Uzma Chapter 1 mcq created with chatgpt4. from page 32 -73

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What was the critical characteristic of the macromolecule from which life evolved?

Ability to produce energy

Ability to replicate itself (correct)

Ability to form complex structures

Ability to mutate rapidly

What role did RNA play in the early stages of life?

It served as the main structural component of cells.

It replaced DNA as the genetic material.

It was involved in the start of life, potentially leading to the genetic code. (correct)

It was primarily a source of energy.

What is the role of phospholipid membranes in cells?

They primarily provide energy for cellular activities.

They act as the genetic material of the cell.

They create a stable barrier and environment for cellular processes. (correct)

They are the main site of protein synthesis.

Which molecule is primarily responsible for storing and transmitting genetic information?

DNA (D) Signup and view all the answers

What is the primary function of ribosomes in the cell?

Protein synthesis (B) Signup and view all the answers

In the context of cell biology, what is a 'gene'?

A segment of DNA that encodes a functional product, typically a protein (B) Signup and view all the answers

Which process best describes the function of messenger RNA (mRNA) in cells

It carries genetic information from DNA to the ribosome. (D) Signup and view all the answers

What is the primary role of enzymes in biological reactions?

To speed up chemical reactions. (B) Signup and view all the answers

In the context of cell biology, what is osmosis primarily concerned with

The flow of water molecules across a semipermeable membrane. (B) Signup and view all the answers

What is a key feature of a prokaryotic cell?

It lacks membrane-bound organelles. (B) Signup and view all the answers

In cell biology, what is the primary function of mitochondria?

Energy production (C) Signup and view all the answers

Which type of cell junction forms a barrier to prevent leakage of extracellular fluid across a layer of epithelial cells?

Tight junctions (C) Signup and view all the answers

How did RNA contribute to the early stages of life, according to the RNA World hypothesis?

By functioning as the first genetic material (A) Signup and view all the answers

What is the role of phospholipid membranes in the formation of the first cells?

(C) Signup and view all the answers

In the context of early cellular life, what was the significance of protein synthesis?

It allowed for the development of more complex cellular functions (C) Signup and view all the answers

What was the primary role of RNA in the early stages of life according to the RNA World hypothesis?

It functioned as the first genetic material and catalyzed chemical reactions. (C) Signup and view all the answers

What role did phospholipid membranes play in the formation of the first cells?

They created a stable barrier for evolving cellular structures. (C) Signup and view all the answers

What is the significance of protein synthesis in early cellular life?

It allowed for the development of more complex cellular functions. (C) Signup and view all the answers

What is the role of RNA in protein synthesis?

RNA carries the genetic code needed for constructing proteins. (C) Signup and view all the answers

What was the likely structure of the first cell?

A self-replicating RNA enclosed in a protective membrane. (A) Signup and view all the answers

What is the primary function of a phospholipid membrane in cells?

To create a stable barrier and environment for cellular processes. (C) Signup and view all the answers