Which is the correct pairing of nucleotides in DNA?
1.guanine - adenine, cytosine - thymine
2.thymine - guanine, cytosine - adenine
3.cytosine - thymine, guanine - adenine
4.guanine - cytosine, adenine - thymine
4
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A population of mosquitoes is exposed to the pesticide DDT for several generations. At the end of that time, most individuals in the population are resistant to DDT. The most likely reason is that:
A. DDT caused the mutations that lead to resistance. B. some individuals in the original population had the mutations that lead to resistance. C. by chance, new mutations that lead to DDT resistance arose after DDT was used. D. somatic mutations in the original population were passed on to subsequent generations. E. random mutations in each generation made mosquitoes resistant to DDT.
Type II interferon inhibits viral replication and activates natural killer cells. Indicate whether the statement is true or false
When contracted, ________ prevents movement of chyme from the stomach to the small intestine
A) peristalsis
B) reverse peristalsis
C) the epiglottis
D) a sphincter
The complement components react ______.
A. in a cascade B. in parallel C. differently at different temperatures D. simultaneously