How do mutated tumor suppressor genes affect the cell cycle?

1 answer:

8 0

Tumor suppressor genes encode for proteins that inhibit or slow the progression of the cell cycle through a specific stage.they also encode for check point control proteins that arrests the cell cycle if the DNA is damaged or the chromosomes are abnormal. Mutation in the tumor suppressor genes that cause a loss or decreased function would lead to uncontrolled cell cycle leading to abnormal proliferation and the cell may become cancerous.

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An element's atomic number is 49. How many electrons would an atom of this element have?

erma4kov [3.2K]

49; Number of Electrons = Number of Protons = Atomic Number

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2 years ago

Both myoglobin and hemoglobin exhibit cooperative binding to oxygen. True or False

lys-0071 [83]

Answer:

False.

Explanation:

An Haemoglobin molecule is made up of 4-polypeptides, with each of the polypeptide chain containing an haem group. These haem group can bind with one oxygen atom each.

The binding of the first oxygen atom by the first haem group weakens the tertiary protein structure of Quaternary structure Hb, thus it makes it easier for the second Oxygen atom to bind faster, and the 3rd oxygen very fast and the 4th oxygen atom the fastest.These accelerated binding of the oxygen atoms, facilitated by the first binding O2, is called cooperative binding.It aids oxygen binding capacity and tranport functions of Hb,

Myoglobin is an oxygen storage protein in muscles, and not oxygen carrying molecule, It releases stored O2 only in condition of low oxygen supply.It has one haem group in its molecule.Therefore its structural features can not carry out cooperative binding.

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2 years ago

The main function of this macromolecule is to: jobs in your cells such as building and breaking down molecules.

enot [183]

Answer:

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Explanation:

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2 years ago

Somatic cells of chimpanzees contain 48 chromosomes. how many chromatids and chromosomes are present at (a) anaphase of mitosis,

IgorLugansk [536]

(a) anaphase of mitosis, 96 chromosomes, 96 chromatides

(b) anaphase i of meiosis, 48 chromosomes, 96 chromatides

(d) g 1 prior to mitosis, 48 chromosomes, 48 chromatides

(e) g 2 prior to mitosis, 48 chromosomes, 96 chromatides

(f) g 1 prior to meiosis i, 48 chromosomes,48 chromatides

(g) prophase of meiosis I – 48 chromosomes, 96 chromatides

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Do pteridophytes bear seeds?

MA_775_DIABLO [31]

Answer:

pteridophyte is a vascular plant (with xylem and phloem) that disperses spores. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden.

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