Vestimentiferan worms lack digestive tissues
Indicate whether the statement is true or false
T
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It is estimated that humans can produce over 1.5 million different types of antibodies. Which of the following statements regarding this extraordinary variation is INCORRECT?
A. We inherit over 1.5 million different and distinct immunoglobulin genes from our parents at fertilization. B. V and J domains of antibody light chains are randomly joined. C. Random segments of DNA can be removed from antibody genes. D. V and J domains of antibody heavy chains are randomly joined. E. Cytosines in the variable regions of antibody genes can be converted to uracils via hypermutation.
DNA methylation of a gene during spermatogenesis would be most likely to result in
A. the inactivation of the paternal allele in the offspring. B. dosage compensation by the paternal allele. C. the inactivation of the maternal allele in the offspring. D. the inactivation of the X chromosome. E. dosage compensation by the maternal allele.
Based on your knowledge of the distribution of CO2 in the marine environment and the pattern of pressure with depth, explain why calcium carbonate deposits of coccolithophores and foraminiferans are not found below 5000 m
What will be an ideal response?
A mass extinction, in which the dinosaurs disappeared from Earth, occurred approximately ____ years ago
a. 6500 b. 65,000 c. 650,000
d. 65,000,000 e. 650,000,000