Bio Semester 1 Exam 2024

Front

Which type of cell appeared first on earth?

Back

Prokaryotic cells are the first type of cells that appeared on Earth, characterized by their lack of a nucleus and membrane-bound organelles.

Front

What does DNA stand for?

Back

DNA stands for Deoxyribonucleic acid, which is the molecule that carries genetic information in living organisms.

Front

True or False: Polymers are molecules made from repeating units of identical organic compounds that are linked together with hydrogen bonds.

Back

False. Polymers are made from repeating units called monomers, which are linked together by covalent bonds, not hydrogen bonds.

Front

True or False: Without enzymes, chemical reactions necessary for life would not occur at a rate sufficient to sustain life.

Back

True. Enzymes are biological catalysts that speed up chemical reactions, making them essential for sustaining life.

Front

What chemical bond in ATP releases energy when broken?

Back

The phosphate bond in ATP releases energy when broken, which is crucial for powering cellular processes.

Front

Define prokaryotic cells.

Back

Prokaryotic cells are simple, unicellular organisms that lack a nucleus and membrane-bound organelles, such as bacteria.

Front

What is the function of enzymes in biological reactions?

Back

Enzymes act as catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur.

Front

What are the building blocks of proteins?

Back

The building blocks of proteins are amino acids, which link together to form polypeptides and proteins.

Front

Define polymers and give an example.

Back

Polymers are large molecules made up of repeating subunits called monomers. An example is polyethylene, a common plastic.

Front

What is the role of ATP in cells?

Back

ATP (adenosine triphosphate) serves as the primary energy carrier in cells, providing energy for various cellular processes.