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3 years ago

What are three facts about hydrogen

2 answers:

7 0

Hydrogen is the lightest element on the periodic table of elements. Hydrogen gas is always bonded to itself or something else to fill its outer shell. That is why hydrogen gas is represented as H2. Hydrogen is odorless, colorless, and tasteless; therefore, it is undetectable by human senses.

S_A_V [24]3 years ago

4 0

Lightest element of the periodic table

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All species are either ____________ or ______________. Please choose the correct answer from the following choices, and then sel

pshichka [43]

Answer:

extant; extinct.

Explanation:

A species is a group of individuals that can interbreed to produce fertile and viable progeny. A species may be present on the earth and is surviving or may not be present now on the earth and have become extinct due to one or more reasons. Extant species are the species living on the earth in the present time while extinct species do not exist now. For instance, Plateosaurus engelhardti is a species of dinosaurs that survived on the earth during the Triassic period but does not exist now. On the other hand, Homo sapiens, Apis indica are some of the examples of the extant species that are surviving on the earth.

8 0

3 years ago

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. if blue eyes a

Pavel [41]

4 different phenotypes may be produced. If you write this down in a Punnet square you can get the exact ratio and the genotypes along with the phenotypes.

Let us assign B for brown eyes, b for blue eyes; H for right-handed, h for left-handed.
The mother's genotype will then be bbhh
The father's genotype will then be BbHh

bh bh bh bh
BH BbHh   BbHh BbHh   BbHh
Bh Bbhh Bbhh    Bbhh   Bbhh
bH bbHh bbHh    bbHh   bbHh
bh bbhh bbhh bbhh bbhh

Now based on that you can see that there are 4 possible genotypic combinations which would express different phenotypic combinations as well.

BbHh: Brown-eyed, right-handed
Bbhh: Brown-eyed, left-handed
bbHh: Blue-eyed, right handed
bbhh: Blue-eyed, left-handed

So again, there would be 4 possible phenotypes.

3 0

4 years ago

Gel electrophoresis separates DNA molecules on the basis of size. Which of the following DNA molecules would move the slowest? (

Papessa [141]

Answer:

Option C

Explanation:

DNA fragments have negative charge and they move towards the positively charged electrode in gel electrophoresis.

There is no difference in the charge carried by the DNA fragments as they all have the equal amount of charge on them.

The difference in speed of large and small molecules of DNA is due to their sizes.

Large DNA molecules do not pass easily through the pores of the gel while the smaller molecules do not face any such hindrance and are easily passed through the gel . Therefore small DNA molecules move faster.

F plasmid has the largest size and hence it will move slowly.

Option C is correct

5 0

4 years ago

Question 7

german

Answer:

$\boxed {\boxed {\sf A. \ Synthesize \ proteins}}$

Explanation:

The ribosomes are small organelles made of RNA and proteins. Its function is the same in both prokaryotic and eukrayotic cells: protein synthesis.

The process begins in the nucleus. The DNA and genetic information is housed here. Certain sections are transcribed and copied to make messenger mRNAs that can fit through the nucleus and pores to travel out to the ribosomes.

The ribosomes use the mRNA in a process called translation. They match each set of 3 nucleotides (a codon) in the mRNA to 1of 20 different amino acids. A special sequence of amino acids forms, the molecule folds, and a protein is formed.

So, a ribosome is the main site for protein synthesis and the correct choice is A.

4 0

3 years ago

Hormones regulate certain activities of the immune system. a. True b. False

ycow [4]

Answer:

True

Explanation:

Because thyroide gland's secretion thyroxin regulates immune system in our body

3 0

3 years ago