What is an example of a covalent bond? A weak electroneutral force attracting tw
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Question
What is an example of a covalent bond?
A weak electroneutral force attracting two hydrogen atoms to each other forming the bond
One hydrogen atom transferring its electron to another atom
The nuclei of two hydrogen atoms fusing to form a single molecule
Two hydrogen atoms each having a single electron that it shares with the other
An atom bonds to another atom by sharing three pairs of electrons.
Which type of chemical bond holds these atoms together?
Ionic
Covalent
Hydrogen
Electroneutral
After a rainy day, a leaf has small droplets of water on its surface.
Which property of water is this an example of?
Cohesion
Density
Temperature stability
Good solvent
A pinch of salt is added to water and soon is no longer visible.
Which characteristic of water is this an example of?
Cohesion
Good solvent
Density
Temperature stability
A certain molecule will not dissolve in water and has a structure consisting of glycerol covalently bound to three fatty acid tails.
What is the function of this molecule?
Genetic information storage
Energy storage
Cell communication
Catalysis of chemical reactions
Molecules with hydrophilic heads and hydrophobic tails group together to form round structures with the tails facing inwards when placed in water.
What role does this molecule play in a cell?
Stores energy
Forms membranes
Catalyzes chemical reactions
Stores genetic information
21
The process of glycolysis yields a net of two ATP molecules that are produced by phosphorylation.
What is true regarding the transformation of energy in this system?
Energy is transformed into a form more useful for the cell.
Energy is destroyed.
Energy is transformed into a long-term storage form.
Energy is created.
22
Cells utilize the energy of ATP to do useful work, such as power muscle contractions. During cellular activities like muscle contractions, ATP is converted into ADP and a phosphate group.
What is happening to energy in this process of conversion?
Energy is being released.
Energy is being stored.
Energy is being destroyed.
Energy is being created.
23
Which molecule is an input to the light-dependent reaction of photosynthesis?
Sugar
Oxygen
Water
Carbon dioxide
Which molecule does a plant need from the environment in order to conduct photosynthesis?
Sugar
ATP
Carbon dioxide
Oxygen
What is a necessary input to begin the process of cellular respiration?
Water
Carbon dioxide
Sugar
ATP
Which stage of cellular respiration produces pyruvate?
Electron transport chain
Glycolysis
Krebs cycle
Calvin cycle
Chocolate is made through a process in which yeasts, bacteria, and molds, in the absence of oxygen, drive a complex chemical process that breaks down sugars in cacao beans to produce the chocolate flavor. Alcohols and acids are end products of this process, along with a small number of ATP molecules per glucose molecule.
According to this information, which metabolic process takes place to produce chocolate?
Cellular respiration
Aerobic respiration
Fermentation
Photosynthesis
A cell is bounded by a cell wall and contains an organelle that can carry out photosynthesis.
Which type of eukaryotic cell and organelle is described above?
Plant; chloroplast
Animal; ribosome
Both plant and animal; mitochondria
Animal; Golgi
What is true of a prokaryotic cell?
It is one of the smallest living cells, has a cell wall, and contains a nucleoid region.
It is found in plants, has chloroplasts, and its DNA is contained in the nucleus.
It contains a nucleus and membrane-bound organelles.
It contains a nucleus, but lacks a cell wall.
30
The cell membrane is a phospholipid bilayer with a hydrophobic interior.
Which component of a phospholipid is hydrophobic?
The protein core
The fatty acid tail
The phosphate group
The glycerol head
32
Chromosomes are structures that contain hereditary material that will be passed from one generation to the next.
According to this information, which organic molecule must be present in chromosomes?
RNA
DNA
Glucose
Lipid
33
A cell has just divided and is currently growing and metabolizing. Although this cell will continue through the cell cycle and divide again, it has not yet copied its DNA.
In which stage of the cell cycle is this cell?
Cytokinesis
Synthesis
G1
G2
Explanation / Answer
Ans 1 : Two hydrogen atoms each having a single electron that it shares with the other
The covalent bond is formed when the electrons are shared by the neighbouring atoms of the molecule , such that each one of them fulfills their duplet or octet.
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