The two strands of DNA are held together by:
What will be an ideal response?
hydrogen bonding
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EGF (epidermal growth factor) activates cell division by binding ________.
Fill in the blank(s) with the appropriate word(s).
Which statement best describes a typical food chain?
a. An owl has a positive impact on the grass population. b. An owl has a negative impact on the grass population. c. A carnivore has a negative effect on primary producers. d. Energy can flow back and forth between trophic levels. e. Energy is never lost as it moves from one trophic level to the next.
Which of the following DNA sequences is complementary to 5' ATGGTCAGT 3'?
A. 5' TACCAGTCA 3' B. 5' TGACTGGTA 3' C. 5' ATGGTCAGT 3' D. 5' ACTGACCAT 3'
Tetanus vaccine contains
A) antibodies against Clostridium tetani. B) inactivated Clostridium tetani endospores. C) antibodies against Clostridium tetani endospores. D) fragments of Clostridium tetani cell walls. E) inactivated tetanospasmin.