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#Question id: 18872


Which of the following statements is true of archegonia? 

#Unit 9. Diversity of Life Forms
  1. They are the sites where male gametes are produced
  2. They may temporarily contain sporophyte embryos 
  3. They are the same as sporangia 
  4. They are the ancestral versions of animal gonads
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TLS Online TPP Program

#Question id: 4621

#Unit 11. Evolution and Behavior

DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that

TLS Online TPP Program

#Question id: 3526

#Unit 8. Inheritance Biology

In garden peas, the allele for tall plants (D) is completely dominant to the allele for dwarf plants (d) and the allele for violet flower color (W) is completely dominant to the allele for white flower color (w). In a cross between a tall violet plant, with the genotype DDWw, and a dwarf white plant, what phenotypic ratio of the progeny would be expected from this cross?

TLS Online TPP Program

#Question id: 6979

#Unit 5. Developmental Biology

The muscle-forming cells of the vertebrate limb come from:

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#Question id: 13052

#Unit 13. Methods in Biology

What would be the effect on the PCR reaction if any of the following circumstances arose: 1) there are no primers in the reaction, 2) there are no dNTPs in the reaction, 3) there is no Taq polymerase in the reaction?

TLS Online TPP Program

#Question id: 889

#Unit 1. Molecules and their Interaction Relevant to Biology

The cis and trans GroEL rings undergo conformational changes in a reciprocating fashion, with events in one ring influencing events in the other ring. The entire GroEL/ES chaperonin complex functions as follows;

a) One GroEL ring that has bound 7 ATP also binds an improperly folded substrate protein, which associates with hydrophobic patches that line the inner wall of the GroEL chamber

b) The GroES cap then binds to the GroEL ring like a lid on a pot, inducing a conformational change in the resulting cis ring

c) Within ~10 s the cis ring catalyzes the hydrolysis of its 7 bound ATPs and releases the resulting Pi , which weakens the interactions binding GroES to GroEL

d) A second molecule of improperly folded substrate protein binds to the cis ring, followed by 7 ATP

e) The binding of substrate protein and ATP to the cis ring conformationally induces the trans ring to release its bound GroES, 7 ADP, and the presumably now better-folded substrate protein

Which of the following is incorrect functions of GroEL/ES chaperonin complex?