Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
Explain what is meant by the term totipotent stem cell
|
1. Totipotent (stem cells) can give rise to all cell types
2. Stem cells are undifferentiated /unspecialised} 3. can keep dividing |
|
|
Explain what is meant by a double blind trial and suggest why it is important.
|
1. Some people with (new) drug and some without(new) drug /
2. use placebo /old drug 3. Doctors / eq} and {subjects do not knowwho is on (new) drug or who is not /eq ;4. to see if new drug works better than {placebo/ old drug}/eq ;5. reduces bias |
|
|
Suggest what is meant by the phrase suitably-prepared Petri dish.
|
1. To agar
2. idea that bacteria need to be distributed 3. Single bacterial strain 4. appropriate microbiological techniqueemployed e.g. aseptic / sterile plates ; |
|
|
Explain the meaning of the term stem cell.
|
1.undifferentiated cell
2. that can give rise to other types of cell 3. idea that no limit to division 4. correct reference to totipotent / pluripotent |
|
|
Niche
|
1. The {role / function / eq} (of a species /organism)
2. {within the community / ecosystem /habitat/ environment |
|
|
Species richness
|
1. number of (different) species
2. in a {habitat / eq } / at any one time |
|
|
Give two differences between genetic diversity and species richness.
|
Idea that, GD considers one species but SRconsiders {different / number} species
2. idea that, GD considers {alleles / genotypes / eq}but SR is within a {habitat / area |
|
|
Explain what is meant by the term phenotype.
|
1. Appearance / the outward expression (of a cell ororganism)
2. reference to {genotype / eq} contribution 3. reference to environmental factors |
|
|
Explain what is meant by the term haploid number of chromosomes.
|
1. The number of chromosomes in gametes/sexcells.
2. Half the number (of chromosomes) found in {bodycells / somatic cells / named body cell. 3. The number (of chromosomes) in a cell followingmeiosis |
|
|
Explain what is meant by the term gene locus.
|
1. Position/location of a gene. 2. On a Chromosome. |
|
|
Explain what is meant by the term pluripotent stem cell.
|
1. Undifferentiated / unspecialised} cell
2. Some genes {deactivated / switched off} 3. idea that it can give rise to most specialisedcells 4. but not totipotent stem cells / extra embryoniccells |
|
|
Explain what is meant by the term haploid nucleus.
|
1. idea of half the number of chromosomes found in a{normal body cell/somatic cell
2. idea of containing one chromosome from eachhomologous pair 3. the type of nucleus found in {gametes / sex cells /eq} 4. a nucleus is (an organelle / (double) membrane boundstructure |
|
|
Explain what is meant by the term tissue.
|
1. idea of a {group / number / collection / eq} of cells
2. idea of working together to carry out the {same /specific / one function |
|
|
Explain what is meant by double blind trial. |
1. Idea of one set of patients beinggiven the (new) drug and one seta placebo
2. neither patient nor { doctor /scientist / eq } knows if thetreatment contains the (new) drugor not 3. removal of bias from results |
|
|
State what is meant by the term species richness
|
The number of species in { an area /habitat
|
|
|
Explain what is meant by the term polygenic inheritance.
|
1. idea of more than one gene for a single characteristic
2. at different loci 3. idea of giving rise to continuous variation |
|
|
Explain what is meant by the term molecular phylogeny
|
1. idea of molecular { differences / similarities } 2. in { DNA / RNA }
3. in proteins / proteomics 4. idea of (evolutionary) relationships between organisms |
|
|
Explain what is meant by the term endemic species.
|
Idea of found in only one specific geographical location
|
