Elastin, the most elastic material known, is found only in insects and some crustaceans
Indicate whether the statement is true or false.
ANSWER: False - Resilin
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Which of the following is not true of the second step of translational elongation in bacteria?
A. The carboxyl group oxygen of the A-site amino acid is the nucleophile in peptide bond formation. B. A peptide bond is formed between the two amino acids bound by the tRNAs in the A and Psites. C. The growing polypeptide chain is transferred to the tRNA in the A site. D. The ?-amino group of the A-site amino acid attacks the carbonyl carbon of the P-site amino acid.
Which statement is false?
a. A molecule is made of at least two atoms. b. Compounds are made of elements. c. Two atoms of oxygen make a molecule of oxygen. d. Proportions of elements in compounds vary according to their source in nature. e. Elements are found in compounds and molecules
Bacterial endospores are easily damaged by heat and drying
Indicate whether the statement is true or false
Tay Sachs is a lysosomal storage disease that is inherited in an autosomal recessive manner (T= dominant allele; t = recessive allele). Individuals with Tay Sachs have a defect in the gene encoding hexosaminidase A, a lysosomal enzyme that breaks down cell membrane components called gangliosides. The inability to break down gangliosides causes harmful quantities of this lipid to accumulate in nerve cells of the brain, eventually leading to premature death of affected cells. There is no known cure for the disease, and death usually occurs by age 4. Jack and Jill have a child who has Tay-Sachs. What do you know about the genotypes of Jack and Jill?
A. Its impossible to tell. Since both are adults, they do not have the disease. But, they could either be TT or Tt B. Both are heterozygous C. Both are tt D. One is TT and the other is tt E. Both are TT