All categories

3 years ago

Which era lasted from 542 to 251 mya

Biology

1 answer:

olchik [2.2K]3 years ago

6 0

Paleozoic era is the answer

You might be interested in

Hijra, xanith, and berdache are all examples of a __________.

stiks02 [169]

Hijra, xanith, and berdache are all examples of a the third gender, they can be dressed like women but be men. Hijra in Hindi is referred to the third gender, xanith also is the same and berdache alludes to a t<span>wo Spirits Native American Tribes. Eunuch is the most close English word for such people though it is primarily used for castrated men. </span>

4 0

3 years ago

Viruses can be transmitted through air, water food, insect bites, and direct skin contact. Once a virus gains entry to the body,

lianna [129]

Answer:

Explanation:

When it comes into contact with a host cell, a virus can insert its genetic material into its host, literally taking over the host's functions. An infected cell produces more viral protein and genetic material instead of its usual products.

6 0

3 years ago

7. Why do plants need nitrate ions?

V125BC [204]

$\huge{\mathfrak{\purple{Question}}}$

Why do plants need nitrate ions?

$\huge{\mathfrak{\purple{Answer}}}$

For making amino acids ( Option A )

$\huge{\mathfrak{\purple{Explanation}}}$

The plants need nitrate ions for <u>making amino acids</u>

#HopeItHelps

6 0

3 years ago

Fill in the blank with the correct word.

adell [148]

It is photoperiodism

3 0

4 years ago

The trp and lac operons are regulated in various ways. how do bacteria regulate transcription of these operons?

Vlada [557]

Operon is not transcribed:

-lac operon: lactose absent

-trp operon: tryptophan present

Positive control transcription of Operon does not speed it up:

Lactose and glucose are present, -lac operon

Tryptophan is lacking in the -trp operon.

Operon is transcribed quickly through positive control:

-lac operon: lactose present, glucose not

Only negative control is used to regulate the trp operon. The operon genes are not transcribed when tryptophan is present.

Both positive control and negative control are used to control the lac operon.

Negative control: —Transcription is inhibited when lactose is missing due to the activity of the repressor protein.

—The repressor protein is deactivated and transcription is triggered when lactose is present.

Positive control: —In the absence of glucose, another regulatory protein (CAP) attaches to the lac operon's promoter, speeding up transcription in the presence of lactose.

Learn more about lac operons here:

brainly.com/question/1695549

#SPJ4

7 0

2 years ago