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bio homeworks

homework

QuestionAnswer
Which of the following is a correct match of cell type with structure? muscle cell ... has proteins that slide back and forth
DNA is composed of building blocks called nucleotides
In eukaryotic cells DNA has the appearance of a double helix
What is the correct order for the hierarchy of biological organization from the least to the most complex? molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem
Protists and bacteria are grouped into different domains because rotists have a membrane-bounded nucleus, which bacterial cells lack.
taxonomic domain includes multicellular photosynthetic organisms? Eukarya
The universal genetic language of DNA is common to virtually all organisms on Earth, however diverse. What is the best explanation for this fact? All living things share a common genetic language of DNA because they share a common ancestry.
Which of the following is not an observation or inference on which Darwin's theory of natural selection is based? Poorly adapted individuals never produce offspring.
Each water molecule is joined to _____ other water molecules by ____ bonds. four ... hydrogen
The unequal sharing of electrons within a water molecule makes the water molecule polar
The tendency of an atom to pull electrons toward itself is referred to as its _____. electronegativity
In this molecule, what type of bond is found between the oxygen and hydrogens? polar covalent
Why isn't this insect drowning? Surface tension.
Because organisms are made primarily of water, they resist rapid temperature changes. This useful quality is based on water's _____. high specific heat
Which property of water allows a water strider to walk on water? water’s high surface tension
Which property of water allows dogs to cool themselves by panting? water’s high heat of vaporization
Why does ice float in liquid water? Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.
Which of these is the correct equation for the dissociation of water? H2O + H2O <==> H3O+ + OH-
What is the charge on a hydronium ion? 1+
What is the charge on a hydroxide ion? 1-
In a neutral solution the concentration of __ hydrogen ions is equal to the concentration of hydroxide ions
What conditions must be met in order for an aqueous solution to be called “neutral”? The concentrations of hydronium and hydroxide ions are equal.
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration? Raise it to 100 times its present value.
pH buffers They consist of weak acids and weak bases
A buffer consists of undissociated acid (HA) and the ion made by dissociating the acid (A-). How does this system buffer a solution against decreases in pH? A- reacts with H+ to become HA.
An acid is a substance that increases the hydrogen ion concentration of an aqueous solution
A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) _____. element
Changing the number of _____ would change an atom into an atom of a different element. protons in an atom
The innermost electron shell of an atom can hold up to _____ electrons 2
Which of these relationships is true of an uncharged atom? The number of protons is equal to the number of electrons
What determines the types of chemical reactions that an atom participates in? the number of electrons in the outermost electron shell
Atoms with the same number of protons but with different electrical charges _____ are different ions
An ionic bond involves ____ an attraction between ions of opposite charge
A(n) _____ refers to two or more atoms held together by covalent bonds. community molecule
What happens when two atoms form a chemical bond? A chemical bond forms when two atoms transfer or share outer electrons to complete their outer shells
atoms with the same atomic number but different atomic masses hese atoms are isotopes.
Created by: gtaine
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