Molecular Biology and Chemistry Concepts

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of molecules in one mole of a substance.

Front

What is the main difference between prokaryotes and eukaryotes?

Back

Prokaryotes lack a nucleus and membrane-bound organelles, while eukaryotes have a nucleus and organelles.

Front

How many valence electrons does sulfur have?

Back

Sulfur has 6 valence electrons.

Front

What are purines and pyrimidines?

Back

Purines (adenine and guanine) are double-ring nitrogenous bases, while pyrimidines (cytosine, thymine, and uracil) are single-ring nitrogenous bases.

Front

Identify the nitrogenous base that is a pyrimidine.

Back

Thymine is a pyrimidine nitrogenous base.

Front

What is the function of ribosomes in cells?

Back

Ribosomes are responsible for protein synthesis in both prokaryotic and eukaryotic cells.

Front

What is the structure of DNA?

Back

DNA is a double helix composed of two strands of nucleotides, with complementary base pairing (A-T and C-G).

Front

What is the role of lysosomes in eukaryotic cells?

Back

Lysosomes contain enzymes that break down waste materials and cellular debris.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons determine how an atom can bond with other atoms to form molecules.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons between atoms.