In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males. Why do you think sperm are necessary for reproduction?

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#Question id: 1087

#SCPH01 Biochemistry

Scientists have found that extracellular matrix components may induce specific gene expression in embryonic tissues such as the liver and testes. For this to happen, there must be direct communication between the extracellular matrix and the developing cells. Which kind of transmembrane protein would most likely be involved in this kind of induction?

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#Question id: 346

#SCPH05 I Biotechnology

The partial negative charge in a molecule of water occurs because ________.

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#Question id: 15478

#SCPH01 Biochemistry

Escherichia coli preferentially utilizes glucose by preventing the uptake of lactose and switching off transcription of the lac operon. This mechanism is known as 

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#Question id: 14350

#SCPH05 I Biotechnology

Henry's law relates 

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#Question id: 11067

#I Life Science/ Life Sciences Group – I-V

A preterm infant has a surfactant deficiency. Without surfactant, many of the alveoli collapse at the end of each expiration, which in turn leads to pulmonary failure. Which of the following sets of changes are present in the preterm infant, compared to a normal infant?