Practice Questions

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#Question id: 9193

Which of the following best describes the consequences of White-band disease in Caribbean coral reefs?

#SCPH06 I Botany

Staghorn coral has been decimated by the pathogen, and Elkhorn coral has taken its place.
Key habitat for lobsters, snappers, and other reef fishes has improved.
Algal species take the place of the dead coral, and the fish community is dominated by herbivores.
Algal species take over and the overall reef diversity increases due to increases in primary productivity.

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TLS Online TPP Program

#Question id: 15637

#SCPH28 | Zoology

You have isolated two mutations in the Lac operon that cause constitutive expression of Lac genes. You designate these mutants Lac1– and Lac2–. Making use of an F' that carries the Lac operon with the LacY gene mutated, you construct strains that you test for both ß-galactosidase activity and Lac permease activity with results shown below.

Classify each mutation as dominant or recessive and as cis- or trans-acting, giving the experimental result that allows you to arrive at each conclusion. Finally, deduce what type of Lac mutation best fits the properties of Lac 1– and of Lac 2–.

TLS Online TPP Program

#Question id: 11532

#I Life Science/ Life Sciences Group – I-V

Which of the following are the primary sites of IAA synthesis?

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#Question id: 1662

#SCPH05 I Biotechnology

What is the approximate number of D segment genes in the immunoglobulin heavy chain gene locus?

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#Question id: 3533

#SCPH06 I Botany

What would be the frequency of dominant phenotype for all character individuals from a mating of two AaBbCc individuals?

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#Question id: 273

#SCPH12 I Genetics

Stem-loop structures in RNA resemble the ________ form of double-helical DNA.