BIOLOGY 2e

Why are ion channels necessary to transport ions into or out of a cell? Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane. Endocrine signals are transmitted more slowly than paracrine signals because ___________. the ligands are transported through the bloodstream and travel greater distances An organism's traits are determined by the specific combination of inherited _____. genes A diploid cell has_______ the number of chromosomes as a haplo...

Fungi typically display which type of life cycle? Select one: haploid-dominant The chain termination method of sequencing: uses labeled ddNTPs Binding of an RNA binding protein will __________ the stability of the RNA molecule. either increase or decrease What cell parts have the ability to disassemble and reform quickly? microfilaments and microtubules In which direction does DNA replication take place? Select one: 5'-3' Potassium has an atomic number of 19. What is its elect...

organization of life molecular, cellular, tissue, organ, organ system, organism, population, community, ecosystem, biosphere scientific method The process that starts with an observation that starts a question, which then becomes a testable hypothesis. A test is done with the hypothesis using recorded data, and if the hypothesis is rejected, then either the hypothesis gets changed or the procedures need to be redone. properties of life reproduction, growth and development, homeostasis, ener...

Cell Theory idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells prokaryotic cell cell lacking a nucleus and is a bacterial cell. eukaryotic cell cell that has a nucleus and other membrane-bound organelles Structures in both DNA, RNA, Cytoplasm, Ribosomes, Plasma Membrane fluid mosaic model model for structure Plasma Membrane phospolipid bilayer double layer of phospholip...

membrane potential & how it's maintained by sodium-potassium pump electrical charge difference (voltage) that occurs across the plasma The pump mantains the concentration gradient by exchanginf 2 K out for 1 NA in. Major features of primary active transport More substances across membrane Makes ATP Major features of facilitated diffusion Passive Using specialized proteins (channels carriers) Proteins to assist molecules in moving across cell Secondary active transport Form of act...

Which element is most predominant in the human body? a. Hydrogen b. Nitrogen c. Water d. Oxygen oxygen Which subatomic particle is positively charged? a. Electron b. Proton c. Neutron d. Isotope proton Water is polar (T/F) true. In a Nitrogen-Hydrogen (N-H) covalent bond, nitrogen is slightly _____________ charged. a. negatively b. positively negatively Water droplets stick to the leaves of plants because of _____________. a. adhesion b. cohesion adhesion Hydrogen bonds ar...

People who have leukemia, a cancer that affects white blood cells, are often given Cytarabine. This drug inhibits the synthesis of DNA. Which phase of the cell cycle is most affected by Cytarabine? S phase A single-celled organism can be classified as a prokaryote based on the absence of - a nucleus Cells pass through a G2 checkpoint before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired. Why is DNA damage repaired before cell...

Francis Bacon developed the scientific method Scientific Method a testable questions, hypothesis, experiment, analysis,report results Organization of life atom, molecule, macro-molecule, organelles, cell, tissue, organ, organ system, organism experiments are comparisons with control Properties of Life order, sensitivity or response to stimuli, reproduction, adaption, growth and development, homeostasis, energy processing, evolution response to simuli eating because you feel hungry; a ...

light microscope (LM) An optical instrument with lenses that refract (bend) visible light to magnify images of specimens. resolving power the microscope's ability to distinguish two adjacent structures as separate; the higher the resolution the better the clarity and detail. Magnification the process of enlarging an objects appearance electron microscope (EM) focuses a beam of electrons through the specimen or onto its surface Anthony van Leeuwenhoek used a single lens to observe sin...

Amino Acid Structure Tetrahedral alpha-carbon connected to an amino group, a carboxyl group and a variable R group, which determines the AA's properties Primary Protein Structure Consists of amino acids linked by peptide bonds forming the amino acid sequence Secondary Protein Structure Alpha-helices and Beta-sheets formed through hydrogen-bonding interactions between the atoms in the backbone of the molecule Tertiary Protein Structure Most stable; places polar Amino Acid's on the ex...