A paragraph on the origin of life

1 answer:

5 0

The origin of life on Earth is a set of paradoxes. In order for life to have gotten started, there must have been a genetic molecule something like DNA or RNA capable of passing along blueprints for making proteins, the workhorse molecules of life. But modern cells can’t copy DNA and RNA without the help of proteins themselves. To make matters more vexing, none of these molecules can do their jobs without fatty lipids, which provide the membranes that cells need to hold their contents inside. And in yet another chicken-and-egg complication, protein based enzymes, encoded by genetic molecules, are needed to synthesize lipids.

You might be interested in

Roger sperry conducted important research in what field of study?

icang [17]

Split-brain patients

6 0

3 years ago

A climax community will persist until it is altered by-

Bad White [126]

The answer would c.

8 0

3 years ago

The plane that separated the body into superior and inferior portions is a sagittal plane.

dybincka [34]

Answer: False

Explanation:

The saggital plane divides the body into two halves based on the fact that the body is segmented into left and right planes.

The plane may be away or at can lie at the center of the body and it splits the body into parts. It may be far or close to the midline of the body. It may also split the body into two unequal parts.

The term saggital is coined by Gerard Cremona.

7 0

3 years ago

During which stage does a cell experience growth and chromosome replication?

statuscvo [17]

S phase for mitosis. so yea

7 0

3 years ago

Steroid hormones exert their action by ________. A. entering the nucleus of a cell and initiating or altering the expression of

Blizzard [7]

Answer:

The correct option is A. Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.

Explanation:

Steroid hormones are derived from cholesterol and regulate multiple biological processes. All steroid hormones exert their action by crossing the plasma membrane and by binding with their respective intracellular receptors. They stimulate cell growth in a very different way, their lipophilic nature gives them the ability to cross lipid barriers, so, without the need for extracellular signals, these hormones can easily enter the cell, cross the cytoplasm and reach the nucleus. There they bind to specific receptors that are associated with DNA promoter regions, modifying their structure and promoting the expression of the genes under their control.

5 0

4 years ago

A paragraph on the origin of life​

A paragraph on the origin of life