Question 1

Which of the following best explains why carbon is favored over silicon for building large biological molecules?

Accepted Answer

Carbon forms strong and stable bonds, allowing for complex and diverse molecular structures.

Question 2

Which statement correctly describes the structure and function of lipids in biological membranes?

Accepted Answer

Lipids have hydrophobic tails and hydrophilic heads, forming bilayers that act as barriers.

Question 3

During transcription, which enzyme catalyzes the synthesis of RNA from a DNA template?

Accepted Answer

RNA polymerase

Question 4

Which of the following is a correct description of the sugar component in ribonucleotides compared to deoxyribonucleotides?

Accepted Answer

Ribonucleotides have an additional $$-OH$$ group on the 2' carbon.

Question 5

Which base is found in ribonucleotides but not in deoxyribonucleotides?

Accepted Answer

Uracil

Question 6

What type of bond holds the two strands of DNA together?

Accepted Answer

Hydrogen bonds

Question 7

Which organelle is primarily responsible for ATP production through cellular respiration?

Accepted Answer

Mitochondria

Question 8

A patient has a genetic disorder affecting the rough endoplasmic reticulum. Which cellular process is most likely impaired?

Accepted Answer

Protein folding and synthesis

Question 9

Which of the following is NOT a function of the Golgi apparatus?

Accepted Answer

Synthesizing ribonucleotides

Question 10

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA is replicated, transcribed into RNA, and RNA is translated into protein.

Question 11

Which of the following trace elements is essential for the structure of nucleic acids and energy transfer in cells?

Accepted Answer

Phosphorus

Question 12

Which cellular structure is responsible for translating mRNA into proteins?

Accepted Answer

Ribosome

Question 13

Which of the following statements about carbohydrates is correct?

Accepted Answer

Carbohydrates serve as fuel and are involved in cell recognition.

Question 14

In animals, glucose is stored primarily as which highly branched polymer?

Accepted Answer

Glycogen

Question 15

Which process involves the breakdown of macromolecules within the cell?

Accepted Answer

Lysosomal degradation

Question 16

Which of the following best describes the orientation of lipids in a biological membrane?

Accepted Answer

Hydrophobic tails face inward, hydrophilic heads face outward.

Question 17

Which cellular structure stores water, ions, and nutrients in plant cells?

Accepted Answer

Plant vacuole

Question 18

Which of the following is a major function of chaperone proteins in the rough ER?

Accepted Answer

Assisting in protein folding

Question 19

A mutation prevents the formation of phosphodiester linkages in nucleic acids. Which process would be directly affected?

Accepted Answer

DNA and RNA polymerization

Question 20

Which of the following best describes the role of secretory granules in cells?

Accepted Answer

They store and release cellular products via exocytosis.

Introduction to Biochemistry: Atoms, Biomolecules, and Cellular Structures

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