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musickatia [10]
2 years ago
5

A particular cell type spends 4 hours in G1 phase, 2 hours in S phase, 2 hours in G2 phase, and 30 minutes in M phase. If a puls

e-chase experiment was performed with radioactive thymidine on an asynchronous culture of such cells, what percentage of mitotic cells would be radiolabeled 9 hours after the pulse
Biology
1 answer:
V125BC [204]2 years ago
4 0

Answer:

<h2>0%.</h2>

Explanation:

1. As given, cell cycle is of 8.30 hours.

G1 phase= 4 hours;

S phase= 2 hours;

G2 phase = 2 hours;

M phase= 30 minutes.

2. Adding up each phase shows that the cell cycle is 8.5 hours long. As after 9 hours, the radio labeled cells would have passed through a full cycle ( from G-1 to m phase) and be in either S phase or G2- phase and  none cell  would have entered M Phase.

3. DNA  synthesis occurs only in S-phase, so the incorporation of any radioactive nucleotide happens in S-phase only.

4. M phase, cell divide itself into two daughter cells.

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The two principal ways to describe Earth’s structure are based on the _______.
Ann [662]
 believe the correct answer from the choices listed above is option A. The two principal ways to describe Earth’s structure are based on the chemical composition and thickness of layers. Since Earth is a layered structure, it is viewed according to its different chemical composition and the thickness.
7 0
2 years ago
Read 2 more answers
Explain what friction corollas and a low pressure gradient does to an air parcel?
Kipish [7]

Answer with Explanation:

Coriolis Force - refers to the fictitious force that acts perpendicularly to the direction of a rotating motion.

Air parcel - refers to a body of air that is <em>"imaginary."</em>

Pressure gradient - the change in pressure across a given distance.

Pressure gradient force - the net force that is being directed from high pressure to low pressure.

When an<em> air parcel is at rest, </em><u>the pressure gradient force acts upon it.</u> It will then move from<em> high pressure to low pressure.</em>

However, when the air parcel starts to be in motion, its direction will be changed with the help of the Coriolis force. Thus, it moves to the right side of the Northern hemisphere.

Once the speed of the wind increases, the change in direction of the air parcel increases. This happens until the pressure gradient force and the Coriolis Force are equal in magnitude. When this happens, the wind will start blowing parallel to the points of equal pressure. The wind will now then be referred to as in "geostrophic balance."

When friction happens, the geostrophic balance breaks. The flow of the wind will be slowed down. This means that the Coriolis force will also be lessened. The air parcel will then move towards the lower region.

6 0
2 years ago
Skin color in a certain species of fish is inherited by a single gene with four different alleles. How many different types of g
k0ka [10]

Answer:

4

Explanation:

According to Mendel's law of purity of gametes, each gamete contains single allele for a gene. The alleles of a gene segregate during gamete formation and each gamete has one allele for a gene irrespective of the total number of alleles for a gene.  

If the gene for skin color in a fish species has four alleles, an individuals fish would have only two alleles which in turn would segregate during gamete formation.

Since there are four different alleles of the gene (let's assume a,b,c, and d), total possible gametes produced by this organism will be = 4. A gamete can have one of the total 4 alleles making total 4 types of the gametes each with a or b or c or d allele.  

5 0
2 years ago
What is the best evidence for a three-domain system?
ch4aika [34]

Answer:

The best evidence for the three domain system is

Sensitivity to Antibiotics

Explanation:

The three domains of life includes :

Archaea - oldest known domain, ancient forms of bacteria.

Bacteria - all other bacteria that are not included in the Archaea domain.

Eukarya - all the organisms that are eukaryotic or contain membrane-bound organelles and nuclei.

Types of evidences for the three domain system are:

1) differences in the sequences of nucleotides in the cell's robosomal RNAs (rRNA)

2) the cells's membrane lipid structure.

3) its sensitivity to antibiotics.

8 0
2 years ago
How do day-neutral and intermediate-day photoperiod plants differ in their requirements?
Anastasy [175]

Answer:

Photoperiod signifies towards the time that an animal or a plant gets exposed to light in a twenty-four-hour duration. Different types of plants need different durations of light exposure to follow their respective life cycles.  

On the basis of getting exposed to light differently, the plants are differentiated into short-day plants, long-day plants, day-neutral plants, and intermediate-day plants. The day-neutral plants will undergo flowering at any length of the day, given that there is the availability of minimum amount of light, which is essential for usual growth. For example, beans, tropical plants, cotton, and others.  

On the other hand, the intermediate-day plants will not flower if the days are too long or too short, like different varieties of grasses.  

6 0
2 years ago
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