Your father is heterozygous for a recessive disorder. You know your mom has two "good" alleles
What is the probability that you will have the disorder?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
A
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Why does the presence of telomeres protect the ends of linear chromosomes?
A. Telomere DNA is resistant to nuclease activity. B. The telomeres represent large "buffer zones" of DNA sequence that do not code for biomolecules. Loss of these sequences is easily tolerated. C. Every time somatic cells replicate, telomerase extends the ends of the chromosomes. D. Specialized telomere-binding proteins prevent loss of DNA during replication. E. None of these choices is correct.
The ____ hypothesis states that mitochondria and chloroplasts evolved from bacteria
a. invagination b. exosymbiont c. membrane folding d. captured bacteria e. endosymbiont
Which feature is found in both nonvascular and vascular plants?
a. xylem b. cuticle c. apical meristem d. lignin
Cytotoxic T cells have the ability to
A. produce platelets. B. increase erythrocyte production. C. produce antibodies. D. stimulate thrombin. E. destroy pathogens.