Feedback repression involves the turning “off” of enzyme synthesis when the amount of the product has been made in sufficient quantities. The end product of the pathway acts as

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#Question id: 2283

#SCPH05 I Biotechnology

Most cells are very small. A typical eukaryotic cell, both plant and animal, will occur in which of the following size ranges?

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#Question id: 107

#SCPH01 Biochemistry

Ethanolamine, serine and choline can be cleaved from glycerophospholipids by treatment with

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#Question id: 1123

#SCPH28 | Zoology

Epinephrine can be what kind of signaling molecule?

a. autocrine      b. direct contact  c. endocrine d. paracrine

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#Question id: 7763

#SCPH28 | Zoology

Two major sources of mutation are radiation and reactive oxygen species (ROS).The reactive oxygen species hypothesis for aging postulates that 

1) Senescence results from the accumulation of DNA, lipid, and protein damage inflicted by ROS of mitochondrial origin; and

2) Mitochondria of long-lived species should produce high ROS than do mitochondria of short-lived species.

3) the capacity of mitochondria to consume ROS might distinguish long-lived species from short-lived species, rather than differences in ROS generation. 

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#Question id: 3278

#SCPH06 I Botany

What does the biological species concept use as the primary criterion for determining species boundaries?