Biological membranes are important in physiology, because

Describe the difference between differential versus selective medium.

Short Answer Set 2 SA 10. Define paracrine, endocrine, and synaptic signaling. SA 11. Identify one mechanism that generates or maintains the asymmetric distribution of plasma membrane proteins in polarized cells. SA 12. Identify the three types of cell-surface receptors responsible for converting an extracellular signal into an intracellular response. SA 13. Identify two examples of activated carriers and the specific group carried in a high-energy linkage. SA 14. For cells grown under anaerobic conditions, explain the importance of converting pyruvate to ethanol (in yeast) or lactic acid (in muscle cells). SA 15. Transmembrane proteins can cross the lipid bilayer by adopting one of two types of secondary structures. Identify the name given to each of these folds. SA16. Identify 2 differences in the post-transcriptional processing of rRNA and tRNA. SA17. Describe what is meant by the ‘wobble position’ in codon-anticodon pairing and identify one benefit that arises from this event. SA18. The tryptophan repressor is an ‘allosterically regulated’ protein. Define ‘allostery’ in this context. Identify the small molecule that regulates the tryptophan repressor and indicate how the repressor functions in the presence/absence of this small molecule. SA19. Identify one mechanism that ensures a differentiated cell retains its identity following cell division.

Based on structure shown in the image below, what type of pollination does this species (Echinacea purpurea) primarily rely on?

Which is the largest cell found in the human body?

Questions 87 to 102 come from material covered in BIO8053 (Comprehensive Study of Animals)

When we build trees using DNA sequence data, we are essentially recreating the ancestral sequence that gave rise to all DNA sequences in our dataset. What do we call this inferred ancestral genotype?

There are several key characters that distinguish modern humans from all our closest living relatives. Which of these key characters shows up first in the fossil record?

Below are 2 strands of DNA. The bottom strand is a template strand, and the top strand is a daughter strand being synthesized by DNA polymerase in the direction shown by the arrow. Which of the letters represent 3’ end of the DNA strands? 

Darwin gets a lot of credit for things he didn’t do. What are the two ideas that Darwin DID propose?