To be a useful index fossil, the organism should have been rare when it lived on Earth.

1 answer:

4 0

True because of the fact that index fossils help correlate and date from its origin and date of existence. basically, it is a fossil that is kept and annalized.

You might be interested in

How fast can superworms decompose in soil?

cluponka [151]

<span>Superworms must be isolated and placed in complete darkness to pupate, all cooling does is kill them</span>

4 0

3 years ago

Read 2 more answers

Is/are used in chronic pain management, to treat attention deficit hyperactivity disorder, and as a treatment for bedwetting. be

zloy xaker [14]

The correct answer is tricyclic antidepressants.

Tricyclic antidepressants (TCAs) are mainly subscribed for treating depression, however they are also commonly used to treat attention-deficit hyperactivity disorder and chronic pain. Also, TCAs are used for the treatment of enuresis, also known as bedwetting.

Benzodiazepines is a type of psychoactive drugs commonly used to treat anxiety, panic disorder, generalized anxiety disorder, insomnia, seizures and alcohol withdrawal.

Selective serotonin reuptake inhibitors is a class of antidepressants used to tread depression, obsessive-compulsice disorder, generalized anxiety disorder and eating disorders.

Monoamine oxidase inhibitors are mainly used to treat depression but also panic disorder.

7 0

3 years ago

Read 2 more answers

Need a hypothesis for “How are proteins built from RNA”

Dima020 [189]

Hi!

Hypothesis:

<em>Proteins are built from the translation of messenger RNA (mRNA) molecules</em>

RNA, or ribonucleic acid, is a structure that is similar to DNA, except that it exists as a single strand, consists of a ribose sugar instead of a deoxyribose sugar and has the base uracil (U) instead of thyamine (T).

RNA is generated through transcription of the DNA molecule, resulting in a <em>complementary </em>molecule of the template DNA strand. For instance, if the sequence of the DNA was:

ATGCGCAGTTATTGCGAT

The corresponding RNA sequence will be:

UACGCGUCAAUAACGCUA <em>(complementary with U instead of T)</em>

<h3><u>From RNA to Protein</u></h3>

The RNA molecule in our case is known as the mRNA. After transcription the mRNA molecule is transported to the cytoplasm, where a ribosome binds to it for another molecule to translate the sequence. This translation is mediated by an RNA molecule known as the tRNA molecule which enters the ribosome to catalyze the reaction.

These molecules identify a sequence of 3 bases (codon) and for specific codon sequences, the tRNA allocates specific amino acid. For instance, for the codon <em>UCA</em>, the tRNA will allocate a <em>Serine residue.</em>

This translation process starts at specific three base sequences, known as start codons, and terminates at specific three base sequences known as stop codons.

In this manner, a sequence of amino acids respective to the mRNA codon sequence is synthesized, and as we identify proteins as chains of amino acids that are covalently linked together through peptide bonds, we can clearly see that proteins are built directly from RNA, and indirectly from DNA.

Hope this helps!