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yulyashka [42]
3 years ago
14

Many bacteria, including E. coli, are capable of growing under both anaerobic and aerobic conditions. Some mutations are introdu

ced into an E. coli strain that inactivate several enzymes involved in DNA repair. The mutant strain grows normally when kept in an incubator with a 100% nitrogen gas atmosphere. However, the strain dies when exposed to a normal laboratory atmosphere. Why
Biology
1 answer:
Sloan [31]3 years ago
5 0

Answer:

Due to inability to survive in aerobic condition.

Explanation:

The strain dies when exposed to a normal laboratory atmosphere instead of nitrogen gas atmosphere because the mutation causes change in the capability of the strain to survive in the aerobic conditions. This mutation inactivate several enzymes which is also responsible for their capabilities of surviving under both anaerobic and aerobic environment so that's why the strain dies when exposed to normal atmosphere..

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Part A: If one follows 70 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes wou
olga nikolaevna [1]

Answer:

<u>Part A</u> : 70 secondary oocytes will be formed.

<u>Part B</u> : 70 first polar bodies will be formed.

<u>Part C</u> : 70 ootids will be formed.

Explanation:

During oogenesis growth maturation of a single oogonium produces one primary oogonium.

the primary oogonium then undergoes meiosis -1 and produces  one secondary oocyte and first polar body.

The secondary oocyte then undergoes meiosis - 2 and forms an ootid and second polar body.

The ootid then differentiates into the ovum.

As in the above scenario , 70 primary oocytes are present , they undergo meiosis-1 and produces 70 secondary oocytes and 70 first polar bodies. Hence answers of part A and B is 70.

As 70 secondary oocytes are formed , they undergo meiosis -2 and forms 70 ootids which then differentiate in 70 ovums.

8 0
3 years ago
Which substance cannot be broken down into simpler substances?
Readme [11.4K]

Answer:

A Elements

Explanation:

Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.

6 0
2 years ago
Why is semi-conservative important
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The importance of the semi-conservative model is unhealthy old and new genes cancel each other. The result new cells are disease and mutation free. ... DNA replication is semiconservative because DNA is composed of two complementary strands, each of which acts as template to construct a new strand complementary to itself.
6 0
3 years ago
A painter falls from his ladder and tells you he has dislocated his shoulder again. When you attempt to splint the shoulder, it
Murljashka [212]

Answer:

The options

A. Contact medical control for input into the best treatment for this patient.

B. Check distal CSM, apply a sling and swathe, and transport the patient.

C. Check distal CSM, apply a traction splint, and transport the patient.

D. Continue splinting and report the popping sound to the triage nurse when you arrive at the hospital.

The ANSWER IS SURELY B.

B. Check distal CSM, apply a sling and swathe, and transport the patient.

Explanation:

In assessing Musculoskeletal Injury as in this case, check for Circulation, sensation, and movement, apply a sling and bandage/swathe followed by transporting the patient quickly to the hospital for further checkup

3 0
3 years ago
3 examples of producers and 3 examples of consumers
VikaD [51]

Explanation:

whales, elephants, cows, they are consumers

tree,grass,algae are producers

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