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TLS Online TPP Program

#Question id: 4338

Altering patterns of gene expression in prokaryotes would most likely serve an organism's survival by __.

#Unit 3. Fundamental Processes

  1. organizing gene expression, so that genes are expressed in a given order

  2. allowing each gene to be expressed an equal number of times

  3. allowing an organism to adjust to changes in environmental conditions

  4. allowing environmental changes to alter a prokaryote's genome

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TLS Online TPP Program

#Question id: 8959

#Unit 9. Diversity of Life Forms

The most ancient branch point in animal phylogeny is that between having
TLS Online TPP Program

#Question id: 12498

#Unit 8. Inheritance Biology

In this pedigree II 1 is affected with an autosomal recessive disorder. The disease status for II 2 and II 3 is unknown. A and B represent alleles at a locus which is tightly linked to the disease locus with recombination fraction of 0. On the basis of the linked marker genotypes II 2 can be told that: 
TLS Online TPP Program

#Question id: 5674

#Unit 5. Developmental Biology

Following statements are regarding to the mechanism of migration of pollen tube.

A. The embryo sac is the product of three mitotic divisions of the diploid megaspore; it comprises seven cells and eight haploid nuclei.

B. The two polar nuclei in the central cell will fuse with the second sperm nucleus and produce the endosperm that will nourish the egg. The other six cells, including the egg, contain one haploid nucleus each.

C. After compatible pollen germinates, the pollen tube grows toward the micropyle.

D. The three cells from the pollen are connected to one another at the tip of the tube, and waves of sodium ions play a key role in the growth of the tube.

Which of the following combinations are correct?
TLS Online TPP Program

#Question id: 2299

#Unit 2. Cellular Organization

_______ are plastids containing carotenoid pigments, and _______ are plastids containing starches.
TLS Online TPP Program

#Question id: 23851

#Unit 13. Methods in Biology

DNA fragments from a gel are transferred to a nitrocellulose paper during the procedure called Southern blotting. What is the purpose of transferring the DNA from a gel to a nitrocellulose paper?