Fill in the blank: transcription factors (proteins) our cells to promote gene expression (e. g., the production of insulin) by binding directly to dna and by assisting to initiate transcription.
a. actin monomers
b. tight junctions
c. rna polymerases
d. muscle fibrils

Apair of fruit flies reproduces and has 1,000 offspring. all 1,000 of the offspring have the alleles gg. what is the most likely combination of alleles for each parent

Fill in the blank 1. digestion occurs in the small intestine through the action of enzymes. 2. urea, excess water, and other waste materials are eliminated in a water fluid called 3. can cause infections by injecting dna or rna into hosts. 4. the human immune system produces in response to a vaccine, which later can bind to and destroy a pathogen if it invades. 5. are structures that link bone to bone at a joint 6. in the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the the words i can use are: lymphocytes gliding pivot gas urine absorption dermis fulcrum lungs chemical viruses capillary vertebrae esophagus tendons antibodies synapses ligaments kidneys pathogens

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?