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3 years ago

How many sex chromosomes do humans possess? a. 2 b. 22 c. 23 d. 46

1 answer:

6 0

a. 2 > The 23rd pair, the sex chromosomes, differ between males and females (females have two copies of the X chromosome, while males have one X and one Y chromosome). In humans, the sex chromosomes comprise one pair of the total of 23 pairs of chromosomes. The other 22 pairs of chromosomes are called autosomes. <em>Chromosomes are thread-like molecules that carry hereditary information (they are made of protein and one molecule of DNA, which contains an organism's genetic instructions).</em>

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How dose the nervous system help the body maintain homeostasis

jeka94

Answer:

The nervous system helps the body to maintain homeostasis by controlling and regulating the other parts of the body.

8 0

3 years ago

The hippocampus, hypothalamus, and amygdala are all parts of the _____ system.

Alborosie

<span>Lymbic syste. These three parts are seen under the cerebrum as on both sides of thalamus. The function of these parts include controlling memories and emotions. It is a complex system of neurons. Hypothalamus is concerned primarily with homoeostasis, Hippocampus is the centreof memories and amygdala is sudden responses.</span>

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3 years ago

The proccess of photosynthesis can be represented by the chemical formula _________

masya89 [10]

Answer:

6H2O + 6CO2 ----- C6H1206 + 6O2

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2 years ago

Arrange these groups in order from most inclusive (most general) to least inclusive (most specific).

LUCKY_DIMON [66]

These groups are arranged in order from most inclusive (most general) to least inclusive (most specific) is gnathostomes, osteichthyans, lobe-fins, tetrapods, amphibians.

<h3>What is gnathostomes?</h3>

The jawed vertebrates are called gnathostomata. The phrase comes from the Greek words "jaw" and "mouth." Approximately 60,000 species make up the diversity of the gnathostome, which represents 99% of all vertebrates still alive today.

<h3>What is osteichthyans?</h3>

A broad taxonomic group of fish called osteichthyes, also known as the "bony fish," has skeletons that are predominantly made of bone tissue.

The taxon Sarcopterygii, also known as Crossopterygii, is made up of bony fishes noted for having lobe-finned fishes as its members.

<h3>What is tetrapods?</h3>

Four-legged vertebrates that make up the superclass Tetrapoda are known as tetrapods, which derives from the Ancient Greek (tetra-) "four" and "foot." It consists of synapsids, dinosaurs, and extinct as well as living amphibians, reptiles, and dinosaur-related birds (including mammals).

To learn more about Tetrapods visit:

brainly.com/question/15289594

#SPJ4

8 0

1 year ago

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!

3 0

3 years ago