Test
B3- Science. Cells, Genes and Enzymes.
Crea una cuenta gratis para terminar este test
Guarda tu progreso y consulta tu resultado final.
¿Ya tienes cuenta? Inicia sesión
Preguntas del test (33)
1What is a "nucleus"?
- AGel-like substance where most of the cell's chemical reactions happen.
- BThe part of the cell which contains DNA in the form of chromosomes
- CWhere proteins are synthesised
- DThe point where two chromatids are joined together
2A cell membrane is...
- Aan organelle where most of the reactions involved in respiration take place.
- Ba bilipid layer which holds the cell together and controls what goes in and out.
- Ca gel-like substance where most of the cell's chemical reactions happen.
- Dan organelle which acts like the brain of the cell and stores memories.
3What is a ribosome?
- Aorganelle where proteins are synthesised.
- Bcell part that holds the cell together and controls what goes in and out.
- Corganelle where most of the reactions involved in respiration take place.
- Da short section of a chromosome that codes for a particular characteristic (trait).
4Cytoplasm is...
- Athe part of the cell which contains DNA in the form of chromosomes.
- Ba gel-like substance where most of the cell's chemical reactions happen.
- Ca relatively large structure that contains cell sap, a weak solution of sugar and salts.
- Dthe material that is combined with magnesium to make chlorophyll.
5What are mitochondria?
- Aorganelles where most of the reactions involved in respiration occur.
- Borganelle where photosynthesis happens.
- Canother name for a bacterial cell.
- Da disease of the muscles that makes them weaken.
6Cells that need lots of energy contain many mitochondria. Which cells need lots of mitochondria?
- ALiver and muscle cells.
- BPlant cells.
- CAll human body cells and some plant cells.
- DSieve tube cell in xylem
7Instead of a nucleus, what do bacterial cells have?
- AChloroplasts.
- BA single-circular strand of DNA.
- CMitochondria.
- DA nucleolus.
8What are chromosomes?
- ACell malfunctions.
- BLong molecules of coiled up DNA.
- CEnzymes.
- DColoured cells found in the skin of many animals.
9DNA is a double helix (a double stranded spiral). Each of the two DNA strands are made up of what?
- AProteins.
- BCricks.
- CNucleotides.
- DWatsons and cricks
10Nucleotides make up the rungs of DNA ladders and contain a small molecule called a "base". How many different types of bases are there in DNA molecules and what letters are they represented by?
- A3 - B, O & E
- B5 - T,R, L & E
- C4- A, C, G & T
- D4 - A, C, G & U
11Each base in DNA forms cross links to a base on the other strand. This keeps the two DNA strands tightly wound together. But which base pairs, pair with each other?
- AA pairs with G, and T pairs with C.
- BA pairs with T and C pairs with G.
- CT pairs with G and A pairs with C.
- DA pairs with U and G pairs with T.
12Who were the first scientists ever to build a model of DNA?
- ACatson and Wrick.
- BDarwin and Lamarck.
- CWatson and Crick.
- DFranklin and Rooseveldt
13What data did Watson and Crick use from other scientists to form the model of DNA?
- AX-Rays showing double helix and data showing that bases occurred in pairs.
- BAn X-ray of a skeleton.
- CGraphs showing DNA shrinking.
- DPlastic Leggo blocks.
14What does DNA do every time a cell divides?
- AAdds another strand.
- BAdds another "base" called O.
- CCopies itself so that each new cell formed still has the full amount of DNA.
- DUndergoes a mutation.
15What do new nucleotides do during this process?
- ABreak up.
- BJoin on using complementary base-pairing (A-T & C-G). Making an exact copy.
- CLose base pairs.
- DNothing.
16Which is correct?
- A|-TA-|
|-AC-|
|-GT-|
|-GA-|
|-AT-| - B|-TA-|
|-AT-|
|-GC-|
|-GC-|
|-AT-|
- A|-TA-|
17What does DNA control the production of?
- AProteins.
- BOxygen.
- CBlood.
- DCarbohydrates
18A section of DNA that codes for a particular proteins is called a...
- AEnzyme.
- BNucleus.
- CGene.
- DLocus.
19Proteins are made up of chains of molecules called what?
- ACells.
- BChloroplasts.
- CAmino Acids.
- DMonopers
20Each different protein has its own particular number and order of amino acids.
- AVerdadero
- BFalso
21If each protein has its own particular number and order of amino acids, does this give the proteins a different shape or a different function?
- AYes
- BNo
22How many bases is an amino acid coded by?
- A4. (Quad)
- B2. (Pair)
- C3. (Triple)
- DNone.
23So, why does each gene contain a different sequence of bases?
- ASo it can produce more cells.
- BSo it can code for a unique protein.
24What carries the code to the Ribosomes?
- ADNA.
- BProteins.
- CmRNA.
25Where are the ribosomes?
- AThe Nucleus.
- BThe Cytoplasm.
- CThe Mitochondria.
26To make proteins, ribosomes use the code in the DNA. DNA is found in the cell nucleus an can't move out of it because...
- ADNA is really big.
- BThe DNA will get lost.
- CDNA is really small.
27If the DNA can't leave the cell then another molecule is needed to get the code from the DNA to the Ribosome. This is called mRNA. How is it used?
- AIt takes the code from the DNA.
- BIt produces more DNA.
- CIt copies the code from the DNA.
28DNA controls a cell by...
- Aturning the cell on and off.
- Bcontrolling protein production.
- Cmaking more DNA.
- Dbeing located in the centre of the cell.
29Different types of cell have different functions because they make different proteins.
- AVerdadero
- BFalso
30Why do some genes get switched off?
- ASo certain proteins are not produced.
- BSo more proteins can be produced in different places.
31In a muscle cell, which genes are switched on and which are switched off?
- ABone, nerve and skin cells are switched on and muscle cells are off, to conserve energy.
- BMuscle cells are switched on and bone, nerve and skin cells are switched off.
32What is the function of a carrier molecule?
- ATo carry messages around the body.
- BStrengthen connective tissues.
- CTo transport smaller molecules.
33What is the function of a hormone?
- ATo produce proteins. e.g. muscle proteins.
- BTo carry messages around the body. e.g. insulin.
- CTo strengthen connective tissues.
Información
- Descripción
- Quiz on the B3 GCSE biology. Covers topics of Cells, DNA, Protein Synthesis, Functions of Proteins, More on Enzymes, Mutations, Multiplying cells, Meiosis, Gametes and Fertilisation, Stem Cells, Differentiation and Growth, Growth and Respiration.
- Autor
- Jeffrey Piggott
- Idioma
- English
- Visitas
- 35
- Etiquetas
- Valoración
- 4,0 de 5 · 1 valoración Valora este test