KAHOOT EXAM 1- the working cell

Question 1

which type of chemical bonding involves the sharing of electrons between atoms?
a) Covalent
b) Ionic
c)Hydrogen
d) Hydrophobic interactions

Answer 1

a) Covalent

Question 2

which element is the backbone of organic molecules?
a) Nitrogen
b) Oxygen
c) Carbon
d) Hydrogen

Answer 2

c) Carbon

Question 3

which specialized cell-cell junction is responsible for cytoplasmic connections between adjacent plant cells?
a) Desmosomes
b) Gap junctions
c) Tight junctions
d) Plasmodesmata

Answer 3

d) Plasmodesmata

Question 4

which type of transport involves the movement of molecules or ions across the cell membrane through protein channels?
a) Simple diffusion
b) Facilitated diffusion
c) Active transport
d) Endocytosis

Answer 4

b) Facilitated diffusion

Question 5

what best describes pynocitosis?
a) The engulfing of large particles or whole cells by the cell membrane
b) The selective uptake of specific molecules by binding to receptor proteins
c) The bulk uptake of extracellular fluid and dissolved solutes by membrane invagination
d) The release of substances from a cell using vesicles

Answer 5

c) The bulk uptake of extracellular fluid and solutes by membrane invagination

Question 6

which of the following is a polymer of glucose molecules?
a) Starch
b) Sucrose
c) Fructose
d) Galactose

Answer 6

a) Starch

Question 7

which lipid molecule is a component of cell membranes?
a) Triglycerides
b) Phospholipids
c) Steroids
d) Waxes

Answer 7

b) Phospholipids

Question 8

Which of the following is NOT function of
proteins in nature?
a) Enzymatic catalysis
b) Cell structure
c) Energy storage
d) Transport

Answer 8

c) Energy storage

Question 9

in DNA, which nucleotide pairs with adenosine?
a) Thymine
b) Uracil
c) Guanine
d) Cytosine

Answer 9

a) Thymine

Question 10

which type of transport requires energy imput?
a) Passive transport
b) Facilitated diffusion
c) Active transport
d) Osmosis

Answer 10

c) Active transport

Question 11

which of the following is a polysaccharides used for energy storage in animals?
a) Cellulose
b) Starch
c) Glycogen
d) Chitin

Answer 11

Glycogen

Question 12

which membrane component is responsible for maintaining membrane fluidity under different temperature conditions?
a) Phospholipids
b) Cholesterol
c) Integral proteins (through membrane)
d) Peripheral proteins (on membrane)

Answer 12

b) Cholesterol

Question 13

what is the function of desmosomes?
a) Preventing the passage of substances between cells
b) Anchoring cells together
c) Facilitating communication between cells
d) Allowing the rapid diffusion of molecules

Answer 13

b) Anchoring cells together

Question 14

What is the primary driving force for passive transport processes?
a) ATP hydrolysis
b) Concentration gradient
c) Carrier proteins
d) Ion channels

Answer 14

b) Concentration gradient

Question 15

what is the function of receptor-mediated endocytosis in cells?

a) Importing large molecules into the cell
b) Exporting waste out of the cell
c) Communicating with neighboring cells
d) Receiving specific molecules from the extracellular environment

Answer 15

d) Receiving specific molecules from the extracellular environment

Question 16

what could occur if gap junctions malfunction in cardiac muscle cells?

a) Increased cellular communication
b) Decreased electrical coupling
c) Strengthened cell adhesion
d) Enhanced nutrient absorption

Answer 16

b) Decreased electrical coupling

Question 17

What structural feature distinguishes phospholipids from triglycerides?

a) Presence of glycerol
b) Presence of fatty acids
c) Presence of phosphate group
d) Presence of cholesterol

Answer 17

c) Presence of phosphate group

Question 18

What type of bond forms between amino acids during protein synthesis?

a) Peptide
b) Glycosidic
c) Ester
d) Hydrogen

Answer 18

a) Peptide

Question 19

How does systemic signaling work in plants?

a) Through direct cell-cell contact
b) Through the release of hormones into the bloodstream
c) Through the transport of signaling molecules through vascular tissues
d) Through electrical impulses

Answer 19

c) Through the transport of signaling molecules through vascular tissues

Question 20

Which level of protein structure involves the folding of the polypeptide chain into an alpha-helix or beta-sheet?

a) Primary
b) Secondary
c) Tertiary
d) Quaternary

Answer 20

b) Secondary

Question 21

Which of the following is NOT a function of proteins?

a) Structural support
b) Storage of genetic information
c) Enzymatic catalysis
d) Cell signaling

Answer 21

b) Storage of genetic information

Question 22

What type of protein structure involves the spatial arrangement of multiple polypeptide chains?

a) Primary
b) Secondary
c) Tertiary
d) Quaternary

Answer 22

d) Quaternary

Question 23

What is the typical ratio of carbon, hydrogen, and oxygen atoms in carbohydrates?

a) 1:2:1
b) 2:1:1
c) 3:2:1
d) 1:2:2

Answer 23

a) 1:2:1

Question 24

What is the primary role of albumin in eggs?

a) Facilitating gas exchange between the embryo and the environment
b) Providing structural support to the eggshell
c) Serving as a reservoir of amino acids for the growing embryo to utilize
d) Regulating osmotic pressure within the egg

Answer 24

c) Serving as a reservoir of amino acids for the growing embryo to utilize

Question 25

What is the primary role of secondary messenger signalling molecules?

a) Directly activating gene transcription in the nucleus
b) Initiating signal transduction cascades within the cytoplasm
c) Binding to cell surface receptors to initiate a cellular response
d) Transporting signaling molecules across the cell membrane

Answer 25

b) Initiating signal transduction cascades within the cytoplasm