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TLS Online TPP Program

#Question id: 2220

Cell membranes have distinct inside and outside faces. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature?

#Unit 2. Cellular Organization

  1. Since the cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium, the membrane must be asymmetrical.

  2. Since cell membranes communicate signals from one organism to another, the cell membranes must be asymmetrical.

  3. The two sides of a cell membrane face different environments and carry out different functions.

  4. Proteins only function on the cytoplasmic side of the cell membrane, which results in the membrane's asymmetrical nature.

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TLS Online TPP Program

#Question id: 3036

#Unit 2. Cellular Organization

During which phase would penicillin, an antibiotic that inhibits cell-wall synthesis, be most effective?
TLS Online TPP Program

#Question id: 31290

#Unit 5. Developmental Biology

In drosophila, When the Ultrabithorax gene is deleted, resulting;
TLS Online TPP Program

#Question id: 10682

#Unit 10. Ecological Principles

if 30 individuals of species 2 take up the same amount of resources as 5 individual of species 1 then the per capita competitive effects on species 1 of species 2 is
TLS Online TPP Program

#Question id: 16139

#Unit 13. Methods in Biology

 Many mouse genes are “tissue-specific,” that is, they are present throughout the body but are expressed in only one of the animal’s many tissue types. (Other mouse genes are expressed throughout the body, or in multiple tissues.) Geneticists can study the regulation of a mouse gene by fusing the gene’s promoter region to the LacZ coding sequence and injecting the construct to create a transgenic mouse. Fusion of the mouse amylase promoter to LacZ yielded a Pamylase-LacZ construct.              
Mice heterozygous for the resulting Pamylase-LacZ  transgene displayed the LacZ expression exclusively in the pancreas. Would you expect homozygotes for the transgene to also display LacZ expression in the pancreas?.
TLS Online TPP Program

#Question id: 32347

#Unit 1. Molecules and their Interaction Relevant to Biology

Cytosolic normal p53 directly inhibits