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2 years ago

The four main types of macromolecules are organic. what does organic mean in this context.

Biology

2 answers:

Murrr4er [49]2 years ago

8 0

A is the right answer because it’s only made up of carbon

Alexxandr [17]2 years ago

4 0

The correct answer is A.

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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:

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1 year ago

Why is it necessary for oceanographers to analyze river pollution levels?

marissa [1.9K]

Rivers usually empty into oceans. Any pollution deposited or pick-up by the river, will eventually end up in the ocean.

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3 years ago

Suppose that a dominant allele (P) codes for a polka-dot tail and a recessive allele (p) codes for a solid colored tail. In addi

Amiraneli [1.4K]

I believe the answer is c) 9:3:3:1 ratio (9 polka-dot tails and short eyelashes, 3 polka-dot tails and long eyelashes, 3 solid tails and short eyelashes 1 solid tail and long eyelash)

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3 years ago

The idea that, when life originated on earth, a macromolecule other than dna served the role of information storage and that thi

svet-max [94.6K]

The RNA world hypothesis states that the earlier life-forms had relied only on RNA (Ribonucleic Acid) for the purpose of catalyzing the chemical reactions, and storing the genetic information. This hypothesis was proposed by Leslie Orgel, Carl Woese, and Francis Crick.

This hypothesis states that long before the living forms evolved to use DNA as the genetic storage material, the RNA molecules served the purpose of both storing the genetic information and carrying out catalysis, but because of its instability, DNA evolved.

Hence, the answer is RNA world hypothesis.

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3 years ago

What important role does fire play in a grassland biome?

Alenkinab [10]

Fire naturally occurs in a grassland ecosystem and it helps the environment stay healthy and strong. I promotes richer soil as well as gets rid of excess leaves scattered around. After a fire, grassland ecosystems can grow again and be better than they were before.

6 0

3 years ago

Read 2 more answers