if you want to remove an article from website contact us from top.

    dairy cattle were unknown in thai culture until recently, and 97 percent of thai people are lactose intolerant as adults. which explanation for such widespread lactose intolerance is most likely correct?

    James

    Guys, does anyone know the answer?

    get dairy cattle were unknown in thai culture until recently, and 97 percent of thai people are lactose intolerant as adults. which explanation for such widespread lactose intolerance is most likely correct? from EN Bilgi.

    Lactose intolerance in Thai adults

    Lactose intolerance is common in Thai adults who ingest cow's milk but its incidence has not been clearly defined The authors evaluated 45 volunteers (15 males, 35 females), aged 21-31 yrs old, who drank one 240-ml box of milk daily. A Lactose tolerance test was performed using a breath-hydrogen tes …

    . 2004 Dec;87(12):1501-5.

    Lactose intolerance in Thai adults

    Narumon Densupsoontorn  1 , Pipop Jirapinyo, Nuchnoi Thamonsiri, Sasitorn Chantaratin, Renu Wongarn

    Affiliations

    Affiliation

    1 Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand. [email protected]

    PMID: 15822548

    Lactose intolerance in Thai adults

    Narumon Densupsoontorn et al. J Med Assoc Thai. 2004 Dec.

    . 2004 Dec;87(12):1501-5.

    Authors

    Narumon Densupsoontorn  1 , Pipop Jirapinyo, Nuchnoi Thamonsiri, Sasitorn Chantaratin, Renu Wongarn

    Affiliation

    1 Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand. [email protected]

    PMID: 15822548

    Abstract

    Lactose intolerance is common in Thai adults who ingest cow's milk but its incidence has not been clearly defined The authors evaluated 45 volunteers (15 males, 35 females), aged 21-31 yrs old, who drank one 240-ml box of milk daily. A Lactose tolerance test was performed using a breath-hydrogen test (BHT) after oral intake of 25 g of lactose dissolved in 250 ml of water The presence of gastrointestinal symptoms of lactose intolerance, flatulence, abdominal pain and diarrhea, were recorded Twenty-one subjects (47%) were categorized as lactose malabsorbers and intolerant, two subjects (4%) were malabsorbers but tolerant, and 22 of 45 (49%) were absorbers and tolerant. The incidence of lactose malabsorption was, thus, 51%; symptoms of intolerance were found in 21 of the 23 malabsorbers, making the incidence of lactose intolerance 47%. In the lactose malabsorbant and intolerant group, the more breath-hydrogen (H) the more symptoms observed All subjects who had a negative breath-H2 test had no symptoms. The breath-H2 test should be used as a standard method to evaluate lactose absorption and lactose tolerance. The incidence of lactose intolerance has decreased from the past and the symptoms are not so severe that the people limit the consumption of milk since it is a major source of food containing good quality of protein and calcium.

    Similar articles

    [Lactase deficiency and lactose intolerance-related symptoms in adult healthy subjects from western France].

    Cloarec D, et al. Gastroenterol Clin Biol. 1991. PMID: 1752368 French.

    A comparison of symptoms after the consumption of milk or lactose-hydrolyzed milk by people with self-reported severe lactose intolerance.

    Suarez FL, et al. N Engl J Med. 1995. PMID: 7776987 Clinical Trial.

    Lactose intolerance and intestinal villi morphology in Thai people.

    Thong-Ngam D, et al. J Med Assoc Thai. 2001. PMID: 11758841

    Lactose intolerance.

    Swagerty DL Jr, et al. Am Fam Physician. 2002. PMID: 12018807 Review.

    [Lactose intolerance. Its definition, its prevalence in Mexico, and its implications in milk consumption].

    Palma M, et al. Rev Invest Clin. 1996. PMID: 9122545 Review. Spanish.

    See all similar articles

    Cited by 1 article

    Lactose-free milk prolonged endurance capacity in lactose intolerant Asian males.

    Sudsa-Ard K, et al. J Int Soc Sports Nutr. 2014. PMID: 25374482 Free PMC article.

    MeSH terms

    MeSH terms Related information

    MedGen PubChem Compound PubChem Substance

    LinkOut - more resources

    Medical

    MedlinePlus Health Information

    Miscellaneous

    NCI CPTAC Assay Portal

    Source : pubmed.ncbi.nlm.nih.gov

    BIOS 100 Exam I: Carbohydrates Flashcards

    sugar Learn with flashcards, games, and more — for free.

    BIOS 100 Exam I: Carbohydrates

    Unmodified sugars (those with the formula C n H2 n O n ) can have ...

    (a) H covalently bound to the C of a C=O group.

    (b) A C atom that is covalently bound to three H atoms.

    (c) The formula C3H6O3.

    (d) Both (a) and (c).

    (e) Both (b) and (c).

    Click card to see definition 👆

    (d) Both (a) and (c).

    The best choice! Glucose is one of many sugars that have H bound to C=O; they're called aldoses. The simplest sugar has the formula C3H6O3.

    Click again to see term 👆

    What is the LEAST that two molecules can differ, and still be called different kinds of sugars?

    (a) The number of C atoms differs.

    (b) One is a ring, the other is linear.

    (c) The orientation of an OH group differs.

    (d) The location of the carbonyl group differs.

    (e) None of the above.

    Click card to see definition 👆

    (c) The orientation of an OH group differs.

    In the open-chain form, two sugars may differ in the orientation (right or left) of just one OH group.

    Click again to see term 👆

    1/36 Created by seiho sugar

    Textbook solutions for this set

    Biology 1st Edition

    Kenneth R. Miller, Levine

    2,470 explanations

    Biology Study Workbook A

    1st Edition

    Kenneth R. Miller, Levine

    2,875 explanations

    Search for a textbook or question

    Terms in this set (36)

    Unmodified sugars (those with the formula C n H2 n O n ) can have ...

    (a) H covalently bound to the C of a C=O group.

    (b) A C atom that is covalently bound to three H atoms.

    (c) The formula C3H6O3.

    (d) Both (a) and (c).

    (e) Both (b) and (c).

    (d) Both (a) and (c).

    The best choice! Glucose is one of many sugars that have H bound to C=O; they're called aldoses. The simplest sugar has the formula C3H6O3.

    What is the LEAST that two molecules can differ, and still be called different kinds of sugars?

    (a) The number of C atoms differs.

    (b) One is a ring, the other is linear.

    (c) The orientation of an OH group differs.

    (d) The location of the carbonyl group differs.

    (e) None of the above.

    (c) The orientation of an OH group differs.

    In the open-chain form, two sugars may differ in the orientation (right or left) of just one OH group.

    A molecule has the formula C n H2 n O n . What else does it need to be an unmodified monosaccharide?

    (a) Nothing.

    (b) A carboxyl group.

    (c) O bound to every C.

    (d) At least 5 carbon atoms.

    (e) Both (b) and (c).

    (c) O bound to every C.

    If a monosaccharide has C without O attached, it's been modified.

    The alpha and beta forms of glucose, found in starch and cellulose, differ in ...

    (a) Whether the molecule is a ring or an open chain.

    (b) Whether the ring contains five or six C atoms.

    (c) Whether the first C atom is bound to one or two O atoms.

    (d) How one of the -OH groups is oriented.

    (e) None of the above.

    (d) How one of the -OH groups is oriented.

    One particular -OH group points to one side of the ring in alpha glucose; the other side in beta glucose.

    What happens when glucose forms a ring?

    (a) The molecule loses its carbonyl group.

    (b) The molecule loses one O atom.

    (c) The sixth C atom binds to the first C atom.

    (d) Both (b) and (c).

    (e) Both (a) and (c).

    (a) The molecule loses its carbonyl group.

    The C=O group becomes -O-C-OH.

    A sugar can have ...

    (a) H covalently bound to the C of a C=O group.

    (b) a C atom that is covalently bound to three H atoms.

    (c) the formula C5H8O5.

    (d) Both (a) and (c).

    (e) Both (b) and (c).

    (a) H covalently bound to the C of a C=O group.

    This occurs in linear aldoses such as glucose.

    What is an enantiomere?

    They're mirror images, and that makes them enantiomers.

    Which feature is shared by all monosaccharides?

    (a) In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.

    (b) They are all pentoses.

    (c) In their linear forms, they all contain a carboxyl and several hydroxyl functional groups.

    (d) They all contain more than one sugar.

    (a) In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.

    Note that in aqueous solution monosaccharides tend to exist in cyclic, not linear, forms.

    A sugar that has the chemical formula C5H10O5 would be characterized as a(n) _____.

    (a) Hexose (b) Triose (c) Oligosaccharide (d) Pentose (d) Pentose

    Pentose is the general term for a five carbon sugar such as ribose.

    The _____ functional group can always be found in a carbohydrate molecule.

    (a) Amino (b) Hydroxyl (c) Phosphate (d) Water (b) Hydroxyl

    Carbohydrates are aldehydes or ketones with multiple hydroxyl groups.

    Sign up and see the remaining cards. It’s free!

    Boost your grades with unlimited access to millions of flashcards, games and more.

    Continue with Google

    Continue with Facebook

    Sets with similar terms

    chapter 5 carbohydrates

    37 terms Denisa_Cocan ch 5 39 terms yazmin134 Chapter 5 Homework 28 terms elegantmuffin

    Source : quizlet.com

    Exam 1 Answers Flashcards

    Study Exam 1 Answers flashcards. Create flashcards for FREE and quiz yourself with an interactive flipper.

    Skip to main content

    Exam 1 Answers

    42cards Princess S. Biology

    Introduction To Biology

    Over the past several decades, natural selection has caused populations of (an infectious wound

    bacterium) to evolve resistance to most antibiotics. If antibiotic use were stopped, what would you predict would

    happen to these populations?

    The frequency of nonresistant forms will increase in these populations.

    Consider the following reaction at equilibrium: CO2 + H2O ↔ H2CO3. What would be the effect of adding

    additional CO2 and H20?

    drive the equilibrium dynamics to the right and H2CO3 levels will increase

    Which of the following involves an increase in entropy?

    hydrolysis

    The "heat" in chili peppers is due to a molecule called capsaicin. Suppose you breed only the hottest chili peppers over

    many generations, predict the characteristics of the resulting individuals.

    more capsaicin

    Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?

    Carbs are reduced molecules that have high-energy electrons

    Consider the buffering example discussed in class. Acetic acid (CH3COOH) and acetate (CH3COO- ) form a

    buffer system. Which one of the buffer components would decrease in concentration if we were to add a strong

    acid to the solution containing the buffer?

    B) CH3COO-

    Which of the following linkages would you expect to find at a branch point in glycogen or amylopectin?

    α-1,6-glycosidic linkage

    In what important way does a competitive inhibitor differ from an allosteric inhibitor?

    A competitive inhibitor binds to the active site, whereas an allosteric inhibitor binds to a site other than the active site.

    In the diagram below, "A" is _____ ; "B" is _____.

    the common ancestor of life; the common ancestor of Archaea and Eukaryota

    How many electrons are involved in a triple covalent bond?

    six

    If an atom has a charge of +2, which of the following must be true?

    It has two more protons than electrons.

    An atom has five electrons in its valence shell. How many single covalent bonds would you expect it to form in most

    circumstances? three

    What holds electrons in a covalent bond?

    The negative charges on the electrons are attracted by the positive charges on both nuclei.

    When one of the atoms involved in a covalent bond has an electronegativity equal to the other atom, what type of

    bond results?

    a nonpolar covalent bond

    You need to write down information about a molecule, but need to indicate only which atoms it contains and how many of each. Which representation would work best?

    molecular formula

    How do the α and β forms of glucose differ?

    Their ring structures differ in the location of a hydroxyl group.

    Consider the buffering example discussed in class. Acetic acid (CH3COOH) and acetate (CH3COO- ) form a

    buffer system. Which one of the buffer components would increase in concentration if we were to add a strong

    base to the solution containing the buffer?

    CH3COO-

    A restriction enzyme cuts which particular molecule we discussed in class?

    DNA

    Suppose you discovered a new amino acid. Its R-group contains some hydrogen and carbon atoms, and a large number of oxygen atoms. Predict the behavior of this amino acid.

    It is hydrophobic

    You disrupt all hydrogen bonds in a protein.  What level of structure will be preserved?

    primary structure

    Nucleic acids have a definite polarity, or directionality. Stated another way, one end of the molecule is different from the other end. How are these ends described?

    One end has an unlinked 3’ carbon; the other end has an unlinked 5’ carbon.

    do chemical reactions tend to speed up when the concentration of the reactants is increased?

    The reactants collide more often.

    If you were going to develop a new antibiotic against bacteria, you would probably need to become an expert on which of these carbohydrates?

    peptidoglycan

    The functional (R) groups of amino acids _____.

    may be hydrophobic or hydrophilic

    In solution, why do hydrolysis reactions occur more readily than condensation reactions?

    Hydrolysis increases entropy and is exothermic

    An enzyme has a total of four active sites. When you denature the molecule and study its composition, you find that

    each active site occurs on a different polypeptide. Which of the following hypotheses does this observation support?

    The protein has quaternary structure.

    What type of interaction is directly responsible for the formation of protein secondary structure?

    hydrogen bonds between sections of the polypeptide backbone

    Which of the following best describes DNA's secondary structure?

    double antiparallel helical strands

    If the primary structure of a protein is incorrect

    any higher level folding of the protein will be incorrect.

    Which of the following includes all of the pyrimidines found in RNA and/or DNA?

    cytosine, uracil, and thymine

    Enzyme-catalyzed reactions increase in rate very rapidly at low substrate concentrations but plateau at higher substrate concentrations Why?

    At high substrate concentrations, the enzyme molecules present are working at maximal speed and are unable to further increase the rate of reaction.

    Source : www.chegg.com

    Do you want to see answer or more ?
    James 9 day ago
    4

    Guys, does anyone know the answer?

    Click For Answer