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babunello [35]
3 years ago
13

Which one of the following accurately describes the Lac operon?

Biology
1 answer:
andre [41]3 years ago
5 0

The lac operon, which stands for Lactose operon is known as an inducible system. It is the an operon required for the transport and metabolism of lactose some enteric bacteria (Echerichia coli for example). The Lac operon is only activated in the presence of a key molecule. The key molecule is lactose.
From the given options the following best describes the Lac operon:

D. The repressor is freed from the operator when lactose is present.

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You are a researcher interested in a rare, highly endangered bird species that lives in a very remote area of the Amazonian rain
Likurg_2 [28]

Answer:

- Ecological levels to consider in this study: organism, population and community

- Approach: I would use an observational approach to study this bird species

Explanation:

The levels of the ecological organization include the organism, population, community, ecosystem, and biosphere (from simplest to most complex). In this exploratory study, it is imperative to consider: 1-morphological, physiological and behavioral adaptations of the bird species (i.e., organismal-level), 2- size/density/structure of the bird population (i.e., population-level), and 3-interactions between bird population and other populations (i.e., community-level). The higher ecological levels, i.e., ecosystem-level (relationships between the community and abiotic factors ) and biosphere-level (biosphere =  planet Earth), can be in this case disregarded because this study is centered on a focus bird species. Moreover, it is expected to apply an observational strategy because nothing is currently known about the focus bird species. The experimental and modeling approaches seem more suitable to test a particular hypothesis being discussed (it is not the case for this study).

5 0
3 years ago
Jupiter has a similar composition to the sun. Why is the sun a star while Jupiter is not?
irakobra [83]

The correct answer is (b) Jupiter has mass less than that of sun which cannot generate enough pressure which can start hydrogen fusion. Jupiter has similar composition as both are entirely made up of hydrogen and helium. They both differ in the core and mass. The mass of Jupiter is so small as compared that it would not be able to generate enough pressure to start hydrogen fusion. Jupiter's core is made of metallic hydrogen and the core of sun is so hot that the hydrogen splits into electrons and protons. This generates hydrogen fusion.

Thus, Sun a star and Jupiter is not a star.





5 0
3 years ago
The fossils in the chart can BEST be described as
pickupchik [31]
The answer is A index fossils
6 0
3 years ago
A long-lasting increase in synaptic strength between two neurons is:
bearhunter [10]
Long - term potentiation  ( LTP )


Hope that helps, Good luck! (:

7 0
3 years ago
Many species have embryos that look similar to one another and develop similar structures. Refer to the picture above. During th
Pavel [41]

Answer:

A) Divergent evolution because all of the species have similar structures during the first stage of development.

Explanation:

5 0
3 years ago
Read 2 more answers
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