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TLS Online TPP Program

#Question id: 23874

Scientists developed a set of guidelines to address the safety of DNA technology. Which of the following is one of the adopted safety measures?

#Unit 13. Methods in Biology
  1. Microorganisms used in recombinant DNA experiments are genetically crippled to ensure that they cannot survive outside of the laboratory.
  2. Genetically modified organisms are not allowed to be part of our food supply.
  3. Transgenic plants are engineered so that the plant genes cannot hybridize.
  4. Experiments involving HIV or other potentially dangerous viruses have been banned.
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TLS Online TPP Program

#Question id: 5647

#Unit 5. Developmental Biology

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein

that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1) from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. Treatments:

A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads

B: S. purpuratus sperm mixed with beads containing no ERB1 protein

C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads

D: S. franciscanus sperm mixed with beads containing no ERB1 protein

Based on the data in the graph, which of the following conclusions is supported?
TLS Online TPP Program

#Question id: 2096

#Unit 2. Cellular Organization

Movement of phospholipids from one leaflet to the other
TLS Online TPP Program

#Question id: 28523

#Unit 5. Developmental Biology

Which of the following stage of plant development giving the embryo bilateral symmetry?
TLS Online TPP Program

#Question id: 23632

#Unit 13. Methods in Biology

Which formula may be implemented to determine the probability (P) that a library of a given size contains a particular clone? (N is the number of recombinant clones in the library; n is the frequency of occurrence of a desired clone)
TLS Online TPP Program

#Question id: 17269

#Unit 8. Inheritance Biology

In humans, albinism (unpigmented skin, hair, and eyes) is due to an enzymatic deficiency, and it is an autosomal recessive trait. Suppose that in a small country of one million people (“Generation 1”), there are 500 aa albinos and 9000 Aa heterozygous carriers. In the next generation of 1 million individuals (Generation 2), what are the expected numbers of aa albinos and Aa carriers? (Assume random mating and all other HardyWeinberg conditions.)