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TLS Online TPP Program

#Question id: 4128

Which of the following statements about tRNA molecules is false?

#Unit 3. Fundamental Processes

  1. A, C, G, and U are the only bases present in the molecule.

  2. Although composed of a single strand of RNA, each molecule contains several short, double-helical regions.

  3. Any given tRNA will accept only one specific amino acid.

  4. The amino acid attachment is always to an A nucleotide at the 3' end of the molecule.

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TLS Online TPP Program

#Question id: 7278

#Unit 5. Developmental Biology

The following demonstrates the blastocoel formation in the mammals. Which of the following statement is correct?
TLS Online TPP Program

#Question id: 10328

#Unit 9. Diversity of Life Forms

The term that is most appropriately associated with clade is
TLS Online TPP Program

#Question id: 5327

#Unit 8. Inheritance Biology

In the human pedigree shown here, the daughter indicated by the black circle (II-1) has a form of deafness determined by a recessive allele. What is the probability that the phenotypically normal son (II 3) is heterozygous for the gene?
TLS Online TPP Program

#Question id: 11991

#Unit 10. Ecological Principles

The success with which plants extend their range northward following glacial retreat is best determined by
TLS Online TPP Program

#Question id: 1238

#Unit 4. Cell Communication and Cell Signaling

Which of the following can lead to loss-of-heterozygosity in a tumor-suppressor gene?

a. deletion of the normal copy                       

b. non dysjunction during mitosis

c. somatic mutation of the normal copy

d. mitotic recombination between a wild-type and mutant allele