduction involves two parents and the fusion of gametes, haploid sex cells from each parent. Sexual reproduction produces offspring that are genetically unique and increases genetic variation within a species.
Asexual reproduction involves only one parent. It occurs without a fusion of gametes and produces offspring that are all genetically identical to the parent. Such kind of reproduction is usually seen in sungle cellular organisms.
4) Growth and Development
Just like reproduction, all the living organisms have the ability to grow when provided optimum condition favorable for their growth. A seed may look like a pebble, but under the right conditions it will sprout and form a seedling that will grow into a larger plant.
All organisms grow and develop following specific instructions coded for by their genes. These genes provide instructions that will direct cellular growth and development, ensuring that a species’ young will grow up to exhibit many of the same characteristics as its parents.
5) Acquiring Materials and Energy (Metabolism):
Even the smallest organisms are complex and require multiple regulatory mechanisms to coordinate internal functions, respond to stimuli, and cope with environmental stresses. Such internal mechanisms require energy which the cells acquire from the process of metabolism. The chemical reactions that occur inside an organism to build up or break down materials to create energy is known as metabolism.
Two examples of internal functions regulated in an organism are nutrient transport and blood flow. Organs (groups of tissues working together) perform specific functions, such as carrying oxygen throughout the body, removing wastes, delivering nutrients to every cell, and cooling the body.
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