A single-gene disease that can cause symptoms in a fetus is
A) Huntington disease.
B) Alzheimer disease.
C) malaria.
D) osteogenesis imperfecta.
D) osteogenesis imperfecta.
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Which one of the following statements about homeotic, or Hox, genes is not correct?
A. Drosophila contain 8 Hox genes arranged in two clusters, the Antennapedia complex and the Bithorax complex. B. Hox genes are arranged in order according to their relationship with the anterior-posterior segmentation. C. Timing of expression corresponds to chromosomal order and location of expression. For example, anterior genes "turn on" earlier compared to those expressed in the posterior. D. The linear order of Hox genes along the chromosome, the anterior-posterior orientation of the embryo, and timing of expression for the genes in Hox clusters is observed only in Drosophila. E. Many of the genes in the mammalian Hox clusters have redundant or overlapping functions.
Of the following organisms, which one is among the Aggregatibacter aphrophilus, Aggregati-bacter actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella spp. (HACEK) group of organisms that cause slowly progressive bacterial endocarditis?
a. Capnocytophaga gingivalis b. Sphingomonas paucimobilis c. E. corrodens d. A. actinomycetemcomitans
A phospholipid has ______ fatty acids attached to glycerol, whereas a fat has _______.
A. 3; 4 B. 3; 2 C. 2; 3 D. 2; 4 E. 4; 2
Devise an example of a food chain with four links.
What will be an ideal response?