Which of the following is not a structural motif associated with transcriptional regulation?
A) combinatorial model
B) helix-turn-helix
C) zinc finger
D) leucine zipper
E) helix-loop-helix
A) combinatorial model
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Females outnumber males in the tertiary sex ratio because genetic and ____________________ factors cause higher death rates among males
Fill in the blank(s) with correct word
What is the great risk of warming to tropical marine species?
A) reduced growing season B) reduced water availability C) less variable precipitation D) Most species live near their thermal maximum.
The following sequence of organisms represents all of the following except trees ® insects ® spiders ® frogs ® fish ® human
A. a food chain.
B. a food web.
C. the flow of energy through the community.
D. the flow of nutrients through the community.
Which of the following cell types produce antibodies?
a) t- cells b) dendritic cells c) b- cells d) natural killer cells