What statement must be mentioned in explaining why amphipathic molecules line up at water surface
ANSWER>>>>polar groups attract one another
Dissolving is best describes as ANSWER>>>>a mingling of molecules and/or ions
Water is a source of ______________ for chemical rea...
Cell Biology Final Exam-Mastering Questions
What statement must be mentioned in explaining why amphipathic molecules line up at water surface
ANSWER>>>>polar groups attract one another
Dissolving is best describes as ANSWER>>>>a mingling of molecules and/or ions
Water is a source of ______________ for chemical reactions in cells.
a. hydrogen atoms
b. oxygen atoms
c. energy
d. both a and b
e. a,b, and c ANSWER>>>>both a and b// hydrogen atoms and oxygen atoms
Which statement is ture of waters tensile strength?
(a) It results from hydrogen bonding.
(b) It helps to pull water through plants.
(c) It involves both cohesion and adhesion.
Both (a) and (b).
(a), (b), and (c). ANSWER>>>>(a), (b), and (c).
Water has surface tension because ANSWER>>>>hydrogen bonds between surface water
molecules resist being stretched
Which of the following helps most to explain why water has a high specific heat? ANSWER>>>>A
water molecule can make 4 hydrogen bonds
Which factor is important in making it possible to cool yourself by sweating?
(a) Molecules collide with varied angles and speeds.
(b) Hydrogen bonds are relatively weak.
,(c) Water has more energy at the body surface.
Both (a) and (b).
(a), (b), and (c). ANSWER>>>>(a), (b), and (c).
Though you add heat the temperature of boiling water remains constant because ANSWER>>>>it
takes energy to break hydrogen bonds
which statement helps to explain why ice is less dense than liquid water?
(a) Water molecules make hydrogen bonds at definite angles.
(b) Cold molecules move less than warm molecules.
(c) Hydrogen bonds lengthen in the cold.
All of the above.
Both (a) and (b). ANSWER>>>>Both (a) and (b).
The open spaces in waters crystals structure make it possible for ANSWER>>>>aquatic life to
exsist at the north pole
Why doesn't oil mix with water? ANSWER>>>>polar moleucles attract one another
Robert Hooke coined the term cell when studying thin slices of cork. These __________ were the first
cells observed because ________________. ANSWER>>>>Dead plant cells; thick cell walls
did not require high resolution or magnification to view
Which technique discussed in the text would allow a cell biologist to determine the size and composition
of an individual protein? ANSWER>>>>Mass Spec
brightfield microscopy (stained) ANSWER>>>>where light passes directly through the
specimen
fluorescence microscopy ANSWER>>>>shows specific molecules
, Phase-contrast microscopy ANSWER>>>>amplifies variations in density
Confocal microscopy ANSWER>>>>uses a laser to view a single plane of a specimen
transmission electron microscopy (TEM) ANSWER>>>>Detects electrons passing through a
specimen
Scanning electron microscopy ANSWER>>>>detects electrons DEFLECTED from the surface
of the specimen
Which of the following is true of a nanometer? ANSWER>>>>A nanometer is equivalent to 10
Angstroms (Å).
You are working on a project that involves the direcet observation of DNA molecules. The microscope
that would give you the best information at this time would be the ANSWER>>>>Transmission
electron microscope (TEM)
Which of the following types of light microscopy improves the resolution of thick specimens by
illuminating one plane of the specimen at a time? ANSWER>>>>Confocal microscopy
Which of the following functional groups and compounds is polar, contains one or more electronegative
atoms in a bond, and can be reversibly ionized within the physiological pH range? ANSWER>>>>Amine
Defend the assertion that all of life as we know it depends critically on the fact that the angle between
the two hydrogen atoms in the water molecule is 104.5∘∘ and not 180∘ ANSWER>>>>It is the
asymmetry that renders water as a polar molecule. Most of the desirable
properties of water as a solvent depend on this polarity.
Hydrogen bonds are ANSWER>>>>noncovalent attraction among water molecules
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