The following statements are true: A bacteria s unable to grow on the sugar xylo
ID: 93056 • Letter: T
Question
The following statements are true: A bacteria s unable to grow on the sugar xylose i.e. use xylose as a source of carbon & energy. This bacteria develops mutations that gives it the ability to grow on xylose i.e. the mutation allows the bacteria to use xylose as a source of carton & energy. The question is about the mutant bacteria when it is grown as follows. When the mutant bacteria is grown in the complete absence of xylose (it never is exposed to xylose), the mutation is called a) beneficial b) conditional c) lethal d) silent e) mortal The appearance of an organism is the: a) phenotype b)genotype c) allotype d) idiotype The genetic composition (makeup) of an organism is: a) phenotype b) genotype c) allotype d) idiotype Which of the following is a polar covalent bond: a) C-C b)C-O c) O-O d) none of these Which of the following is a nonpolar covalent bond: a) C-H b) C-N c) C-O d)none In a well-designed experiment, the expected result based upon extensive previous experience is called the: a) experimental group b) extended group c) control group d) discographic group e) none of these A mutated form of a heritable trait whose frequency in a population will increase because of natural selection would be characterized as: a) beneficial b) conditional c) lethal d) silent e) mortal Which of these has an electrical charge of (-1): a) neutrino b) electron c) proton d) quark HCI is a strong acid. 2.0 times 10^-3 moles of HCl is added to 2.0 liter of pure water. What is the pH for the solution after the addition of the HCl to the water: a) 0 b) 1 c) 2 d) 3 e) 4 A buffer is: a) a weak acid b) a weak base c) both a weak acid and weak base d) none All covalent bonds are of the same strength, a) True b) False Ionic bonds are always strong. a) True b) False The observation that all life today employs ATP as the only usable energy is strong evidence for: a) intelligent design of life b) common ancestry for all life c) Lamarckian evolution d) biochemical diversity If a molecule has a molecular weight(mw) of 340 daltons (Da), then how many grams are required to make 0.1 mole: a) 1000 g b) 340 g c) 34 g d) 3.4 g An ionic bond between two atoms result from: a) a homozygous e" shell b) a shared e" pair where each partner contributes one e" to the par c) one atom donates an e" and the other accepts the e^- d) electrostatic repulsion orbitals with partial charge properties e) none (a, b, c, d) are correctExplanation / Answer
57. ANS: A. beneficial mutation
Mutations alter the nucleotide sequence of the DNA. They may affect the organism’s phenotype, which can play a key role in bacterial adaptation and transformation to changing environments. Some of these mutations even appear to be beneficial to the organism. When beneficial mutations are rare and selection is strong, positive selection results in a succession of selective sweeps.
58. ANS: A. Phenotype.
An individual's phenotype consists of the traits we can observe. These can include features of appearance, behavior, metabolism, or anything else we can detect.
59. ANS: B. Genotype
Genotype refers to the types of genes he or she has for a particular inheritable trait. Genotypes determine which characteristics an individual will express.
60. ANS: D. Non the of above
Covalent bond: In which the electron distribution between atoms is uneven. The electrons are shared unequally.
Ex: H2o.
61. ANS: D. Non the of above
Non-covalent bond: When two atoms of the same element involves in a covalent bond to form a molecule, the shared pair of electrons will be at the exact midway between the two atoms. This means the electrons are equally shared by the atoms.
Ex: O: + : O O::O or O=O
62. ANS: B. Extended experiment
The Extended experiment defines amount, degree, or range to which something about the work is extended.
66. ANS: C
A buffer is an aqueous solution that has a highly stable pH. If you add acid or base to a buffered solution, its pH will not change significantly. Similarly, adding water to a buffer or allowing water to evaporate will not change the pH of a buffer.
67. ANS: False
The Strength of Covalent Bonds Depends on the Overlap between the Valence Orbitals of the Bonded Atoms. The relative sizes of the region of space in which electrons are shared between them.
68. ANS: True.
The ionic bond is stronger than the alternative covalent bond. This is either because the covalent bond is weak (poor orbital overlap / mismatched orbital energies) or the ionisation energies are relatively small compared to the lattice enthalpy.
Please remind this note: Answering to many questions is against to CHEGG RULE, so I was answered more small questions.