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hjlf
3 years ago
12

By what 2 different mechanisms could mutant phages change to become capable of lysing e. coli k

Biology
1 answer:
Agata [3.3K]3 years ago
4 0

The switching from lysogenic to the lytic cycle, also called lysogenic induction, can be caused by a double-stranded break in the prophage or can be caused by a mutagen. These factors could cause disruption of the cI & cro genes that are responsible for regulating the lytic-lysogenic cycles of bacteriophages..


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6. Which of the following is NOT related to
kotykmax [81]

Answer:

pretty sure its D!

Explanation:

Because Camouflage isn't related to comparative anatomy. If this is incorrect, sorry!

4 0
3 years ago
We are studying 3 strains of bacteria, with populations p1, p2, p3, in an environment with three food sources, A, B, C. In a day
Nastasia [14]

Answer:

The population of each bacteria in 1, 2, 3 are 12, 8, and 7 respectively.

Explanation:

From the given information:

For  food source A; we have:

3P₁ + P₂ + 2P₃ = 58    units of food A ---- (1)

For food source B; we have:

2P₁ + 4P₂ + 2P₃ = 70   units of food B  ---- (2)

For food source C; we have:

P₁ + P₂  = 20   units of food C    ----- (3)

From equation (1) and (2); we have:

3P₁ + P₂ + 2P₃ = 58

2P₁ + 4P₂ + 2P₃ = 70

By elimination method

 3P₁ + P₂ + 2P₃ = 58

-

 2P₁ + 4P₂ + 2P₃ = 70

<u>                                       </u>

<u> P₁  -   3P₂   + 0    = - 12    </u>

P₁ = -12 + 3P₂   ---- (4)

Replace, the value of P₁  in (4) into equation (3)

P₁ + P₂  = 20

-12 + 3P₂ + P₂  = 20

4P₂ = 20 + 12

4P₂ = 32

P₂ = 32/4

P₂ = 8

From equation (3) again;

P₁ + P₂  = 20

P₁ + 8 = 20

P₁  = 20 - 8

P₁  = 12

To find P₃;  replace the value of P₁ and P₂ into (1)

3P₁ + P₂ + 2P₃ = 58

3(12) + 8 + 2P₃ = 58

36 + 8 + 2P₃ = 58

2P₃ = 58 - 36 -8

2P₃ = 14

P₃ = 14/2

P₃ =  7

Thus, the population of each bacteria in 1, 2, 3 are 12, 8, and 7 respectively.

4 0
3 years ago
I’ll mark brainliest pls help ❤️
arsen [322]

Answer:

1. Radiometric dating

2. Relative dating is used to determine the age of fossils or rock layers by by comparing it to similar rocks and fossils of known ages.

3. The youngest rock layers are at the top and the oldest are at the bottom, which is according to the law of superposition.

4. Tribolite and Pecten fossils

Fossils are used to determine the ages of rock layers. Index fossils are the most useful in determining relative aging. Index fossils are of organisms that lived for a short period of time. An index fossil allows a scientist to determine the age of the rock it is in. So if they are found in a particular age, it means they belong in that age.

5. Scientists commonly use radioactive dating methods by using radioactive decay cloak of certain elements such as potassium or carbon to date fossils or rocks.

6. Law of superposition because in terms of finding the age of the rock as an object, all that needs to be identified are the layers of the rock.

7. The nuclear decay of radioactive elements are a process that behaves in a clock-like fashion which makes it a useful tool for determining the exact age of fossils or rocks.

4 0
3 years ago
Hunger researchers initially assumed that the _____________ was a brain region responsible for initiating hunger and eating beca
qaws [65]

Answer:

Lateral Hypothalamus

Explanation:

According to the hunger researchers' initial assumption lateral hypothalamus is that part of the brain which regulates intake of food and metabolical activities like metabolical regulation of peptides like  the orexins melanin-concentrating hormone. It is that part of the brain that plays a key role in the ingestive behavior regulation.

The lateral hypothalamus system initiates physical and cognitive processes like it promotes arousal and feeding behavior, metabolism, regulates body temperature, BP, etc. and when stimulated it results in the feeding behaviour in animals as they begin to eat.

4 0
3 years ago
In blood types, a person can have type A, type B, type AB or type O blood.
zubka84 [21]

Answer:

Possible blood type of their children is type A and type B blood

Explanation:

A person can have type A, type B, type AB or type O blood.

A woman who has type AB blood marries a man with type O blood.

Parents                        AB     x     OO

Possible genotypes        AO     BO

Possible blood type of their children is type A and type B blood

7 0
3 years ago
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