Signal molecules that determine relative positions during development are known as
A. morphogens.
B. organizers.
C. inductors.
D. cadherin domains.
E. derepressers.
Answer: A
You might also like to view...
The genes encoding luciferase, green fluorescent protein (GFP), and ?-galactosidase are typically used in cloning as
A) transcription regulators. B) global control genes. C) promoter sequences. D) reporter genes.
Which of the following two lineages are thought to have evolved from a protist ancestor?
A. Bacteria and plants B. Plants and fungi C. Fungi and animals D. Plants and animals
To detect whether or not a cell has a specific region of a gene, researchers add radioactively labeled DNA molecules that can bind to their complementary DNA sequences. To detect a mutant version of the BLM gene, researchers added the radioactive DNA
molecule 5' - GCTAGCTAAGCCCA - 3' to cells. What DNA sequence were the researchers trying to detect? A) 5? - GCTAGCTAAGCCCA - 3' B) 3? - GCTAGCTAAGCCCA - 5' C) 5? - CGATCGATTCGGGT - 3' D) 3? - CGATCGATTCGGGT - 5'
Choose the answer that best fits the following statement: Cholesterol is an essential component of biological membranes
Although it is much smaller than the typical phospholipids and glycolipids in the membrane, it is a(n) _________________ molecule, having both hydrophilic and hydrophobic regions. (a) polar (b) oxygen-containing (c) hydrophobic (d) amphipathic