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Various mammals _______.
A gamete affected by nondisjunction would have .
a. change from the normal chromosome number
b. one extra or one missing chromosome
c. the potential for a genetic disorder
the fetal cells floating in the amniotic fluid.
the chance of the defect occurring in the unborn children increases.
it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria.
found in proteins but not nucleic acids.
Which is not a nucleotide base in DNA?
James Watson and Francis Crick
What are the base-pairing rules for DNA?
In the pairing of two nucleotides within the double helix
From X-ray diffraction data, which of the following was determined about DNA?
guanine is paired with cytosine.
alternating sugar and phosphate molecules.
the two DNA strands unwind from each other.
DNA replication requires
two molecules, each of which is half-new and half-old DNA joined lengthwise to each other.
Cell differentiation .
The expression of a given gene depends on the .
Regulatory proteins interact with .
c. gene products
lactose-metabolizing enzymes need not be made when lactose is not present.
activated by a protein known as CAP.
Eukaryotic genes guide .
Which of the following is the region that is binding site for RNA polymerase?
the distribution of sweat glands.
Hormones may gene transcription in target cells
programmed cell death by suicide
is useful in determining the extent to which a sexually reproducing population is evolving.
specific sequences of nucleotides and sticky ends.
a. often produce staggered cuts in DNA that are useful in splicing genes. b. Are like most enzymes in being very specific in their action c. Are natural defense mechanisms evolved in bacteria to guard against or counteract bacteriophages d. Are used along with ligase and plasmids to produce a DNA library
Because it has no introns, researchers prefer to use ____ when working with human genes.
DNA fragments result when ________ cut DNA molecules at specific sites.
By reverse transcription, _____ is assembled on ______
polymerase chain reaction
Automated DNA sequencing relies on .
differences of locations where enzymes make their cuts.
a gene library.
is the transfer of normal genes into body cells to correct a genetic defect.
energy can be neither created nor destroyed.
In simple diffusion
Hydrolysis is a (an) ______ reaction.
matching of enzyme with substrate.
a. are very specific b. act as catalysts c. are organic molecules d. have special shapes that control their activities
binding regulatory molecules at another site.
Proximal convoluted tubule
can readily diffuse across a lipid bilayer
The sodium-potassium pump
move into the cell.
the production of pyruvate and occurs in the cytoplasm.
Glycolysis starts and ends in the
Which of the following does not form during glycolysis?
electron transport phosphorylation.
The correct operational sequence of the three process listed below is:I. glycolysis II. ETP III. Krebs
electron transport phosphorylation
Electron transport systems involve
In the last stage of aerobic respiration, _______ is the final acceptor of electrons that originally resided in glucose.
engage in lactate fermentation.
In alcoholic fermentation, ______ is the final acceptor of the electrons stripped from glucose.
In certain organisms and under certain conditions, can be used as an energy alternative to glucose.
the energy released in respiration is channeled into molecules of ATP.
The human axial skeleton includes all of the following EXCEPT
Which of the following is NOT part of the appendicular skeleton?
Involuntary and nonstriated
Which of the following includes all the others?
actin and myosin filaments change positions relative to each other.
After a myosin head has performed a power stroke, it must first bind to _____ in order to perform another power stroke.
aortic valve to open.
At the beginning of systole
Mast cells and ______ release histamine
As a person inhales, the alveolar pressure _______, the pressure in the pleural cavities __________ , and the atmospheric pressure ______
Nasal passage, pharynx, larynx, trachea, bronchus, bronciole, alveolus
The pressure in the pleural cavities is always lower than atmospheric pressure. (T or F)
the dorsal roots.
The resting potential of a neuron is due mostly to
At equilibrium, when the neuron is at rest,
the concentration of K+ ions is higher inside the cell, but the diffusion force driving K+ ions out of the cell is balanced by an electrical force keeping K+ from leaving the cell.
sodium channels are inactivated, while gated potassium channels open.
the opening of voltage-gated sodium channels.
, is the enzyme responsible for breaking down acetylcholine into and .
haploid plants that produce gametes.
The ______, which bears flowers, roots, stems, and leaves, dominates the life cycle of flowering plants.
the possession of vascular tissue and dominance by the diploid generation.
All are Bryophytes EXCEPT
spores give rise to ggametophytes.
Rhizomes in the whisk ferns serve the same function as _____ in more advanced land plants.
Whisk ferns, lycophytes, horsetails, and ferns are classified as ______ plants.
Which of the following statements is NOT true?
Which DOES NOT apply to gymnosperms and angiosperms?
Carbon, hydrogen, oxygen, nitrogen, and potassium are examples of
Soft, moist plant parts consist mostly of ______ cells.
Roots and shoots lengthen through activity at ________
Perpetually young tissues where cells retain the ability to divide are
Xylem and phloem are tissues.
Which theory of water transport states that hydrogen bonding allows water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?
the cohesion-tension theory
The cells that function with the sieve tubes are the
_____ conducts water and ions; ______ conducts food.
In daytime, most plants lose _____ and take up _________
At night, most plants conserve ______ , and ______ accumulates.
The main photosynthetic area of a leaf is composed of .
The openings in elaves that function to exchange gases are called .
Buds give rise to .
Mesophyll consists of
The internal membrane system of the chloroplast is called a
Thylakoid disks are
Stroma and grana are portions of
The carbon source for organisms that derive their energy from photosynthesis is
Most carbon enters the web of life through
The oxygen released in photosynthesis comes from
Plants need which of the following to carry on photosynthesis?
Four of the five answers listed below are heterotrophs. Select the exception
How many membranes surround a chloroplast from a plant cell?
Where in a plant cell is chlorophyll found?
Which of the following are the pigments characteristic of red algae and cynobacteria?
absorbs the energy and moves an electron to a higher energy state.
splitting two molecules of water.
An important electron and hydrogen acceptor in noncyclic pathways of ATP formation is
light-dependent reactions begin.
ATP and NADPH form.
ribulose biphosphate (RuBP).
carbon dioxide is attached to RUBP
ATP phosphorylates ________ in the light-independent reactions.
The light-independent reactions proceed in the
The Casparian strip is associated with the
A _________ strip in endodermal cell walls forces water and solutes to move through root cells, not around them.
Mitosis takes place in which region of the root?
The nutrition of some plants depends on a root-bacterium association known as a
Older roots and stem thicken through activity at .
The evolution of flowers and insects is an example of
The male part of the flower is the
Which of the following are produced within the anthers?
The endosperm is
The zygote is
After meiosis within pollens sacs, haploid _______ form.
After meiosis in ovules, _______ megaspores form
A seed leaf is a
Cotyledons develop as part of all flowering plant
The signaling chemicals produced by one group of cells that affect distant target cells are called
The plant hormone that promotes fruit ripening is
Absicisic acid promotes water loss and dormancy. (T or F)
Plant hormones .
Light of _______ is the strongest stimulus for phototropism.
Rhythms that are repeated every 24 hours are collectively and specifically known as
The flowering process is a ________ response.
All the processes that lead to the death of a plant or any of its organs are called
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