Lectknancy

What is a similarity between a liver and kidney cell? - ANSWER-Both cells have the same DNA. Both cells are generated during the animal's embryological development. What are some differences between a liver and kidney cell? - ANSWER-Both cells express different genes, which produces different proteins. Both cells have different functions in the body. Which structure could be seen using an electron microscope? - ANSWER-Plasma membrane DNA Ribosomes Which structure could not be seen ...

What would be the most obvious outcome of repeated cell cycles consisting of S phase and M phase only? (a) Cells would not be able to replicate their DNA. (b) The mitotic spindle could not assemble. (c) Cells would get larger and larger. (d) The cells produced would get smaller and smaller. - ANSWER-d Which of the following events does not usually occur during interphase? (a) Cells grow in size. (b) The nuclear envelope breaks down. (c) DNA is replicated. (d) The centrosomes are dupli...

Cells - ANSWER-The basic unit from which a living organism is made; consists of an aqueous solution of organic molecules enclosed by a membrane. Cell Biology - ANSWER-The study of cells and their structure, function and behavior. Cilium (cilia) - ANSWER-Hairlike structure made of microtubules found on the surface of many eukaryotic cells; when present in large numbers, its rhythmic beating can drive the movement of fluid over the cell surface, as in the epithelium of lungs. DNA - ANSWER...

archaea - ANSWER-One of the two divisions of prokaryote, often found in hostile environments such as hot springs or concentrated brine. bacteria - ANSWER-Commonly used name for any prokaryotic organism, but more precisely refers to the eubacteria, the "true bacteria," one of the three major domains of life. Most are single-celled organisms. Some species of bacteria cause disease. cell - ANSWER-The basic unit from which living organisms are made, consisting of an aqueous solution of organ...

Which statement is true? Choose one: A. The heat released by an animal cell comes from the chemical bond energy present in the food molecules it metabolizes. B. A cell generates order by decreasing the entropy of its surroundings. C. The breakdown of food molecules generates heat, which cells then use to drive the synthesis of large molecules. D. A cell takes in heat from the environment to power its biosynthetic reactions, thereby obeying the second law of thermodynamics. E. Cells obey th...

Protein molecules - ANSWER-Long chains of amino acids held together by peptide bonds What are proteins referred to as? - ANSWER-Polypeptides (Amino acid chains are called polypeptide chains) What do proteins embedded in the plasma membrane form? - ANSWER-Channels and pumps that control the passage of nutrients and other small molecules into and out of the cell Enzyme function - ANSWER-Speed up (catalyze) chemical reactions Structural protein function - ANSWER-Provide mechanical s...

Predict what would happen to the secondary structure of a protein if an alcohol that disrupts hydrogen-bonding were added. Choose one or more: A. The β sheets would unfold, disrupting protein structure. B. The α helices would unfold, disrupting protein structure. C. Nothing would happen to the protein; hydrogen-bonding is not important for secondary structure. D. Individual amino acids would be hydrolyzed from the protein, disrupting protein structure. - ANSWER-A. The β sheets would unf...

DNA - ANSWER-Double stranded polynucleotide formed from two separate chains of covalently linked deoxyribonucleic units. It serves as the cell's store of genetic information that is transmitted from generation to generation. Double Helix - ANSWER-The typical structure of a DNA molecule in which the two complementary polynucleotide strands are wound around each other with base pairing between the strands. Base Pair - ANSWER-Two complementary nucleotides in an RNA or DNA molecule that are h...

Cancer - ANSWER-Disease caused by abnormal and uncontrolled cell proliferation, followed by invasion and colonization of body sites normally reserved for other cells DNA Ligase - ANSWER-Enzyme that reseals nicks that occur in the backbone of a DNA molecule (in the lab, can be used to join together two DNA fragments) DNA Polymerase - ANSWER-Makes DNA DNA Repair - ANSWER-Collective term used for the enzymatic processes that correct deleterious changes affecting the continuity or sequence ...

Housekeeping Proteins - ANSWER-Proteins common to many cell types, concerned with basic metabolic and structural functions. Regulatory DNA Sequences - ANSWER-DNA sequence to which a transcription regulator binds to determine when where & in what quantities a gene is to be transcribed into RNA. Transcription Regulators - ANSWER-Proteins that bind specifically to a regulatory DNA sequence; involved in controlling whether a gene is switched on or off; activator or repressor. Can coordinate th...