Ian and Bryony are both carriers for two autosomal recessive disorders, PKU (chromosome 12) and cystic fibrosis (chromosome 7). They are expecting a daughter. What is the probability that she will have PKU but not CF?
A) 9/16
B) 3/16
C) 1/2
D) 1/16
B) 3/16
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Bone mass increases in humans until about age
__________ because __________ after that time. a. 18; osteoclast activity commences b. 13; osteoblast activity slows c. 24; osteoblast activity slows d. 24; osteocytes no longer function e. 18; osteocytes are no longer formed
________ is considered the first messenger, while ________ is called the second messenger.
A. Peptide hormone; cAMP B. Insulin; glucagon C. ACTH; cortisol D. TSH; thyroxin E. Glucose; insulin
Suppose that during the embryonic development of a hand, homeotic gene expression is altered such that the dorsal-ventral axis is switched. What is the most likely outcome of this scenario?
A) The palm and back of the hand will be switched. B) The pinky and thumb would be switched. C) The shoulder and hand would be switched. D) The foot and hand would be switched.
A newly described bacterial species has been shown to use CO2 as its carbon source. Its energy source and its source of reducing power (electrons) are inorganic chemicals. Which term would best describe this nutritional type?
A. Chemolithoautotroph B. Photoorganoheterotroph C. Chemolithoheterotroph D. Photolithoheterotroph