Vitamin C deficiency may lead to scurvy, a disease characterized by skin lesions and blood vessel hemorrhages due to weakened connective tissue. Vitamin C deficiency has this effect because the vitamin is
a. a critical structural component of collagen.
b. required for the enzymatic activity of prolyl hydroxylase.
c. required for the enzymatic activity of cellulose synthase.
d. required for the enzymatic activity of hydroxyprolyl hydroxylase.
Ans: a. a critical structural component of collagen.
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Which of the following is a benefit of recombination during meiosis in eukaryotes?
A. Branched intermediates aid in segregation by keeping the homologous chromosomes together. B. Crossing over can result from recombination, decreasing the combinations of alleles in each meiotic product. C. Recombination introduces mutations that lead to increased variation in the population. D. Recombination does not occur during meiosis. E. None of the choices given is correct.
The part of the genome that encodes protein is called the
A) intron. B) exon. C) exome. D) prodrome.
The units of inheritance are
a. heredities. b. evolutions. c. twins. d. metabolic activities. e. genes.
Viruses have typical cellular structure like other living organisms.
Answer the following statement true (T) or false (F)