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Flashcards in viruses Deck (28)
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1

name the 7 processes that deems a organism 'living'

movementrespirationsensitivitygrowthreproductionexcretionnutrition

2

what is a prokaryote

an organism with no nucleus

3

what is the function of pilli

used in conjugation

4

what is a nucleoid

a coil of DNA in prokaryotes

5

what is the cell wall of prokaryotes made of

murein (peptidoglycan)

6

what is the purpose of a slime coat in prokaryotes

to help bacteria form a colonycan cause disease

7

what type of ribosomes do prokaryotes have

70S small

8

describe plasmid DNA

not associated with the nucleiantibiotic resistant genes are present here

9

what is the purpose of mesosome

aerobic respiration in prokaryotes

10

name the four things a virus is made up of

DNA or RNAviral envelopecapsid containing the DNA or RNA proteins

11

what is the purpose of the proteins on the outside of a virus cell

help recognise and bind to cells

12

what is the viral envelope in a virus cell

fatty lipid molecules taken from cells in a host

13

what does a bacteriophage have that a normal virus cell doesnt

collarsheath basplatespiketail fibres

14

what is different about a retrovirus

they have a large latent period where people are unaware that there is a virus presentthey insert into the chromosomes in the nucleus of the cell

15

describe the process of a normal virus affecting an organism

inserts DNAhost cells begin replicating virus based on the instructions in the viral DNAhost cell bursts open and virus is released

16

do virus' reproduce

yes but not alone a host cell does the reproduction using the instructions of the viral DNA

17

do animals have centrioles

yes

18

do prokaryotes have 80s ribsomes

no

19

how do prokaryotes respire

using the mesosome

20

what has a plasmodesmata

plants

21

what is endosymbiotic theory

a theory that describes the origin of mitochondria and chloroplasts

22

evidence that chloroplasts come from free living cells

the have their own circular DNA and have 70S ribosomes the same as prokaryotes

23

what bacteria have chloroplasts evolved from

cyanobacteria

24

how did the free living cells 'get into' the prokaryote cells

through the endocytosis allowing them to come into the cell and evolving to live within that cell, over time forming an animal or plant cell

25

what type of relationship did the prokaryotes and mitochondria have

a symbiotic relatinship - the prokaryote protected the mitochondria and the mitochondria produced energy for the cell

26

what is robert hooke famous for

used a simple microscope to observe a slice of cork he observd shape that reminded hm of monks living quarters and so named the structure 'cells'

27

what are the three tenets of cell theory

all living organisms are composed of one or more cells the cell is the most basic unit of life all cells arise from pre existing living cells by biogenesis

28

what four types of tissues do mammals have

epithelial, muscular, nervous and connective