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miss Akunina [59]
2 years ago
8

I need help on this question help

Biology
1 answer:
anygoal [31]2 years ago
5 0

Answer: the answer is A

Explanation:

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Whats the definition for celsius
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It is the metric unit of measurement for temperature.
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3 years ago
The lactose (lac) operon in E. coli is an example of a repressed gene when lactose is not available in a cell. In 3-5 sentences
irakobra [83]

Answer:

Please find the detailed explanation of this statement below

Explanation:

Firstly, a repressed gene is a gene whose expression has been inhibited or repressed. The lac operon in E.coli bacteria is a regulatory unit containing structural genes, a single promoter and operator regions. The promoter is the region where the transcription enzyme (RNA polymerase) binds to in order to transcribe the genes in the lac operon. The structural genes in the lac operon can only be expressed in the presence of lactose sugar.

However, in the absence of lactose, LAC REPRESSOR, which is a transcription factor (protein), prevents the binding of RNA polymerase to the PROMOTER region by binding to the OPERATOR region of the lac operon. This inhibits the expression of the lactose genes in the operon.

Note that, the structural genes in the lac operon (lacZ, lacY, lacA) code for proteins that help break down lactose sugar for energy in the E.coli bacteria. Therefore, a bacteria cell with a repressed lac operon will be unable to degrade lactose sugar.

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3 years ago
Females of many insect species, including honeybee queens, can store gametes shed by their mating partners in _______. A. their
Anit [1.1K]

In the spermatheca, females of many insect species, including honeybee queens, can store gametes secreted by their sex partners.

<h3>What is Spermatheca ?</h3>

The female insect's spermatheca is an ectodermal structure that receives, stores, and releases sperm for egg fertilization. According to the species, spermathecae differ in size and shape.

  • They often come from the median oviduct, which is located close or on the genital chamber. A secretory duct called the ductus seminalis connects the spermathecal sac, also known as the receptaculum seminis, to the genital chamber, where the sperm are released.
  • The number of spermathecas varies among taxa, however the majority of insects only have one. Depending on the species of insect, the spermatheca has different morphologies. The spermatheca is composed of the spermathecal gland, duct, and reservoir. Both of these fluids feed the sperm. Both the spermathecal glands and the male accessory glands secrete substances that feed the sperm.

So lastly we can say that, t females of many insect species, including honeybee queens, can store gametes shed by their mating partners in - the spermatheca.

To know more about Spermatheca please click here : brainly.com/question/9748392

#SPJ4

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1 year ago
In the definition of psycholgy, the term mental processes refers to,
Sonja [21]

Answer:

Mental process is a term used for the things that an individual can do with their minds; perception, memory, thinking, volition, and emotion. Cognitive function is sometimes used instead.

8 0
3 years ago
How do tariffs work to protect infant industries?
andrey2020 [161]
<span>Tariffs shield new industries in the early stages of their development from the competition of more mature rivals.</span>
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