Practice Questions

TLS Online TPP Program

#Question id: 15286

In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the

#Unit 5. Developmental Biology

amount of morphogen that must bind to receptors to activate an intracellular signaling system.
concentrations of transcription factors required to activate particular genes
concentration at any point effectively provides positional information.
amount of morphogen that must bind to receptors to inactivate an extracellular signaling system.

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TLS Online TPP Program

#Question id: 23887

#Unit 13. Methods in Biology

Which of the following sequences in double-stranded DNA is most likely to be recognized as a cutting site for a restriction enzyme?

TLS Online TPP Program

#Question id: 23888

#Unit 13. Methods in Biology

A recessive allele usually results from a mutation that

a. disrupts expression of the gene.

b. alters the structure of the encoded protein leading to gain of function.

c. alters the structure of the encoded protein leading to loss of function.

d. increases the activity of the encoded protein.

TLS Online TPP Program

#Question id: 23889

#Unit 13. Methods in Biology

Temperature-sensitive mutations would be particularly useful for studying which of the following processes?

a. DNA synthesis

b. hormone secretion

c. protein synthesis

TLS Online TPP Program

#Question id: 23890

#Unit 13. Methods in Biology

Which of the following is an essential element of plasmids used as cloning vectors?

a. a centromere

c. an origin of replication

d. a drug resistance gene

TLS Online TPP Program

#Question id: 23891

#Unit 13. Methods in Biology

Which of the following is (are) used both in the polymerase chain reaction (PCR) and in DNA sequencing?

a. single-stranded DNA primers

b. deoxynucleotide triphosphates (dNTPs)

c. dideoxynucleotide triphosphates (ddNTPs)

d. DNA polymerase

TLS Online TPP Program

#Question id: 23892

#Unit 13. Methods in Biology

The restriction enzyme BglIl has the recognition sequence (A*GATCT) and cuts between the A and the G as indicated by the asterisk. DNA cut by which of the following restriction enzymes (given with their recognition sequences and cut sites) could be cloned into a plasmid cut with BgIII?