In a deoxyribonucleotide, what chemical group is found at the 2' carbon of the sugar component?
A. an oxygen
B. a hydroxyl group
C. one or more phosphate groups
D. an amino group
E. a hydrogen
Answer: E
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You discover a gene that results in a complete lack of hair in rats, and you name the gene "chromedome." A cross of homozygous normal and homozygous bald rats results in all bald rats. You conclude that the baldness allele is dominant, but when you repeat the cross with different rats none of the offspring are bald. Extremely puzzled you study your records and discover that in the first cross the bald rat was female, while in the second cross the bald rat was male. A. Chromedome is imprinted in females. B. Chromedome is imprinted in males. C. Chromedome is dominant in males and recessive in females. D. Chromedome is dominant in males and recessive in females. E. Chromedome is an X-linked gene.
Mendel called physical units responsible for the inheritance of traits "elementen." The basis for his first law is that elementen
A) separate from each other as gametes form. B) can exist as multiple alleles. C) are inherited in random combinations. D) can be cloned using nuclear transfer.
Which of the following viruses are the only ssDNA viruses that cause disease in humans?
A) Parvoviridae B) Hepadnaviridae C) Poxviridae D) Polyomaviridae E) Herpesviridae