Week 10 Flashcards
What is the hybridization state of the carbon atom in methane (CH4)?
sp3
What is the shape of a methane (CH4) molecule?
Tetrahedral
Which element is not essential for life as we know it?
Rb, C,H, O or N?
Rb, Rubidium
Which bond is stronger: hydrogen or covalent?
Covalent bond
True or false
Water molecules can form hydrogen bonds?
True.
True or false
Methane molecules can form hydrogen bonds?
False
Is lactose a reducing or non-reducing sugar?
Lactose is a reducing sugar
Which functional groups can react together to form an O-glycosidic bond?
Alcohol group+ hemiacetal group.
The vast majority of carbohydrates found in Nature are?
D-isomers.
Which functional group is formed during the reaction between 2 monosaccharides to form a disaccharide?
Acetal group
The nucleus, an organelle found in eukaryotic cells, confines the __________, keeping them separated from other components of the cell.
chromosomes
Which of the following types of molecules are the major structural components of the cell membrane?
Phospholipids and proteins
Which of the following models forms the basis for our current understanding of the plasma membrane?
Fluid mosaic model proposed by Singer and Nicolson
Which type of microscope can produce a resolution of 0.2nm?
electron microscope
What is a common appropriate label for the thickness of a membrane?
5nm(nanometres)
What is the fluorescent microscope limited by for its resolving power?
the wavelength of visible light.
The __________ __________ is made up of two concentric membranes and is continuous with the membrane of the endoplasmic reticulum.
nuclear envelope
Central Dogma: The sequence of nucleotides in a particular segment of DNA (a gene) is _______ into an RNA molecule, which can then be ________ into the linear sequence of amino acids of a protein.
transcribed, translated
What is the First Law of Mendelian genetics?
Segregation: Each organism has two alleles of each gene, and one of these is passed on at random in each gamete
What is the Second Law of Mendelian genetics?
Independent Assortment: Alleles for separate traits are inherited independently of one another
Early biologists thought that the sperm contained a miniature human, which in turn contained even smaller humans inside it. What is this theory called?
Preformation
How did Louis Pasteur DISPROVE the theory of spontaneous generation?
He showed that sterilised (boiled) media in a “swan neck” flask remained sterile until the flask was tilted to allow contaminants to enter it.
What are the key differences between meiosis and mitosis?
Meiosis generates diversity and the resulting daughter cells are non-identical
Meiosis halves the chromosome number in the final product
Which observation DISPROVES the “blending” model of inheritance?
Offspring sometimes show recessive traits (e.g. blue eyes in humans, wrinkling in peas) even if neither parent shows the trait.
