Uzma Topics Chapter 2 mcq create with chatgpt4 from pdf

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What is the primary function of enzymes in biological reactions?

To provide energy for reactions

To speed up chemical reactions (correct)

To store genetic information

To form cell structures

What describes allosteric regulation of enzymes?

Removal of enzymes from the cell

Change in enzyme activity due to binding at a non-active site (correct)

Direct blocking of the active site of enzymes

Replication of enzyme molecules

What is the primary role of the phospholipid bilayer in cell membranes?

To synthesize proteins

To act as the genetic material

To provide structural support to the cell

To form a selective barrier around the cell (correct)

What is the primary function of integral membrane proteins?

To serve as channels or carriers for transport across the membrane Signup and view all the answers

Which mechanism describes active transport across cell membranes?

Movement of substances from an area of lower concentration to higher concentration using energy Signup and view all the answers

What role does cholesterol play in cell membranes?

It helps maintain fluidity and stability of the membrane. Signup and view all the answers

What is a coenzyme?

A non-protein compound that assists enzymes in their catalytic activity Signup and view all the answers

What role does feedback inhibition play in metabolic pathways?

It regulates enzyme activity to avoid overproduction of the end product Signup and view all the answers

Which model describes the cell membrane as a dynamic arrangement of phospholipids and proteins?

The fluid mosaic model Signup and view all the answers

Which type of membrane protein is embedded within the membrane and can span its entire width?

Integral proteins Signup and view all the answers

What is an example of passive transport across a cell membrane?

Facilitated diffusion through a protein channel Signup and view all the answers

What function does the fluid mosaic model attribute to cell membranes?

Creating a dynamic and selective barrier for the cell Signup and view all the answers

How do enzymes lower the activation energy of a chemical reaction?

By providing an alternative pathway with lower activation energy Signup and view all the answers

What is an example of covalent modification in enzyme regulation?

Attachment or removal of a phosphate group to/from an enzyme Signup and view all the answers

What is the significance of the 'fluid' aspect of the fluid mosaic model of cell membranes?

It suggests that membrane components can move laterally within the layer. Signup and view all the answers

To provide structural support to enzymes

To act as carriers of electrons in oxidation-reduction reactions Signup and view all the answers

How does feedback inhibition regulate the activity of enzymes like threonine deaminase?

By binding of the end product to the enzyme, inhibiting its activity Signup and view all the answers

What is the function of ion channels in cell membranes?

To allow the passage of inorganic ions across the membrane Signup and view all the answers

What distinguishes active transport from passive transport across cell membranes?

Active transport requires energy to move substances against their concentration gradient Signup and view all the answers

Which statement best describes the function of a coenzyme like FAD in cellular metabolism?

It acts as an electron carrier in redox reactions. Signup and view all the answers

Which enzyme regulation mechanism involves the addition or removal of phosphate groups?

Covalent modification Signup and view all the answers

What role do carrier proteins in cell membranes primarily play?

Facilitating the transport of specific molecules across the membrane Signup and view all the answers

Which of the following is a characteristic feature of coenzymes in enzymatic reactions?

They are reusable and work with multiple enzymes. Signup and view all the answers

What distinguishes primary active transport from secondary active transport in cells?

Primary active transport uses ATP directly, while secondary does not. Signup and view all the answers