Biol 1201 Exam 1 (gregg) Questions With
Verified Answers
plasma membrane
The membrane at the boundary of every cell that acts as a selective barrier, thereby regulating the
cell's chemical composition.
Ribosomes
complexes that make proteins; free in cytosol or bound to rough ER or nuclear envelope
Golgi apparatus
active in synthesis, modification, sorting, and secretion of cell products
Lysosome
digestive organelle where macromolecules are hydrolyzed, and autophagy
Mitachondrion
organelle where cellular respiration occurs and most ATP is generated
Cytoskeleton
reinforces cell's shape; functions in cell movement; components are made of protein. Includes:
Microfilaments, Intermediate filaments, Microtubules.
Endoplasmic Reticulum
network of membranous sacs and tubes; active in membrane synthesis and other synthetic and
metabolic processes; has rough (ribosome-studded) and smooth regions
Rough ER
protein synthesis
Smooth ER
lipid synthesis
calcium ion storage
poison detoxification
Nucleolus
nonmembranous structure involved in production of ribosomes; a nucleus has one or more nucleoli
Chromatin
material consisting of DNA and proteins; visible in a dividing cell as individual condensed
chromosomes
cell wall
outer layer that maintains cell's shape and protects cell from mechanical damage; made of cellulose,
other polysaccharides, and protein
, Chloroplast
photosynthetic organelle; converts energy of sunlight to chemical energy stored in sugar molecules
central vacuole
prominent organelle in older plant cells; storage, breakdown of waste products, hydrolysis of
macromolecules; enlargement of vacuole major mechanism of plant growth.
Part complete
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
What type of bond is joining the two hydrogen atoms?
covalent
A(n) _____ refers to two or more atoms held together by covalent bonds.
molecule
This atom can form up to _____ single covalent bond(s)
4
A(n) _____ bond joins these two oxygen atoms.
double covalent
Part complete
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
6
.Part complete
Which of these refers to atoms with the same atomic number but different atomic masses?
these atoms are isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?
10
.An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
protons does boron have?
5
Verified Answers
plasma membrane
The membrane at the boundary of every cell that acts as a selective barrier, thereby regulating the
cell's chemical composition.
Ribosomes
complexes that make proteins; free in cytosol or bound to rough ER or nuclear envelope
Golgi apparatus
active in synthesis, modification, sorting, and secretion of cell products
Lysosome
digestive organelle where macromolecules are hydrolyzed, and autophagy
Mitachondrion
organelle where cellular respiration occurs and most ATP is generated
Cytoskeleton
reinforces cell's shape; functions in cell movement; components are made of protein. Includes:
Microfilaments, Intermediate filaments, Microtubules.
Endoplasmic Reticulum
network of membranous sacs and tubes; active in membrane synthesis and other synthetic and
metabolic processes; has rough (ribosome-studded) and smooth regions
Rough ER
protein synthesis
Smooth ER
lipid synthesis
calcium ion storage
poison detoxification
Nucleolus
nonmembranous structure involved in production of ribosomes; a nucleus has one or more nucleoli
Chromatin
material consisting of DNA and proteins; visible in a dividing cell as individual condensed
chromosomes
cell wall
outer layer that maintains cell's shape and protects cell from mechanical damage; made of cellulose,
other polysaccharides, and protein
, Chloroplast
photosynthetic organelle; converts energy of sunlight to chemical energy stored in sugar molecules
central vacuole
prominent organelle in older plant cells; storage, breakdown of waste products, hydrolysis of
macromolecules; enlargement of vacuole major mechanism of plant growth.
Part complete
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
What type of bond is joining the two hydrogen atoms?
covalent
A(n) _____ refers to two or more atoms held together by covalent bonds.
molecule
This atom can form up to _____ single covalent bond(s)
4
A(n) _____ bond joins these two oxygen atoms.
double covalent
Part complete
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
6
.Part complete
Which of these refers to atoms with the same atomic number but different atomic masses?
these atoms are isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?
10
.An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
protons does boron have?
5
