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67 Terms

1
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Define the term autotroph.

an organism that can produce its own food for energy.

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Define the term heterotroph.

an organism that obtains its energy and nutrients by consuming other organisms.

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What are the distinguishing features of animals?

Animals are multicellular, lack cellulose cell walls, lack chloroplasts, and have nervous coordination, among other traits.

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How do fungal cells store carbohydrates?

as glycogen.

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What are the distinguishing features of plants?

Plants are multicellular, have cell walls made of cellulose, contain chloroplasts for photosynthesis, and store carbohydrates as starch or sucrose.

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What is the feeding method of fungi known as?

saprotrophic nutrition.

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Define prokaryotic organism.

a single-celled organism that lacks a nucleus and other membrane-bound organelles in its cells. e.g. plants, animals, fungi

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What are the distinguishing characteristics of bacteria?

Bacteria are microscopic, single celled organisms that have a cell wall, cell membrane, cytoplasm, and plasmids. They lack mitochondria, a nucleus and other membrane-bound organelles.

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Define the term saprobiont/decomposer

an organism that feeds on dead organic matter.

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Name two examples of bacteria.

Lactobacillus (used in yogurt production) and Pneumococcus (causing pneumonia).

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Which foodstuff is produced using the bacteria Lactobacillus bulgaricus?

yoghurt.

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digestion

breaking down larger complex molecules into simpler molecules

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what is the criteria for something to be considered living?

movement, respiration, sensitivity, control, growth, reproduction, excretion, nutrition

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nutrition

taking in and using food and other nourishing substances by the body

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nutrition in plants

plants use sunlight, carbon dioxide and water to produce oxyge and glucose in photosynthesis

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photosynthesis

plants convert light energy from the sun into chemical energy stored in glucose

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respiration

chemical reactions in cells that break down nutrient molecules & release energy for metabolism. it uses the oxygen supplied from gas exchange to release energy in the form of ATP

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metabolism

set of chemical reactions in the body that convert food into energy and building materials for growth, repair, and maintenance. It consists of two main processes: catabolism and anobolism

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catabolism

breaking down molecules down to release energy

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anabolism

building up molecules, which requires energy

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excretion

removal of toxic materials and substances from organisms produced by metabolic reactions

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cellular respiration

cells convert glucose and oxygen into energy, CO2 and water. for energy

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difference between egestion and excretion

excretion comes from chemical reactions in cells whilst egestions comes from remains of substances not absorbed during deigestion

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sensitivity

ability to detect and respond to stimuli in its surroundings

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nervous system

system of receptos, neurones and effectors which detect and respond to differen stimuli using electrical impulses

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endocrine system

response to stimuli using chemical messengers

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homeostasis

living organisms must control their internal environment to keep conditions within required limits e.g. glucoregulation and osmoregulation

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nucleus

contains genetic material, including DNA, which controls the cell’s activities

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cyptoplasm

a jelly like material that contains dissolved nutrients, salts and structures called organelles. it is where many of the chemical reactions happen.

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cell membrane

controls the movement of substances in and out of the cell, protects the cell

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cell wall

provides strucuture and protection. only plant cell walls are made from cellulose

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chloroplast

organelle that contains the green pigment, chlorophyll which absorbs light energy for photosynthesis, contaisn the enzymes needed for photosynthesis

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vacuole

contains cell sap, used for storage of certain material also helps support the shape of the cell

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mitochondria

organelles that contain the enzymes for respiration where most energy is released in respiration

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ribosome

tiny structures where protein synthesis occurs

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organelle

part of the cell with a particular function

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cell

basic structural unit of living organisms

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tissue

a group of similar cells working together to perform a particular function

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organ

structure in the body of a plant/animal that is a group of different tissues working together to perform a partcular function

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organism

a living thing that has an organised structure

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what do stem cells have the ability to do?

they can generate healthy cells to replace cells affected by disease

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how do stem cells have the ability to do generate healthy cells?

through a process called differentation in which they develop into specialised cell types

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what does unicellular mean

it only has one cell which eats, grows, moves and reproduces e.g. bacteria

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what does multicellular mean?

made up of many cells, different cells have different jobs e.g. humans

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what is a protoctist

types of living thing that usually just has one cell, they are mostly unicellular and can be very different from each other, they don’t fit into the plant, animal or fungus categories

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flagellum

these can rotate/move in a whi-like motion to move the bacterium

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plasmid

small circular ring of DNA which carry specific genes

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capsule

protects the bacteria allowing it to remain undetected

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chromosome

contain the genes used for making protein

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why is the mixture milk heated to 85-95 degrees celsius?

pasteurisation to kill bacteria

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why is the milk cooled to 45 degrees celsius

homogenised to prevent the bacteria from being killed by high temperatures

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what is the name of the sugar in milk?

lactose

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what causes the pH in yogurt to drop?

fermentation, from the lactic acid which is produced

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what is coagulation

liquid turns into a more solid state

55
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explain how a fungus feeds on corn

the fungus excretes digestive enzymes out side of its body, these enzymes will digest the corn , the broken down corn will be absorbed by the fungus again

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pathogen

an organism that causes disease e.g vrus, bacteria, protoscist, fungi

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parasite

cannot survive without a host cell, they use the host to carry out living processes

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HIV

destroys white blood cell, defects in the immune system so the person is more likely to catch diseases

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influenza

fever, runny nose, sore throat

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tobacco mosiac

light green, yellow/white mottling on leaves

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suggest two ways prions differ from viruses

no genetic material, not recognized by immune systema, viruses have protein coat, viruses can be used as vectors

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how does bile help with the digestion of lipids

emulsifies the lipids which increases the surface area for lipase enzymes to break them down

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factors that affects rate of diffusion

concentraton gradient, temperature, surface area, distance to diffuse across/surface area:volume

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diffusion

the movement of particles from a high concentration to a low concentration until an equilibrium is reached it happens when a substance is more concentrated in one place than another

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concentration gradient

difference in concentraion in different spaces

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fermentation

when tiny organisms like yeast/bacteria turn sugars into other substances

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homogenisation

breaking down of fat droplets