Unit 1 test Review (1st block)

What are the two main stages of photosynthesis?

• Light-dependent reactions and Calvin cycle

• Glycolysis and Krebs cycle

• Nitrogen fixation and nitrification

• Fermentation and aerobic respiration

In which part of the cell does the Krebs cycle occur?

• Chloroplast

• Mitochondrial matrix

• Cytoplasm

• Mitochondrial intermembrane space

What is the primary role of carbon in the carbon cycle?

• It acts as a primary energy source for plants.

• It is used in the synthesis of proteins.

• It serves as a structural component of cellular membranes.

• It is a key component of all known life on Earth, cycling through the Earth's ecosystems.

Which of the following is NOT a type of macromolecule?

• Carbohydrates

• Lipids

• Proteins

• Salts

What is the first step of protein synthesis?

• Translation

• Transcription

• Replication

• Modification

What is the main function of enzymes in biological reactions?

• To provide structural support to cells

• To store genetic information

• To speed up chemical reactions

• To transport substances across cell membranes

Which molecule carries the genetic code from DNA to the ribosome for protein synthesis?

• tRNA

• mRNA

• rRNA

• DNA polymerase

During photosynthesis, what molecule provides the electrons needed for the light-dependent reactions?

• Carbon dioxide

• Oxygen

• Water

• Glucose

What is the end product of glycolysis?

• Pyruvate

• Glucose

• ATP

• NADH

Which process in the carbon cycle involves the conversion of carbon dioxide into organic compounds by plants?

• Respiration

• Decomposition

• Photosynthesis

• Combustion