cell diversity - exam papers Flashcards
the nuclear membrane temporarily disappears during mitosis
true
the chromosomes are double-stranded at the start of prophase
true
prophase is the period of the cell cycle when the cell is not dividing
false
the spindle fibers contract during anaphase
true
at the end of mitosis, a plant cell splits in two by forming a cleavage furrow
false
mitosis gives rise to four haploid daughter cells
false
cancer results when the cells lose their ability to control meiosis
false
describe two events that occur during prophase
Nuclear membrane breaks down, chromosomes become shorter and spindle fibres forms
Describe one event that occurs during metaphase
spindles attach to chromosome
Draw a labelled diagram of a cell with a diploid number of four at anaphase of mitosis
Eight chromosomes
Chromosomes being pulled apart
labels - chromosome / spindle / equator / poles / centromere
Describe how cell division occurs in
An animal cell
Cleavage furrow forms
Describe how cell division occurs in:
A plant cell
cell plate forms
Name the stage of mitosis shown in the diagram
anaphase
Justify your answer : anaphase
Spindle shortening and spindle contracting
Identify the part labeled X in the diagram
spindle
Explain what is meant by the term diploid
two sets of chromosomes
State the diploid number of the cell containing this nucleus
4
Outline one function of mitosis in humans
growth and repair tissue
Give one example of a human cell not produced by mitosis
gamete
spindle fibres contract during metaphase of mitosis
false
glucose is produced by yeast cells during fermentation
false
the process of translation results in a protein being made
true
prokaryotic cells contain a nucleus
false
darwin and Wallace proposed the theory of natural selection
true
a mutation to a cell’s DNA always has a negative impact for the cell
false
the ribosome of the cell contains the chromosomes
false
which type of microscope is used in the school laboratory to observe cells like these
light microscope
give two observable events that happen during prophase
nuclear membrane breaks down and spindle forms
m on metaphase
6th cell from the left
A on anaphase
2nd cell from left
describes what happens in animal cells and plant cell after mitosis
in animal - cleavage
in plant cells - cell plate
what stage of the cell cycle is represented by X
interphase
define mitosis
cell forming two identical daughter cells
state two ways in which meiosis differs from mitosis
four nuclei produced
variation not identical
explain term cancer
a group of disorders due to uncontrolled rate of mitosis
explain diploid
two sets of chromosomes
what’s the function of mitosis in single-celled organisms
asexual reproduction
what is the function of mitosis in multi-celled organisms
repair of tissue
what term is used to describe the long stage of the cell cycle when cell division is not occurring?
interphase
name two types of biomolecule that are produced in the cell during this stage of the cell cycle
protein and fat
name one organelle that is replicated at this stage of the cell cycle
mitochondria
give any two other changes which will have occurred in the cell by the end of this stage of the cell cycle
short chromosomes
formation of spindle
why no division of red blood cells
no nucleus
single-celled organisms use meiosis for asexual reproduction
false
in telophase of mitosis, a cleavage furrow forms in plant cells
false
when a cell is not dividing it is said to be in prophase
false
the nuclear membrane disappears in the early part of mitosis
true
centromeres give rise to the nuclear spindle
false
mitosis is a source of variation
false
in multicellular organisms, mitosis is primarily used for growth
true
what name is applied to the period of the cell cycle in which division is not taking place?
interphase
give a cellular process that occurs during this period in which the nucleus is not diving
growth
what is the role of mitosis in single-celled organisms
reproduction
what medical term is used for the group of disorders in which certain cells lose normal control of mitosis?
cancer
