Small changes in influenza surface antigens lead to
A. antigenic drift.
B. antigenic shift.
C. antigenic recombination.
D. antigenic schism.
A. antigenic drift.
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One of the roles of histone proteins in eukaryotes is ___________
a) control of gene expression by preventing digestive enzymes from degrading the DNA. b) control of gene expression by allowing transcriptional enzymes variable access to the DNA. c) keeping sister chromatids together until they should separate during cell division. d) allowing microtubules to attach to the kinetochores.
The aspect of conservation ecology concerned with returning degraded ecosystems (as nearly as possible) to their natural state is
A) bioremediation. B) sustainable development. C) restoration ecology. D) landscape ecology.
Which of the following is the site where sperm are stored in the scrotum?
a) ureter b) urethra c) vas deferens d) epididymis
Desiccation is a reliable form of sterilization
Indicate whether the statement is true or false