Sheldon was trying to figure out how to “train” his roommate’s girlfriend and stop her bad habits.  He hypothesized that if he gave Penny (the girlfriend) chocolate every time she was “behaving correctly”, the bad habits would disappear.  After several sessions of this chocolate reward training, Leonard (the roommate) caught on to what Sheldon was doing.  He said that he needed to stop trying to train Penny. What is the independent variable in this experiment?

A distinct piece of DNA that encodes for a protein

Which number represents the constant region of the heavy chain of an antibody?

Upon extracellular ligand binding, receptor tyrosine kinases:

The homeodomain of transcriptional regulators bind to the ___ groove of a DNA regulatory sequence through ___ bonding

The synthesis of RNA begins here

Which domain(s) of life contain single-celled organisms? (Check all that apply)

Given the sequence of one strand of a DNA molecule (below), provide the sequence of the complementary strand.   5’ ATGCCTGAGAT 3’

The sequence of template strand of DNA is 5′ GCATCC 3′ what is the sequence of the RNA transcript that is produced?

After transport to the plasma membrane, the membrane glycoprotein below would be present in the cytoplasm.