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WorksheetsBio Exam 1
Total questions: 26
Worksheet time: 20mins
The three dimensional structure of protein
will be different in different organisms, even when the amino acid sequence is the same.
is not related to its function.
cannot be altered once folded by chaperone proteins.
is determined by the sequence of amino acids in the polypeptide chain.
always contains multiple polypeptide chains.
Starch and glycogen which are both polysaccharides, differ in that starch ____, while glycogen ____.
Is a temporary compound used to store glucose; is a highly stable compound that stores complex lipids
Is the main energy storage in animal; is a temporary compound used to store glucose
Is the main component for plant structural support; is an energy source for animals
Is the principal energy storage compound of plant; is the main energy storage in animals
Is a structural material found in plant and animal; forms external skeletons in animals
Biologist listens to frog singing at a local pawn and hypothesizes that the sounds are mating calls. What would be the next step in the hypothesis and prediction method?
Controlling an environment
Forming a hypothesis
Making a prediction
Testing a prediction
Making an observation
The advantage of controlled scientific experiments is that
A massive amount of data can be synthesized.
The hypothesis can be proven correct.
Investigations can be carried out in the field.
All variables except one are held constant.
Patterns can be predicted.
A group of cells that work together to carry out a similar function is known as a(n)
tissue.
unicellular organism.
organ system.
gene.
protein.
Which statement about protein structure is true?
Both secondary and tertiary structure derive from primary structure
There is no relationship between the primary structure of a protein and its tertiary structure.
The primary structure of the same protein varies somewhat, but always results in the same tertiary structure.
Tertiary structure governs secondary structure, which in return governs primary structure.
The end product of transcription is ____, and the end product of translation is ____.
RNA; DNA
proteins; RNA
DNA; RNA
proteins; DNA
RNA; proteins
The ability of an atom to combine with other atoms is determined by the atoms
Ability to form isomers.
Number and distribution of electrons.
Mass number.
Nuclear configuration.
Atomic weight.
Which of the following is not an example of secondary structure in a protein?
alpha Helix
parallel beta pleated sheet
gamma sheet
all the above are example of secondary structure
Which event was most directly Responsible for increasing oxygen in Earth's atmosphere
The rise of prokaryotes
The evolution of photosynthesis
The emergence of eukaryotes
The cooling of the planet
The development of multicellularity
A molecule with the formula C6 H12 O6 can be classified as a
lipid
fat
protein
nucleic acid
carbohydrate
an atom is most stable when
Is outermost electrons shell follows the quartet room
You can have one unpaired valence electron, allowing it to follow the octet rule
It has eight electrons
It can share electrons with other atoms to form an uneven number of pairs of electrons
it can fill its outermost shell by sharing electrons or by gaining or losing one or more electrons until it is filled
a covalant bond is formed by the sharing ___ of between atoms, whereas an ionic bond is formed by the ___.
protons; electric attraction between two neutral atoms
neutrons; sharing of electrons
electrons; electric attraction between two neutral atoms
electrons; transfer of electrons from one atom to another
protons; sharing of electrons
The nucleus of a cell is G2 has 0.8 pg of DNA. How much nuclear DNA did that cell have in G1?
0.4 pg
0.8 pg
1.6 pg
1.6 pg in animals, but 3.2 pg in plants
1.6 pg in plants, but 3.2 pg in animals
Of the different types of chemical bonds, the strongest bond in biological systems is the ___ bond.
ionic
van der waals
hydrogen
covalent
hydrophobic
membrane phospholipids have
hydrophilic heads outward and exposed to water (a)
hydrophobic tails inward and never exposed to water (b)
hydrophobic heads outwards and exposed to water (c)
both a and b
A species consists of
all the populations found in an ecosystem
a group of individual organisms in an area that do not interact
all the populations of different organisms that live together in a particular area
all the populations found in a community
a group of individuals of the same type of organism that share a common genome
Monomers are joined together by ___ and broken down by ____.
phosphorylation; dephosphorylation
acids; bases
hydrogen; oxygen
proteins; lipids
condensation; hydrolysis
If 30 percent of the bases in a double-stranded DNA molecule are T, ____ percent must be G
20
30
40
50
60
Which statement concerning genetic information in most cells is true?
A single DNA nucleotide codes for a single amino acid
the flow of information in a cell is from DNA to protein to RNA
the flow of information in a cell is from DNA - RNA -protein
the entire DNA molecule is copied to RNA during DNA replication
the flow of information in a cell is from protein - RNA - DNA
A hydrolysis reaction requires
oxygen
a hydroxyl group
a carboxyl group
water
hydrogen
Regulation of the cell cycle is dependent on cyclins and cyclin dependent kinases. The key that allows a cell to progress beyond the restriction point is
the presence of cyclin
the presence of external signals from growth factors
the presence of cyclin and CDK
phosphorylation of RB by CDK
the absence of cyclin
the enzyme that unwinds the DNA prior to replication is called
single stranded DNA binding protein
DNA ligase
helicase
DNA polymerase III
primase
the nitrogenous bases of the two complementary strands in the DNA double helix are held together by
covalent and hydrogen bonds
covalent bonds
van der Waals forces and covalent bonds
hydrogen bonds
van der Waals forces
which of the following statement about DNA and RNA is true?
DNA contains pentose sugars, whereas RNA contains hexose sugars
DNA is a polymer, whereas RNA is a monomer
In DNA, A pairs with T, whereas in RNA, A pairs with U
DNA has uracil, whereas RNA has thymine
DNA usually has one polynucleotide strand, whereas RNA usually has two stands
According to the principle of complementary base pairing, purines pair with
prymidines
uracil
deoxyribose sugars
guanine
adenine
