Biology Lecture Quiz: 2, 3, 4, 5.4
A nuetral atom has an atomic number of 18 and a mass number of 32? How many electrons does it have?
18
A nuetral atom has an atomic number of 18 and a mass number of 32? How many protons does it have?
18
In addition to carbon, an organic molecule must contain
hydrogen
The weak attractions between water molecules (the dotted lines) are known as
hydrogen bonds
During an osmosis experiment in class, you look at some cells under the microscope. You notice the cells look shriveled. What type of solution were the cells immersed in?
hypertonic
Which of the following is a hydrolysis reaction?
glycogen forming glucose molecules
The pH of pure water is [BLANK] because [BLANK].
7.0; water contains an equal number of H+ ions and OH- ions.
A neutral atom has an atomic number of 18 and a mass number 32. How many electrons are in the valence shell of this atom?
8
Which of the following charateristics of water, gives a water molecule the ablilty to cling to another polar surface?
Adhesion
Which of the following statements about basic solutions is true?
Basic solutions release OH-.
Which of the following is a steroid that provides stability with the plasma membrane of an animal cell?
Cholesterol
Sulfur has an atomic number of 16. How many valence shell electrons does it have?
Six
What is the term of the loss of the 3D shape of a protein & thereby elminating its function?
Denaturation
What is the term for what might happen to an plant cell in a isotonic environment?
Flaccid
Which organelle is responsible for the synthesis of lipids and detoxification of toxic substance?
Smooth Endoplasmic Reticulum
What is the term for what might happen to an animal cell in a hypotonic environment?
Lysis
Which of the following is responsible for the synthesis of ribosomes?
Nucleolus (nucleoli)
Which of the following contains DNA and proteins?
Nucleus
Which of the following describes the process by which cells use pseudopods to bring in large food particals & is often called "cell eating"
Phagocytosis.
The linear sequence of amino acids in a polypeptide chain is referred to as its [BLANK] structure.
Primary
Which of the following describes saturated fats?
They contain only signal bonds between atoms in their carbon skeleton.
if a cell is placed in a hypotonic solution, which will occur?
Water will move into the cell from the surrounding solution.
The four main catagories of organic macromolecules are
carbonhydrates, lipids, proteins, and nucleic acids.
The main structural component of a plant cell wall is...
cellulose.
A molecule that regulates the fluidity of animal cell membrane by stiffening the membrane at higher tempeture and preventing the membrane from freezing at lower temperature is
cholesterol
All cells have some charateristics in common ; both ptokaryotic and eukaryotic cells have
cytoplasm, a plasma membrane, ribosomes and DNA.
A prokaryotic cell
does not have a membrane-bound nucleus.
The gycolproteins found in the plasma membrane fuction in what capacity.
establishing to identitiy of the cell
The cell wall of bacteria cells and plant cell functions in
maintaining cell shape.
Which one of the following is an function of proteins
metabolism
Cyanide binds and impairs one of the molecules involved in the synthesis of ATP. The target organelle for cyanide must be...
mitochondria.
Both plants and animals need mitochondria to
produce ATP.
Amino Acids are needed to build [BLANK], just as [BLANK] are needed to create DNA.
proteins; nucleotides
Which of the following methods of transport using a coated pit with proteins receotirs to take in a specific type of molecule, such as cholesterol?
receptor-mediated endocytosis
After drinkning a great deal of coffee (pH 5), a human blood buffering system would need to [BLANK] as the coffee was digested to lower the level of acid present in the blood stream
take up H+
Plasma membrane are selectively permeable. This means that
the plasma membrane allows some substances to enter or leve a cell more easy than others.
What prevents a plant cell from bursting in a hypotonic solution?
the presents of a cell wall
As discussed in the Connections for this Chapter, what are omega-3 fatty acids.
unsaturated fats that promote brain and cardiovascular health
The reactivity of an atom depends on the number of...
valence electrons.
In which way are vesticals different from vacuoles?
vesticles are smaller than vacuoles
