#Question id: 18077
#Unit 7. System Physiology – Animal
#Question id: 8288
#Unit 9. Diversity of Life Forms
Some beetles and flies have antler-like structures on their heads, much like male deer. The existence of antlers in beetle, fly, and deer species with strong male-male competition is an example of ________.
#Question id: 1364
#Unit 4. Cell Communication and Cell Signaling
In mice engineered to overexpress the syndecan-1 gene in the hypothalamic region of the brain and other tissues, normal control of feeding by antisatiety peptides is disrupted, and the animals overeat and become obese. Other studies have shown that syndecan-3 may also be involved in the regulation of feeding behavior. Given the following information, which of these outcomes might you expect in experimentally manipulated mice?
I. Hypothalmic expression of syndecan-3 is increased by fasting.
II. Syndecan-3 knockout mice are resistant to diet-induced obesity.
III. Heparinase can cleave syndecan-3 to release heparin sulfate GAG chains that may suppress the activity of antisatiety peptides and feeding behavior.
Following statements are:
A. Overexpression of heparinase in mice with normal levels of syndecan-3 would result in resistance to diet-induced obesity.
B. In mice with normal levels of syndecan-3, fasting followed by free access to a high-fat diet would lead to resistance to diet-induced obesity.
C. Lack of heparinase in mice with normal levels of syndecan-3 would result in animals that overeat and become obese.
D. Overexpression of heparinase in syndecan-3 knockout mice would reverse the resistance to diet-induced obesity.
Which of the following combination is correct?
#Question id: 851
#Unit 1. Molecules and their Interaction Relevant to Biology
Methods is the Rosetta program, formulated by David Baker. To satisfy the program’s computational needs, a volunteer network of ∼100,000 computers, known as Rosetta@home, provides the 500,000 or so hours of processing time required to generate a structure;
#Question id: 5778
#Unit 8. Inheritance Biology
DNA is repaired by ____ in which a pyrimidine dimer is split