Practice Questions

TLS Online TPP Program

#Question id: 802

A single-stranded DNA molecule contains 40 nucleotides with equal amounts of A, C, G, and T. This DNA strand can combine with a complementary DNA strand to form a double-stranded DNA molecule. Which is a possible sequence and structure for this DNA molecule?

#Unit 1. Molecules and their Interaction Relevant to Biology

If the single-stranded molecule has the sequence 5’-(ATGC)10, then its double- stranded form could assume a Z-DNA structure.
If the single-stranded molecule has the sequence 5’-(GATC)10, then its double-stranded form could assume an H-DNA structure.
If the single-stranded molecule has the sequence 5’-(CTGA)10, then its double-stranded form could assume a hairpin structure.
If the single-stranded molecule has the sequence 5’-(TGAC)10, then its double-stranded form could assume a cruciform structure.

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TLS Online TPP Program

#Question id: 12593

#Unit 10. Ecological Principles

Use the following diagram of five islands formed at around the same time near a particular mainland and MacArthur and Wilson's island biogeography principles to answer the following questions.

Which island would likely exhibit the most impoverished species diversity?

TLS Online TPP Program

#Question id: 10191

#Unit 1. Molecules and their Interaction Relevant to Biology

Statements are given as

A. Primary kinetic isotope effects are rate changes due to isotopic substitution at a site of bond breaking in the rate determining step of a reaction.

B. Solvent shows primary kinetic isotope effect

C. Secondary kinetic isotope effects are rate changes due to isotopic substitutions at a site other than the bond breaking site in the rate determining step of the reaction.

D. Solvent shows primary kinetic isotope effect and secondary kinetic effect as well

Which of the following is correct combination of statements

TLS Online TPP Program

#Question id: 23288