Biology, 17.10.2019 02:00 crowdedallys5385

16.
in plant cells, cytokinesis is completed by the formation of a(n)

cell plate.

equatorial plate.

membrane furrow.

spindle.
17.
in which of the following cases would asexual reproduction be most advantageous for an organism?

living where there are many available partners

when the need for adaptation is great

when new organisms are moving into and out of the population

living in a stable environment with little variation
18.
if a cell is exposed to a chemical that inhibits the production of spindle fibers as the cell is preparing for mitosis, what would most likely happen?

the cell would continue with mitotic division.

the cell would break open.

the cell would not divide.

the cell would undergo meiotic division.
19.
which of the following statements lists the steps that occur in the cell cycle, in chronological order?

centrioles move to opposite ends of the cell; cell passes through g1 checkpoint

sister chromatids are pulled apart to opposite ends of the cell; spindle fibers begin to appear

sister chromatids align in the middle; cytoplasm pinches in to separate daughter cells

nuclear membrane disappears; chromatin condenses
20.
devil facial tumor disease (dftd) is a disease that is decimating the population of tasmanian devils. the disease passes from one animal to another through bites and is caused by parasites. the parasites cause cancerous tumors that spread throughout an infected animal's body and kill it. what is the best description of dftd?

a non-infectious, cell-cycle disease

a non-infectious, chronic disease

an infectious, chronic disease

an infectious, cell-cycle disease
21.
the disruption of which cell function leads to gene mutations that result in cancer?

rna translation

rna transcription

protein synthesis

dna replication
22.
during the time of normal cell activity, dna exists in a loose, spaghetti-like form called

centromere

chromosomes

chromatin

histone
23.
the table below identifies three classes of genes that affect the cell cycle.

gene type gene activity
proto-oncogenes regulate progress though the normal cell
cycle
oncogenes cause uncontrolled cell cycle progression
tumor suppressor genes restrict cell cycle progression
which scenario transforms normal cells into cancer cells?

oncogenes become proto-oncogenes.

tumor suppressor genes become oncogenes.

proto-oncogenes become oncogenes.

tumor suppressor genes become pro-oncogenes.

Answers: 2

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Answers

16. In plant cells, cytokinesis is completed by the formation of a(n) cell plate.

17. In which of the following cases would asexual reproduction be most advantageous for an organism?
Living in a stable environment with little variation

18. If a cell is exposed to a chemical that inhibits the production of spindle fibers as the cell is preparing for mitosis, what would MOST likely happen?
The cell would not divide

19. Which of the following statements lists the steps that occur in the Cell Cycle, in chronological order?
Sister chromatids align in the middle; cytoplasm pinches in to separate daughter cells

20. What is the BEST description of DFTD?
an infectious, cell-cycle disease

21. The disruption of which cell function leads to gene mutations that result in cancer?
DNA replication

22. During the time of normal cell activity, DNA exists in a loose, spaghetti-like form called _chromatin_.

23. The table below identifies three classes of genes that affect the cell cycle.
Proto-oncogenes become oncogenes.

Answer from: Quest

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.

Answer from: Quest

the correct answer in apex is tissue development, i know because i just had this question

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16.
in plant cells, cytokinesis is completed by the formation of a(n)

cell plate.<...