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Descripción
Test por cloud.berry, actualizado hace más de 1 año
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Creado por cloud.berry
hace más de 11 años
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Pregunta 1
Pregunta
The largest organelle in a cell is the ____ .
Respuesta
-
Nucleus
-
Mitochondria
-
Cytoplasm
-
Plasma membrane
Pregunta 2
Pregunta
The first thing to divide during cell division is the ____ which controls and directs the activities of the cell throughout life; it contains the ____ which is passed from generation to generation during reproduction.
Respuesta
-
Nucleus | hereditary material
-
Nucleus | gene
-
Cytoplasm | chromosome
Pregunta 3
Pregunta
Each ____ consists of ____, a huge molecule consisting of 2 ____ strands in the form of a double helix which runs ____ of the chromosome and is supported by ____ .
Respuesta
-
Chromosome | DNA | paired | the full length | protein
-
Chromosome | DNA | separate | for half | histones
-
Chromatid | DNA | linked | the full length | protein
Pregunta 4
Pregunta
A pair of genes with the same alleles are called ____ .
Respuesta
-
Homozygous
-
Heterozygous
-
Homologous
Pregunta 5
Pregunta
When the ____ chromosomes have paired up closely, each pair is called a ____.
Respuesta
-
Homologous | bivalent
-
Homozygous | Bivalent
Pregunta 6
Pregunta
Crossing over occurs in ____ .
Respuesta
-
Prophase I
-
Metaphase I
-
Prophase II
-
Metaphase II
-
Anaphase I
-
Anaphase II
-
Telophase I
-
Telophase II
-
Cytokinesis
Pregunta 7
Pregunta
The four ____ cells produced in meiosis differ genetically from each other because of ____ & ____ .
Respuesta
-
Haploid | Independent assortment | Crossing over
-
Diplod | Independent assortment | Crossing over
Pregunta 8
Pregunta
Mutations occurring in the body cells of multicellular organisms are called ____ mutations.
Respuesta
-
Somatic
-
Nomatic
-
Domatic
-
Lomatic
-
Homatic
-
Comatic
Pregunta 9
Pregunta
A mutation is a change in the ____ or ____ of ____ which may result in a ____ of an organism.
Respuesta
-
Type | genetic structure | the cell | change in the characteristics
-
Amount | chemical structure | DNA | change in the characteristics
-
Amount | base structure | DNA | change in the functions
Pregunta 10
Pregunta
Non - disjunction is the term given to the ____ and go to opposite poles during the nuclear division of the nucleus.
Respuesta
-
Failure of a pair chromatids to separate
-
Success of a pair of chromatids separating
-
Failure of a pair of chromosomes to separate
Pregunta 11
Pregunta
People with down syndrome have an extra chromosome __ , giving them a total of 47 chromosomes.
Respuesta
-
21
-
9
-
7
-
23
-
1
-
3
-
11
Pregunta 12
Pregunta
In chromosome mutations there is a change in the ____ or ____ of ____ . Gene mutations are changes in the ____ of ____ in the ____ of a gene.
Respuesta
-
Number | sequence | bases | sequence | genes | DNA
-
Number | sequence | genes | sequence | bases | DNA
Pregunta 13
Pregunta
Sickle cell anaemia is brought about by base substitution which is an example of a gene mutation. Here ____ is substituted with ____ which causes the mutation.
Respuesta
-
Glu | Pro
-
Glu | His
-
Va | Glu
-
Leu | Val
-
Thr | Pro
-
Glu | Val
Pregunta 14
Pregunta
Haemoglobin, the ____ - transporting pigment of red cells, is made of 4 ____ molecules that interlock and form a compact molecule -two of the haemoglobin molecules are known as ____ and the other two as ____ .
Respuesta
-
Oxygen | protein | alpha | beta
-
Carbon dioxide | hydrogen | alpha | beta
Pregunta 15
Pregunta
The gene that codes for the amino acid sequence of beta haemoglobin occurs on chromosome ____ .
Respuesta
-
11
-
10
-
21
-
1
-
23
-
14
-
13
-
12
Pregunta 16
Pregunta
The gene that codes for beta haemoglobin is prone to a substitution of the base ____ to ____ in a codon for the amino acid glutamic acid.
Respuesta
-
A | T
-
T | A
-
C | A
-
A | C
-
G | C
-
C | G
-
C | T
Pregunta 17
Pregunta
Haemophilia is a ____ condition because the genes controlling the production of the blood proteins concerned are located on the ____ chromosome .
Respuesta
-
Sex - linked | X
-
Sex - linked | Y
Pregunta 18
Pregunta
As in mitosis, chromosomes replicate to form chromatids during interphase, however, in meiosis __ ___ chromosomes ___ and by the end of meiosis ___ they have ___ but the chromatids they consist of do not separate until meiosis __.
Respuesta
-
II | homologous | pair up | I | cross over | II
-
I | homologous | separate | I | separated | I
-
I | homologous | pair up | I | separated | II
-
I | homozygous | separate | II | separated | I
Pregunta 19
Pregunta
Ways of checking for sickle cell anaemia in embryos are:
Respuesta
-
blood test on the mother
-
Amniocentesis
-
chorionic villus sampling
-
blood test on the father
-
X ray of the embryo
Pregunta 20
Pregunta
The effects on the properties of the haemoglobin molecule if this base substitution occurs are:
Respuesta
-
they tend to clump together
-
they form short fibres that distort the red cells into plump disk shapes.
-
they become low in viscosity
-
they form unusually long fibres that distort the red cells into sickle shapes.
-
they become too large for the blood vessels.
Pregunta 21
Pregunta
The inheritance of a single characteristic is known as a monohybrid cross.
Respuesta
- True
- False
Pregunta 22
Pregunta
If alleles for a gene are different, they are said to be ___.
Respuesta
-
homozugous
-
homologous
-
heterozygous
-
heterologous
Pregunta 23
Pregunta
The ___ is the way in which the ___ of an organism is expressed- including the ___ of the organism.
Respuesta
-
genotype | phenotype
-
phenotype | genotype
-
appearance
-
beauty
Pregunta 24
Pregunta
when both alleles are expressed they are known as ___.
Respuesta
-
prodominant
-
the same
-
predominant
-
cosubmissive
-
equally powerful
-
codominant
-
this can never happen.
Pregunta 25
Pregunta
A gene is a pair of alleles that both affect the phenotype of an organism when present in a heterozygote.
Respuesta
- True
- False
Pregunta 26
Pregunta
A gene is the basic unit of inheritance by which inherited characteristics are transferred from parent to offspring, consisting of a length of DNA on a chromosome.
Respuesta
- True
- False
Pregunta 27
Pregunta
Examples of recessive conditions controlled by genes on the X chromosome are :
Respuesta
-
Haemohpilia
-
Sickle cell anaemia
-
Red-green colour blindness
-
Duchenne muscular dystrophy
-
Blue-green colour blindness
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