Enhancers are the binding sites for the
A. promoters of DNA synthesis.
B. suppressor factors.
C. co-activation factors.
D. mediator factors.
E. specific transcription factors.
E. specific transcription factors.
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Which of the following cell types are specifically part of the adaptive immune system? Select all correct choices
A. eosinophils B. plasma cells C. mast cells D. dendritic cells E. helper T cells
The appendix is a vestigial structure in humans
Indicate whether the statement is true or false.
Which strains' mutations represent a complementation group?
Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-H). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible that all seven strains have mutations in the same gene. Alternatively, some or all of the strains may have mutations in different genes. To determine how many genes are involved in eye color in these flies, all possible pairwise crosses are performed. The offspring phenotypes resulting from each cross are observed. (+ = wild-type; ? = mutant)
A) C, D, F
B) A, B
C) E
D) A, B, E, G, H
Is the regulation of blood sugar levels in the body a negative feedback loop or a positive feedback loop?
A. negative feedback loop B. positive feedback loop