What is BAT and what role does it play in animal physiology?
What will be an ideal response?
Answer: BAT is brown adipose tissue found along the back and shoulder regions of small mammals. BAT plays an important role in thermogenesis, because it generates heat in newborn mammals and small mammals that live in cold environments. BAT heat is referred to as nonshivering thermogenesis and a key feature of BAT is the protein thermogenin. In the mitochondrial membrane, thermogenin stimulates the rate of mitochondrial respiration and heat production. Normally, mitochondria produce ATP, but thermogenin uncouples mitochondria, dissipating the proton gradient so ATP cannot be produced, but instead heat is generated.
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A double-stranded chromosome consists of two genetically identical sister chromatids. What important biological event produced the sister chromatids?
A. Crossing over B. Reduction division C. Mitosis D. Genetic mutation E. DNA replication
Define total mixed ration (TMR)
What will be an ideal response?
Which of the following is a receptor that may be either excited or inhibited by acetylcholine?
A. Beta-adrenergic receptor B. Nicotinic receptor C. Muscarinic receptor D. Enteric receptor E. Alpha-adrenergic receptor
Why are polar bodies produced during oogenesis?
A. To lessen the amount of estrogen that is produced during the ovarian cycle B. To discard excess cytoplasm C. To hasten ovulation D. To increase the chances of sperm penetration E. To discard excess chromosomes