PDF Notes: Copy of Honors Biology Semester 2 Review Sheet

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    What surrounds the cell and controls what enters and exits?

    It is a selective barrier that maintains homeostasis.

    What is the function of the nucleus?

    It stores genetic information and regulates cell activities.

    How do eukaryotes differ from prokaryotes?

    Eukaryotes have a nucleus; prokaryotes do not.

    What type of microscope uses light to magnify objects?

    It allows for viewing live specimens.

    What is the role of the cytoplasm?

    It provides a medium for chemical reactions within the cell.

    What defines an organelle?

    It is a specialized structure within a cell that performs specific functions.

    What is the function of a vacuole?

    It stores nutrients and waste products.

    What is the role of lysosomes?

    They digest waste materials and cellular debris.

    What is the purpose of the cytoskeleton?

    It provides structural support and shape to the cell.

    What is the function of ribosomes?

    They synthesize proteins from amino acids.

    What distinguishes the endoplasmic reticulum?

    It is involved in protein and lipid synthesis.

    What does the Golgi apparatus do?

    It modifies, sorts, and packages proteins for secretion.

    What is the function of chloroplasts?

    They conduct photosynthesis to convert light energy into chemical energy.

    What is the role of mitochondria?

    They produce ATP through cellular respiration.

    What is the function of the cell wall?

    It provides protection and structural support to plant cells.

    What is a phospholipid bilayer?

    It forms the fundamental structure of cell membranes.

    What does selectively permeable mean?

    It allows certain substances to pass while blocking others.

    What is diffusion?

    It is the movement of molecules from high to low concentration.

    How does facilitated diffusion differ from simple diffusion?

    Facilitated diffusion requires transport proteins.

    What is osmosis?

    It is the diffusion of water across a selectively permeable membrane.

    What are aquaporins?

    They are channel proteins that facilitate water transport.

    What does isotonic mean?

    It describes a solution with equal solute concentration to another solution.

    What happens in a hypertonic solution?

    Cells lose water and may shrivel.

    What occurs in a hypotonic solution?

    Cells gain water and may burst.

    What is osmotic pressure?

    It is the pressure required to prevent water movement across a membrane.

    What is passive transport?

    It is the movement of substances across a membrane without energy use.

    What distinguishes active transport from passive transport?

    Active transport requires energy to move substances against their gradient.

    What is endocytosis?

    It is the process of taking substances into the cell by engulfing them.

    What is phagocytosis?

    It is the uptake of large particles or cells by engulfing them.

    What is exocytosis?

    It is the process of expelling materials from the cell.

    What is energy in biological terms?

    It is the capacity to do work or cause change.

    What does ATP stand for?

    Adenosine triphosphate, the energy currency of the cell.

    What is a heterotroph?

    An organism that obtains energy by consuming other organisms.

    What defines an autotroph?

    An organism that produces its own food through photosynthesis or chemosynthesis.

    What is photosynthesis?

    It is the process by which plants convert light energy into chemical energy.

    What role does chlorophyll play?

    It absorbs light energy for photosynthesis.

    What is the significance of light in photosynthesis?

    It provides the energy needed to drive the reactions.

    What is a pigment?

    It is a molecule that absorbs specific wavelengths of light.

    What is the function of thylakoids?

    They are the site of the light-dependent reactions in chloroplasts.

    What is stroma?

    It is the fluid-filled space in chloroplasts where the Calvin cycle occurs.

    What does NADP+ do?

    It acts as an electron carrier in photosynthesis.

    What happens during light-dependent reactions?

    Light energy is converted into chemical energy in the form of ATP and NADPH.

    What occurs during light-independent reactions?

    ATP and NADPH are used to synthesize glucose from carbon dioxide.

    What is a photosystem?

    It is a complex of proteins and pigments that captures light energy.

    What is the electron transport chain?

    It is a series of proteins that transfer electrons and pump protons to create a gradient.

    What is a gradient in biological systems?

    It is a difference in concentration across a membrane.

    What is ATP synthase?

    It is an enzyme that synthesizes ATP using the proton gradient.

    What is the Calvin cycle?

    It is the process that converts carbon dioxide into glucose using ATP and NADPH.

    What is C4 photosynthesis?

    It is a pathway that allows plants to fix carbon dioxide efficiently in hot conditions.

    What are CAM plants?

    They open their stomata at night to minimize water loss.

    What is chemosynthesis?

    It is the process of producing energy from chemical reactions, often in the absence of sunlight.

    What is a calorie?

    It is the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius.

    What is cellular respiration?

    It is the process of converting glucose into usable energy in the form of ATP.

    What distinguishes aerobic respiration?

    It requires oxygen to produce energy.

    What is anaerobic respiration?

    It occurs without oxygen and produces less energy than aerobic respiration.

    What happens during glycolysis?

    Glucose is broken down into pyruvate, producing ATP and NADH.

    What role does NAD+ play in cellular respiration?

    It acts as an electron carrier, facilitating energy transfer.

    What is the Krebs cycle?

    It is a series of reactions that produce ATP, NADH, and FADH2 from acetyl-CoA.

    What is the matrix in mitochondria?

    It is the innermost compartment where the Krebs cycle occurs.

    What happens in the electron transport chain during respiration?

    Electrons are transferred, leading to ATP production and water formation.

    What is fermentation?

    It is an anaerobic process that allows for energy production without oxygen.

    What is alcoholic fermentation?

    It converts sugars into alcohol and carbon dioxide.

    What is lactic acid fermentation?

    It converts sugars into lactic acid, often occurring in muscle cells.

    What is pyruvic acid?

    It is the end product of glycolysis and a key intermediate in cellular respiration.

    What are prokaryotes?

    They are unicellular organisms without a nucleus.

    What defines eukaryotes?

    They are organisms with complex cells containing a nucleus.

    What is cell division?

    It is the process by which a parent cell divides into two or more daughter cells.

    What is asexual reproduction?

    It involves a single parent producing genetically identical offspring.

    What is sexual reproduction?

    It involves two parents contributing genetic material to produce diverse offspring.

    What is the role of chromosomes?

    They carry genetic information in the form of DNA.

    What is chromatin?

    It is the relaxed form of DNA found in the nucleus during interphase.

    What is binary fission?

    It is a method of asexual reproduction in prokaryotes where the cell divides into two.

    What is the cell cycle?

    It is the series of stages that a cell goes through to divide and replicate.

    What happens during interphase?

    The cell grows and prepares for division.

    What occurs during mitosis?

    The cell's chromosomes are separated into two new nuclei.

    What is cytokinesis?

    It is the division of the cytoplasm, resulting in two separate cells.

    What happens during prophase?

    Chromosomes condense and the nuclear envelope breaks down.

    What occurs during metaphase?

    Chromosomes align at the cell's equatorial plane.

    What happens during anaphase?

    Sister chromatids are pulled apart to opposite poles of the cell.

    What occurs during telophase?

    Nuclear envelopes reform around the separated chromosomes.

    What are centrioles?

    They are structures that help organize the mitotic spindle during cell division.

    What is a centromere?

    It is the region where sister chromatids are joined together.

    What is a chromatid?

    It is one half of a duplicated chromosome.

    What role do cyclins play in the cell cycle?

    They regulate the timing of the cell cycle events.

    What are growth factors?

    They are proteins that stimulate cell division and growth.

    What is apoptosis?

    It is programmed cell death that eliminates damaged or unnecessary cells.

    What causes cancer?

    It results from uncontrolled cell division due to mutations.

    What is a tumor?

    It is a mass of abnormal cells that can be benign or malignant.

    What distinguishes malignant tumors from benign tumors?

    Malignant tumors invade surrounding tissues and can metastasize.

    What is an embryo?

    It is an early stage of development in multicellular organisms.

    What is a blastocyst?

    It is a structure formed in the early development of mammals.

    What is differentiation?

    It is the process by which cells become specialized for specific functions.

    What are totipotent stem cells?

    They can develop into any cell type in the body.

    What are pluripotent stem cells?

    They can develop into almost any cell type but not all.

    What are multipotent stem cells?

    They can develop into a limited range of cell types.

    What is genetics?

    It is the study of heredity and variation in organisms.

    What is fertilization?

    It is the union of sperm and egg to form a zygote.

    What is a trait?

    It is a characteristic that is inherited from parents.

    What are hybrids?

    They are offspring resulting from the cross of two different species or varieties.

    What are genes?

    They are segments of DNA that code for proteins.

    What are alleles?

    They are different forms of a gene that can exist at a specific locus.

    What does the principle of dominance state?

    Some alleles are dominant and mask the expression of others.

    What is segregation in genetics?

    It is the separation of alleles during gamete formation.

    What are gametes?

    They are reproductive cells that carry half the genetic information.

    What is probability in genetics?

    It is the likelihood of a particular genetic outcome.

    What does homozygous mean?

    It describes an organism with two identical alleles for a trait.

    What does heterozygous mean?

    It describes an organism with two different alleles for a trait.

    What is phenotype?

    It is the observable characteristics of an organism.

    What is genotype?

    It is the genetic makeup of an organism.

    What is a Punnett square?

    It is a diagram used to predict genetic outcomes of a cross.

    What does independent assortment refer to?

    It is the random distribution of alleles during gamete formation.

    What is incomplete dominance?

    It is a genetic situation where neither allele is completely dominant.

    What is codominance?

    It is when both alleles in a heterozygote are fully expressed.

    What are multiple alleles?

    They are more than two alleles for a genetic trait.

    What is a polygenic trait?

    It is a trait controlled by multiple genes.

    What are homologous chromosomes?

    They are pairs of chromosomes that have the same structure and gene sequence.

    What does diploid mean?

    It describes a cell with two complete sets of chromosomes.

    What does haploid mean?

    It describes a cell with one complete set of chromosomes.

    What is meiosis?

    It is the process of cell division that produces gametes.

    What is a tetrad?

    It is a group of four chromatids formed during meiosis.

    What is crossing over?

    It is the exchange of genetic material between homologous chromosomes during meiosis.

    What is a zygote?

    It is the fertilized egg that results from the union of sperm and egg.

    What is gene linkage?

    It is the tendency of genes located close together on a chromosome to be inherited together.

    What is a gene map?

    It is a diagram that shows the relative positions of genes on a chromosome.

    What is transformation in genetics?

    It is the process by which a cell takes up foreign DNA from its environment.

    What is a bacteriophage?

    It is a virus that infects bacteria.

    What is DNA?

    It is the molecule that carries genetic information.

    What is a nucleotide?

    It is the building block of DNA, consisting of a sugar, phosphate, and nitrogen base.

    What does antiparallel mean in DNA structure?

    It describes the opposite orientation of the two strands of DNA.

    What is a double helix?

    It is the twisted ladder structure of DNA.

    What is replication in DNA?

    It is the process of copying DNA before cell division.

    What are nitrogen bases?

    They are the components of DNA that encode genetic information.

    What are base pairs?

    They are pairs of nitrogenous bases that connect the two strands of DNA.

    What are phosphate groups?

    They are part of the backbone of DNA and RNA.

    What is deoxyribose sugar?

    It is the sugar component of DNA nucleotides.