Test
B3- Science. Cells, Genes and Enzymes.
Preguntas del test (34)
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
2A cell membrane is...
- Awhere most of the reactions involved in respiration take place.
- Bwhat holds the cell together and controls what goes in and out.
- Ca gel-like substance where most of the cell's chemical reactions happen.
3What is a ribosome?
- AWhere proteins are synthesised.
- BThe part that holds the cell together and controls what goes in and out.
- CWhere most of the reactions involved in respiration take place.
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.
5What is Mitochondria?
- AWhere most of the reactions involved in respiration occur.
- BWhere photosynthesis happens.
- CAnother name for a bacterial cell.
6Cells that need lots of energy contain many mitochondria. Which cells need lots if mitochondria?
- ALiver and Muscle cells.
- BPlant cells.
- CEvery cell.
7Instead of a nucleus, what do bacterial cells have?
- AChloroplasts.
- BA single-circular strand of DNA.
- CMitochondria.
8What are Chromosomes?
- ACell malfunctions.
- BLong molecules of coiled up DNA.
- CEnzymes.
9DNA is a double helix (a double stranded spiral). Each of the two DNA strands are made up of what?
- AProteins.
- BCricks.
- CNucleotides.
10Nucleotides contain a small molecule called a "base". How many bases are there and what are they called?
- A3-BOE
- B5-TRLE
- C4-ACGT
11Each base 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.
12Who were the first scientists ever to build a model of DNA?
- ACatson and Wrick.
- BDarwin and Lamarck.
- CWatson and Crick.
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.
14What does DNA do every time a cell divides?
- AAdds another strand.
- BAdds another "base" called O.
- CCopies itself so that each new cells still has the full amount of DNA.
15What do new nucleotides do during this process?
- ABreak up.
- BJoin on using complementary base-pairing (ATCG). Making an exact copy.
- CLose base pairs.
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.
18A section of DNA that codes for a particular proteins is called a...
- AEnzyme.
- BNucleus.
- CGene.
19Proteins are made up of chains of molecules called what?
- ACells.
- BChloroplasts.
- CAmino Acids.
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)
23The amino acids are joined together to make proteins, following how many bases there are in a gene.
- AVerdadero
- BFalso
24So, why does each gene contain a different sequence of bases?
- ASo it can produce more cells.
- BSo it can code for a unique protein.
25What carries the code to the Ribosomes?
- ADNA.
- BProteins.
- CmRNA.
26Where are the ribosomes?
- AThe Nucleus.
- BThe Cytoplasm.
- CThe Mitochondria.
27To 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.
28If 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.
29DNA controls a cell by...
- Aturning the cell on and off.
- Bcontrolling protein production.
- Cmaking more DNA.
30Different types of cell have different functions because they make different proteins.
- AVerdadero
- BFalso
31Why do some genes switched off?
- ASo certain proteins are not produced.
- BSo more proteins can be produced in different places.
32In 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.
- BOr are muscle cells switched on and bone, nerve and skin cells are switched off.
33What is the function of a carrier molecule?
- ATo carry messages around the body.
- BStrengthen connective tissues.
- CTo transport smaller molecules.
34What 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
- MissChurro
- Idioma
- English
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