Search our library of Biology questions

Top answers

Biology

All levels

Can you explain the different types of protein structure? (primary, secondary, tertiary and quaternary)

The primary structure of a protein is the sequence of amino acids found in the polypeptide chains, this sequence determines the shape and properties of the protein.The secondary structure of a protein is ...

Answered by Flora B. • Biology tutor

2647 Views

(a) (i) Give a biological molecule that contains: 1. nitrogen 2. phosphorous (ii) Describe the role of microorganisms in producing nitrates from the remains of dead organims.

(i) 1. amino acid 2. DNA(ii) Decomposer microrganisms break down dead material into ammonia. Ammonia is then converted into nitrite and then oxidised to nitrate by nitrifying bacteria. The process is know...

Answered by Alice S. • Biology tutor

7171 Views

Describe How Speciation Occurs Through Sympatric/Allopatric Speciation and What Are the Differences Between the Methods?

The main difference to consider would be that sympatric speciation occurs in the same habitat and population while allopatric speciation requires a geographical barrier between subsets of the population. ...

Answered by Rana E. • Biology tutor

2835 Views

In DNA, what bonds form between the nitrogenous bases

Hydrogen bonds.

Answered by Rochelle S. • Biology tutor

2035 Views

Describe the cardiac cycle, referring to the valves of the heart.

Deoxygenated blood enters the right atrium of the heart via the superior & inferior vena cavae. The atria contract and the right atrioventricular valve opens, allowing the blood to enter the right ven...

Answered by Thomas R. • Biology tutor

1971 Views