BIOLOGY PROCTORED EXAM PENN FOSTER 2024-
2025 NEWEST VERSION| CONTAINS 300+
QUESTIONS & CORRECT DETAILED ANSWERS
ALREADY GRADED A+/ BIOLOGY PENN FOSTER
EXAM (BRAND NEW!!)
Assume that the allele for curly hair dominates the allele for straight hair. If a homozygous man with straight hair marries a homozygous curly-haired woman, we would expect their children to display which phenotypes? - ANSWER-All would have curly hair
Which of the following processes occurs during meiosis but not mitosis?
- Cytokinesis
- Telophase
- Cytogenesis
- Crossing-Over - ANSWER-Crossing-over
Testing has identified an autosomal recessive disorder in which the red blood cells are misshapen and irregular. This person probably suffers from - ANSWER-Sickle cell disease
Which type of RNA carries the instructions for building proteins? - ANSWER- mRNA
What base only occurs in RNA? - ANSWER-Uracil
In DNA replication, one of the two old strands of DNA remains as it was.Therefore DNA replication is called - ANSWER-Semiconservative
The Watson and Crick model of DNA led to the discovery of - ANSWER- Complementary base pairing
The correct base pairing for DNA - ANSWER-A-T, G-C
During DNA replication, enzymes called DNA ( ) help fill in the gaps between the portions of replicated DNA to form a continuous strand. - ANSWER-Ligase
Which strand of DNA is a complement to T-A-G-G-T-C-A? - ANSWER- A-T-
C-C-A-G-T
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In the context of gene mutations, if a codon triplet makes no sense in respect to any protein used by the organism, it's called a ( ) mutation. - ANSWER- Frameshift
The sequence of all of the base pairs that compose the genes and intergenic DNA segments of an organism is called a - ANSWER-Genome
- ) is a DNA sequence that controls transcription in a prokaryote - ANSWER-
An operon
Loosely packed chromatin in eukaryotic cells is called - ANSWER- Euchromatin
In eukaryotes, transcription ( ) are DNA-binding proteins that assist RNA polymerase to bind to a promoter. - ANSWER-Factors
In general, a cell-signaling pathway begins when - ANSWER-A chemical signal binds to a receptor protein
- ) cloning refers to producing cells that might be used to repair spinal tissue
injuries. - ANSWER-Therapeutic
- ) act as a carrier for foreign DNA - ANSWER-Vectors
The first step of the ( ) process denatures DNA at 95 degrees C to separate the strands - ANSWER-Polymerase chain reaction
Cells are - ANSWER-the smallest unit of life
The correct order of biological organization - ANSWER-Population, community, ecosystem, biosphere
Adaptation - ANSWER-A modification that makes organisms more suited to their environment
Archaea - ANSWER-The life domain whose members live in very harsh environments, such as salt lakes and hot springs
During a scientific experiment, the control group is - ANSWER-identical to the experimental group in all areas except the variable being tested.
Proton - ANSWER-A subatomic particle that has a positive charge and that is found in the nucleus of an atom 2 / 3
octet rule - ANSWER-The concept that states: When an atom has two or more
electron shells, the outer shell will be most stable if it contains eight electrons
When two oxygen atoms join together what is formed - ANSWER-Molecule
The ( ) bond is s type of atomic bond in which atoms share electrons to produce a completed outer shell - ANSWER-Covalent
The polarity of water molecules causes them to be attracted to one another by a
- ) bond - ANSWER-Hydrogen
As the number of hydrogen ions in a solution increases, the pH of the solution - ANSWER-Decreases
During winter only the upper surface of a lake freezes, which allows for life to persist below the surface. Which of water's unique properties is responsible for this phenomenon? - ANSWER-Lower density as ice
The most abundant element by weight in the human body is - ANSWER- Oxygen
The polysaccharide structural carbohydrate most commonly used by living things is - ANSWER-Cellulose
Which of of the following functional groups is associated with fatty acids? - ANSWER-Carboxyl
The hard body parts of insects and crabs are composed of a polysaccharide called - ANSWER-Chitin
Cell membranes are composed mainly of which type of lipids? - ANSWER- Phospholipids
- ) proteins are made of polypeptide chains folded into rounded compact shapes
- ANSWER-Globular
When joined by a dehydration reaction, the covalent bond between the carboxyl groups of two amino acids is called a ( ) bond - ANSWER-Peptide
The sugar in RNA is - ANSWER-Ribose
Within cells, the synthesis of proteins occurs in the - ANSWER-Ribosomes
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