Answer:
lungs:
The blood first enters the right atrium.
The blood then flows through the tricuspid valve into the right ventricle.
When the heart beats, the ventricle pushes blood through the pulmonic valve into the pulmonary artery.
The pulmonary artery carries blood to the lungs where it “picks up” oxygen.
It then leaves the lungs to return to the heart through the pulmonary vein.
The blood enters the left atrium.
It drops through the mitral valve into the left ventricle.
The left ventricle then pumps blood through the aortic valve and into the aorta. The aorta is the artery that feeds the rest of the body through a system of blood vessels.
Blood returns to the heart from the body via two large blood vessels called the superior vena cava and the inferior vena cava. This blood carries little oxygen, as it is returning from the body where oxygen was used.
The vena cavas pump blood into the right atrium and the cycle begins all over again.
<span>DNA, also known as deoxyribonucleic acid, belongs to a class of polymeric organic macromolecules called nucleic acids.
The only other member of this class is ribonucleic acid, or RNA.
Nucleic acids were first discovered in 1869 by the Swiss scientist
Friedrich Miescher.
</span>
<span>DNA and RNA play
important roles as genetic information carriers in biology, enabling the
mechanisms of heredity and protein synthesis. Nucleic acids are
polymers of nucleotides, which are composed of a five-carbon sugar, also
called a pentose sugar, a nitrogenous base and a phosphate group. The
sugar is deoxyribose, in the case of DNA, and ribose, in the case of
RNA.</span>
Answer:
A.) Sexual reproduction
Explanation:
Asexual reproduction produces less variations and requires only one parent causing the offspring to be almost identical to the parent.
Sexual reproduction includes two parents and each parent contribute genetic material to the offspring, meaning that the offspring will have some traits of the mother and some of the father, creating a new person.
Answer:
RNA sequence- 5' AUG 3',
tRNA anticodon- 3' UAC 5'
Amino acid- methionine
Explanation:
DNA contains two strands of sense and antisense. The mRNA sequence is produced by the antisense strand of DNA. So if the DNA sense strand has ATG sequence then according to the complementary base pairing the sequence against it would be 3' TAC 5'.
In RNA in place of thymine, Uracil comes so here according to complementary base pairing rule the sequence of codon in RNA would be 5' AUG 3'. As tRNA contains anticodon sequence which is complementary to mRNA codon sequence therefore the anticodon sequence would be 3' UAC 5'.
Every triplet codon in mRNA codes for a particular amino acid and AUG codon is called start codon which codes for methionine. So methionine would be added against AUG codon.
Answer:
If you cut a starfish radially (cut passing through the centre of the body) in five parts, every part will regrow into a new fully developed star fish.
