Practice Questions

TLS Online TPP Program

#Question id: 23860

RNAi methodology uses double-stranded pieces of RNA to trigger a breakdown or blocking of mRNA. For which of the following might it more possibly be useful?

#Unit 13. Methods in Biology

to raise the rate of production of a needed digestive enzyme
to decrease the production from a harmful gain-of-function mutated gene
to destroy an unwanted allele in a homozygous individual
to form a knockout organism that will not pass the deleted sequence to its progeny

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TLS Online TPP Program

#Question id: 28831

#Unit 2. Cellular Organization

Most microtubules in a cell consist of a simple tube is called____

TLS Online TPP Program

#Question id: 5747

#Unit 8. Inheritance Biology

Mosaicism is due to

TLS Online TPP Program

#Question id: 1435

#Unit 4. Cell Communication and Cell Signaling

Direct-acting carcinogens are those that:

TLS Online TPP Program

#Question id: 10139

#Unit 6. System Physiology – Plant

There are two distinct forms of rubisco. Form I is found in vascular plants, algae, and cyanobacteria; form II is confined to certain photosynthetic bacteria, Some statements about the Rubisco is given;

a.) A complex form I structure with eight identical large subunits each containing a catalytic site, and eight identical small subunits of uncertain function

b.) The form II rubisco of photosynthetic bacteria is simpler in structure, having two subunits that in many respects resemble the large subunits of the plant enzyme

c.) The plant enzyme has an exceptionally low turnover number; only three molecules of CO2 are fixed per second per molecule of rubisco at 25 o C

d.) Rubisco makes up almost 50% of soluble protein in chloroplasts and is probably one of the most abundant enzymes in the biosphere

Which of the following statements about rubisco will true?

TLS Online TPP Program

#Question id: 11916

#Unit 10. Ecological Principles

Which one of the following features of an later community?