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Biology Chapter 5 - from hw
Terms in this set (51)
Which gene acts as a tumor suppressor gene that will help prevent cancer formation?
Body cells, which are cells that do not undergo meiosis to become sperm or oocytes, are also called _____ cells.
The repeating sequence of events in eukaryotes that involves cell growth and cell division is called the _____ _____
The stages of the cell cycle that includes growth, DNA doubling, and when the nucleus is not actively dividing, are collectively called _____
A cell rounds up and loses contact with its neighbors at the beginning of ______.
The _____ gene is an important control mechanism behind preventing cancer formation.
Signals that ensure that stages of the cell cycle follow one another in the normal sequence are more likely to be ______ signals.
somatic cells are .....
able to undergo mitosis, body cells
Choose ALL possible outcomes in a cell that cannot pass the G1 checkpoint because its DNA is damaged.
-The cell may move into G0 if DNA repair is not possible.
-The p53 protein will attempt to initiate DNA repair.
-Apoptosis will occur if the DNA cannot be repaired.
the cell cycle is ...
a set of orderly stages that occur between one cell division and the next
Proto-oncogenes and tumor suppressor genes control.....
the movement of a cell through the cell cycle
the portion of the cell cycle when the cell is getting ready to divide
Eukaryotic chromosomes are composed of _____, which is a mixture of DNA and protein.
At the conclusion of apoptosis, a cell fragments and its bits are engulfed by _____ _____ cells.
In humans, mitosis produces cells that are _____
Signals that tell a cell to divide are more likely to be ______ signals.
A cell organelle that occurs in the centrosome and helps organize a mitotic spindle for chromosome movement during animal cell division is called a(n) _____.
Damaged DNA in a cell can prevent the cell from passing which of the checkpoints?
the first stage of mitosis is _____
the last stage of mitosis is _____
The balance between what two types of genes determines if cell division does or does not occur.
tumor suppressor genes and proto-oncogenes
Chromatin is composed of _____ and _____
dna and protein
the stage of mitosis in animal cells which involves alignment of centromeres of duplicated chromosomes.
Mitosis produces daughter cells that have _____ number of chromosomes as the parent cell
Chromosomes become visable, nuclear envelop dissolves, spindle forms
Centrioles are a type of microtubule organizing center found only in _____ cells
cytokinesis begins in _____, continues in _____, and finishes just before the next _____.
anaphase, telophase, interphase
five stages of mitosis
prophase, pro metaphase, metaphase, anaphase, telophase
Meiosis is a type of nuclear division that occurs as a part of _____ reproduction, and the resulting daughter cells have _____ the number of chromosomes, 23, in humans.
A cell in prophase would have which of the following characteristics?
sister chromatids present, condensed chromatin
Which of the following is true about a homologous chromosome pair?
One came from "mom" and one from "dad."
Cytokinesis begins during _____ of mitosis and is completed just before the cell(s) enter the next _____, preparing for a new division.
The spindle forms, chromosomes condense, the nuclear envelope fragments, the nucleolus disappears, homologous chromosomes pair off, and crossing-over occurs during _____ I of meiosis I.
During _____ I of meiosis, homologous pairs of chromosomes align independently at the equator.
The type of nuclear division that occurs as part of sexual reproduction, in which the daughter cells receive the haploid number of chromosomes in varied combinations is _____
During independent _____, homologous chromosomes segregate in a random manner.
A pair of chromosomes that are alike and come together in synapsis during prophase of the first meiotic division are _____
Meiosis produces genetic variation among gametes by way of which of the following events?
crossing over, independent assortment
The process that occurs within the reproductive organs of the human body in order to produce gametes is called _____
The first phase of meiosis is _____ I.
The three events that distinguish meiosis from mitosis are.....
-separation of homologous chromosomes
-homologous chromosomes synapse
Fully formed spindles align homologous pairs of chromosomes on the metaphase plate during _____
The result of fertilization is called a(n) _____
During which phase of meiosis are you most likely to observe independent assortment?
In meiosis, _____-_____ occurs during prophase I and results in new mixtures of genes
during metaphase I, _____ _____ results in new mixtures of chromosomes
A single male sex cell undergoing meiosis will produce _____ sperm cells.
Within most tissues of the human body, a process called _____ occurs to produce new cells.
Crossing over is an event that distinguishes _____ from _____
A single cell called a _____ is formed by the fusion of gametes
In human males, spermatogenesis produces _____ _____
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