Which describes a promoter?
A .the first part of an operon that regulates where, when, and to what level a gene is expressed
B. the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene
C .a cluster of genes that are expressed or repressed as a group
D .an enzyme that helps DNA unzip prior to transcription

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

Me brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula.5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects.8. describe the planets’ orbits around the sun.9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets.13. what causes the seasons?

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?