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The primary role of _____ is to bind animal cells together. - ANSWER-
desmosomes
_____ aid in the coordination of the activities of adjacent animal cells. -
ANSWER-Gap (communicating) junctions
Which of these cell junctions form a barrier to the passage of materials? -
ANSWER-tight junctions
Plasmodesmata in plant cells are most similar in function to which of the following
structures in animal cells? - ANSWER-gap junctions
The _____ is composed of DNA and protein. - ANSWER-chromatin
Ribosomal subunits are manufactured by the _____. - ANSWER-nucleolus
_____ are the sites of protein synthesis. - ANSWER-Ribosomes
What is positive feedback? - ANSWER-An end product speeds up its own
production.
,What is negative feedback? - ANSWER-Accumulation of the end product slows its
production.
What is an example of positive feedback? - ANSWER-The increasing labor
contractions of childbirth before delivery.
Which of these is reflective of the hierarchical organization of life from most to
least inclusive? - ANSWER-kingdom, phylum, class, order, family, genus, species
A controlled experiment is one in where - ANSWER-there are at least two groups,
one of which does not receive the experimental treatment.
A substance that cannot be broken down into other substances by ordinary
chemical procedures is a(n) - ANSWER-element.
A substance that consists of two or more substances in a fixed ratio is a -
ANSWER-compound.
Which of the following subatomic particles always has a positive charge? -
ANSWER-proton
Which statement is true of all atoms that are anions? - ANSWER-The atom has
more electrons than protons.
Subatomic particles that have no electrical charge and are located in the atomic
nucleus are - ANSWER-neutrons
, Two atoms of an element that differ in number of neutrons are - ANSWER-
isotopes.
Isotopes of an element are similar in the sense that they have the same - ANSWER-
number of protons.
Isotopes of an element differ in the sense that they have a different - ANSWER-
number of neutrons.
A sharing of a pair of valence electrons by two atoms is referred to as a -
ANSWER-covalent bond.
Atoms that have an *equal* sharing of a pair of valence electrons is called a -
ANSWER-nonpolar covalent bond.
Atoms that have an *unequal* sharing of a pair of valence electrons is called a -
ANSWER-polar covalent bond.
Energy that matter possess due to location or its structure is known as - ANSWER-
potential energy.
When a cation and anion are attracted to each other, this is known as a(n) -
ANSWER-ionic bond.
The attraction between a hydrogen covalently bonded to one electronegative atom
and another electronegative atom is called a - ANSWER-hydrogen bond