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WorksheetsBIO 101
Total questions: 40
Worksheet time: 20mins
What is the primary characteristic that distinguishes a Scientific Theory from a mere hypothesis?
It is a proposed explanation based on a single observation.
It is always proven to be absolutely true and unchangeable.
It is a tentative statement that must be falsified to be accepted.
It has rigorously withstood repeated testing and evaluation by numerous experiments over time.
Which level of organization represents all the living things and abiotic (non-living) things in a particular area?
Organ System.
Ecosystem.
Community.
Population.
Which characteristic of life refers to the ability of an organism to maintain a stable, constant internal balance despite external changes?
Regulation.
Energy Processing.
Homeostasis.
Reproduction.
Which of the following organisms are classified as Eukaryotes?
Organisms without a membrane-bound nucleus.
Only single-celled organisms.
Bacteria and Fungi.
Plants, Animals, and Fungi.
In a controlled experiment, which variable is the outcome being measured or recorded that is predicted to be affected by the manipulation?
Independent Variable (IV).
Dependent Variable (DV).
Control Group.
Standardized Variable (SV).
Which element is considered the most versatile and prominent element of life and forms the backbone of all biomolecules?
Carbon (C).
Oxygen (O).
Hydrogen (H).
Nitrogen (N).
Which class of macromolecules provides long-term, high-density stored energy reserves and is characterized by being hydrophobic?
Proteins.
Nucleic Acids.
Lipids.
Carbohydrates.
The small, repeating monomer units that make up carbohydrate polymers (polysaccharides) are called:
Monosaccharides.
Amino acids.
Fatty acids.
Nucleotides.
What is the specific type of covalent bond that links amino acids together to form the primary structure of a protein?
Phosphodiester bond.
Ester bond.
Peptide bond.
Glycosidic bond.
The chemical reaction that breaks down a polymer into its constituent monomers by adding a water molecule is known as:
Polymerization.
Hydrolysis.
Dehydration reaction.
Condensation.
According to Chargaff's rules, if a sample of double-helical DNA contains 20% Guanine (G), what is the percentage of Adenine (A)?
40%.
80%.
20%.
30%.
The two strands of the DNA double helix are held together by which type of weak bond between the nitrogenous bases?
Covalent bonds.
Hydrogen bonds.
Ionic bonds.
Phosphodiester bonds.
The main structural difference between DNA and RNA that makes DNA more stable is:
DNA contains the sugar deoxyribose, while RNA contains ribose.
DNA uses Uracil (U), while RNA uses Thymine (T).
DNA is a single strand, while RNA is a double strand.
DNA is only found in the cytoplasm, while RNA is only found in the nucleus.
The mechanism of DNA replication is described as semiconservative because each new DNA molecule consists of:
Two entirely new strands.
One original parental strand and one newly synthesized strand.
Two strands randomly mixed with new and old segments.
Two original parental strands.
Which DNA replication enzyme is responsible for unwinding the double helix to create the replication fork?
DNA Helicase.
DNA Polymerase III.
DNA Ligase.
RNA Primase.
The short, discontinuous DNA segments synthesized on the lagging strand are known as:
Okazaki Fragments.
RNA Primers.
Template Strands.
Telomeres.
What is the name of the overall process where the genetic information in mRNA is converted into an amino acid sequence (protein)?
Replication.
Transcription.
Gene Expression.
Translation.
The specific region on the DNA where RNA Polymerase II binds to initiate transcription is often signaled by what regulatory sequence?
The AUG Start Codon.
The TATA box
The P-site.
An Okazaki Fragment.
What three-base sequence on the tRNA molecule must be perfectly complementary to the codon on the mRNA?
Anticodon.
Stop Codon.
Codon.
Triplet.
A feature of the genetic code where most amino acids are specified by more than one codon is called:
Degeneracy
Universality.
Commaless.
Nonoverlapping.
Which codon serves as the universal START codon for translation, and what amino acid does it specify?
UAG, specifying Methionine.
UAA, specifying Serine.
AUG, specifying Methionine.
UGA, specifying Valine.
What level of protein structure is defined solely by the exact linear sequence of amino acids linked by peptide bonds?
Primary structure.
Secondary structure.
Quaternary structure.
Tertiary structure.
A collection of two or more functionally related organs (e.g., the digestive system) is defined as:
A Community.
An Organ System.
An Organism.
A Population.
The biological theme that states 'the design dictates the job,' where the unique shape of a biological part determines what it does, is called:
Structure and Function.
Homeostasis.
Regulation.
Adaptation.
Inductive reasoning involves drawing a broad general conclusion based on:
A pre-established general principle.
A single observation that is proven true.
The result of a positive control experiment.
A set of specific, repeated observations.
Which enzyme is responsible for removing the RNA primers and replacing them with DNA nucleotides on the lagging strand?
DNA Polymerase III.
RNA Primase.
DNA Polymerase I.
DNA Ligase.
Which statement correctly describes a Saturated Lipid?
The bonds between all carbons are single bonds.
It is typically liquid at room temperature.
It contains at least one double bond between carbons.
It is a polymer made of repeating monomers.
What are the three specific mRNA codons that signal the termination of translation?
UGA, UAA, or UAG.
AUG, GUG, UAA.
GAG, GAA, GUG.
UUU, UUC, UUA.
Organisms like Plants, Animals, and Fungi are characterized by cells that possess a membrane-bound nucleus and organelles, classifying them as:
Prokaryotes.
Viruses.
Eukaryotes.
Archaea.
The process where organisms create new individuals of their own kind to ensure the continuation of the species is called:
Reproduction.
Growth and Development.
Adaptation.
Homeostasis.
A hypothesis must be what two essential characteristics to be testable scientifically?
Confirmed and Logical.
Testable and Falsifiable.
Proven and Absolute.
General and Inductive.
The monomers that link together to form nucleic acid polymers (DNA and RNA) are known as:
Fatty Acids.
Amino Acids.
Monosaccharides.
Nucleotides.
If a DNA template strand has the sequence 3'-TAC-5', what is the sequence of the corresponding mRNA codon transcribed from it?
5'-ATG-3'.
5'-UAC-3'.
5'-AUG-3'.
5'-TAC-3'.
On which strand does DNA Polymerase III move away from the replication fork, requiring multiple primers?
The Lagging Strand.
The Template Strand.
The Leading Strand.
The Parent Strand.
Which macromolecule class acts as a catalyst for reactions (enzymes) and provides structural support (e.g., collagen)?
Nucleic Acids.
Carbohydrates.
Proteins.
Lipids.
Which type of RNA is a structural and catalytic molecule that makes up part of the ribosome itself?
rRNA (Ribosomal RNA).
tRNA (Transfer RNA).
snRNA (Small Nuclear RNA).
mRNA (Messenger RNA).
The theme that emphasizes that new and unique capabilities (like running or consciousness) arise from the complex interactions of components at lower levels is called:
Regulation.
Emergent Properties.
Order.
Homeostasis.
What is the purpose of the Control Group in a controlled experiment?
To provide a baseline reference point that lacks the factor being tested.
To be the group where all variables are manipulated.
To be the group that is kept secret from the researchers.
To serve as the group where the results are always positive.
The unique chemical structure of a phospholipid that makes it ideal for cell membranes is that it has:
Only saturated carbon bonds.
A single strand of nucleotides.
Three hydrophobic fatty acid tails.
A hydrophilic head region and a hydrophobic tail region.
Which enzyme acts as a molecular glue by catalyzing the formation of the final phosphodiester bond to seal fragments on the lagging strand?
DNA Ligase.
DNA Helicase.
DNA Polymerase I.
RNA Primase.
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