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ss7ja [257]
4 years ago
9

Scientists construct an experimental bacteriophage that is composed of the T2 phage protein coat and T3 phage DNA. If a bacteriu

m is infected by this phage, the new phages produced would be expected to have:
Biology
1 answer:
madam [21]4 years ago
6 0
<h2>T4 protein and T4 DNA</h2>

Explanation:

  • A bacteriophage is an infection that attacks bacteria. At the point when the tail strands identify an objective host the bacteriophage  to the cell, injected  its DNA, and utilizations the microscopic organisms' apparatus to reproduce.<em> </em>
  • <em>T4 is a sort of bacteriophage that infects of  E. coli.  </em>
  • The bacteriophage T4 capsid is a prolonged icosahedron, 120 nm long and 86 nm wide, and is worked with three essential proteins such as  gp23*, which shapes the hexagonal capsid cross section, <em>gp24*, </em>which structures pentamers at eleven of the twelve vertices.
  • <em>gp20, </em>which frames the extraordinary dodecameric entry vertex through which DNA.  
  • T4 DNA Ligase is ligation catalyst which utilized the parts of DNA by the catalyzing between  <em>compared 5'phosphate and 3' hydroxyl ends</em> and phosphodiester bonds in the double stranded DNA  utilizing ATP as a coenzyme.

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A cell has damaged DNA, which checkpoint is responsible for checking this? A: m checkpoint B: G2 checkpoint C: G1 checkpoint
ankoles [38]
The answer is <span>B: G2 checkpoint.

</span>

<span>Cell cycle checkpoints are control mechanisms necessary for proper cell division. In the cell cycle, there are two checkpoints: the G1 checkpoint and the G2 checkpoint. The G1 checkpoint is right before the S phase, and G2 checkpoint is right before the M phase.
</span><span>The G2 checkpoint is a DNA damage checkpoint and if DNA is damaged, entering the cell cycle is delayed before mitosis (M phase).</span><span>
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8 0
3 years ago
Read 2 more answers
A mixture can be separated by all of the following EXCEPT
serg [7]

Answer:

All are methods to separate mixtures

Explanation:

<em>A mixture consists of 2 or more substances that are mixed physically but not chemically. Hence, mixtures can be separated by any physical separation means which include but not limited to filtration, distillation, sieving, magnetization, and evaporation.</em>

Filtration is usually used to separate suspended particles in a liquid using a membrane of a filter paper. Distillation is used to separate miscible liquids with varying boiling points by evaporating and condensing them back at their respective boiling points. Sieving is used to separate mixtures with varying particle sizes of individual components.

Magnetization is usually used to separate mixtures with, at least, one component with magnetic property. Evaporation is used to separate dissolved solids from liquids.

<u>Hence, all the methods listed are used to separate mixtures.</u>

4 0
3 years ago
The trp and lac operons are regulated in various ways. How do bacteria regulate transcription of these operons? Sort the stateme
OLEGan [10]

Answer:

Operon is not transcribed:

-lac operon: lactose absent

-trp operon: tryptophan present

Operon is transcribed, but not sped up through positive control:

-lac operon: lactose and glucose present

-trp operon: tryptophan absent

Operon is transcribed quickly through positive control:

-lac operon: lactose present, glucose not

Explanation:

The trp operon is controlled via negative control only.

Presence of tryptophan will inhibit the transcription of the operon genes

The lac operon is controlled via negative control and positive control.

●Negative control:

--Transcription is turned off due to

active Repressor protein and absence of lactose

--Transcription is turned on due to

Inactive Repressor protein and presence of lactose

●Positive control:

--Transcription rate is higher due to absence of transcription and presence of lactose as a regulatory protein (CAP) adhere to the lac operon promoter

8 0
3 years ago
What is the purpose of the part of the female reproductive system highlighted below ?
Serhud [2]

Answer:

A collecting sperm.

Explanation:

its cannot transport eggs, nor does it develope a fetus ,the fetus is delveoped in the womb   while eggs are stored in the ovaries

3 0
3 years ago
Apoptosis differs from necrosis in that necrosis:_______ a. requires the reception of an extracellular signal. b. causes DNA to
mote1985 [20]

Answer:

c. causes cells to swell and burst, whereas apoptotic cells shrink and condense

Explanation:

These two mechanism are responsible for death of cells in multi cellular organisms.Apoptosis is  naturally occurring process which is well organised and programmed.It is ensures the  automatic death of old and worn out cells, needed for certain cellular developments. This is demonstrated by DNA fragmentation,cell shrinkage,and the break down of the nuclear walls.It can be initiated through two pathways of intrinsic and extrinsic,The latter leads to death from internal factors,while in the former is when external factor causes the death .

However,when cell death is influenced by external factors(toxins)  in the cell environments,which lead to unpredictable or unregulated process leading to cell death ,the process is called Necrosis.it is demonstrated with the swelling and busting of the cell.and characterised with inflammation. It is an accidental death which causes injuries to the cells and tissues.

7 0
3 years ago
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