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TLS Online TPP Program

#Question id: 522

Yeast will normally convert pyruvate to ethanol. Why is this better for the yeast than a conversion to lactate?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Conversion to ethanol releases more NAD+ per mole than the conversion to lactate.

  2. The carbon atoms are more oxidized in ethanol than in lactate.

  3. Ethanol is neutral, but lactate production is accompanied by a sharp decrease in pH.

  4. Ethanol production is not better. Yeast normally produces ethanol and lactate in equilmolar amounts.

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TLS Online TPP Program

#Question id: 11908

#Unit 8. Inheritance Biology

What is the phenotype of a person who has XXXY sex chromosomes?
TLS Online TPP Program

#Question id: 11909

#Unit 8. Inheritance Biology

In the birds, butterflies and some reptiles, sex is still chromosomal, but the male that possesses two identical sex chromosome while the female has two different sex chromosome,  in this case which one is determining  sex?
TLS Online TPP Program

#Question id: 12173

#Unit 8. Inheritance Biology

Female with only one X chromosome is a characteristics of individual with
TLS Online TPP Program

#Question id: 12487

#Unit 8. Inheritance Biology

Neurofibromatosis type 1 is one of the most common autosomal dominant disorders. A woman with neurofibromatosis type 1 has an unaffected partner. Which of the following is correct regarding their children?
TLS Online TPP Program

#Question id: 12488

#Unit 8. Inheritance Biology

Retinoblastoma usually occurs as a sporadic event but in around 10% of cases there is a positive family history due to autosomal dominant inheritance. In these families the penetrance is approximately 80% (= 0.8). A woman with retinoblastoma, whose father and grandfather were also affected, has an unaffected partner with no relevant family history. Which of the following is correct regarding their children?
TLS Online TPP Program

#Question id: 12489

#Unit 8. Inheritance Biology

Achondroplasia shows autosomal dominant inheritance with complete penetrance. A man with achondroplasia has an unaffected partner of normal height. Their first two children are not affected. Which of the following is correct?