The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. Autocrine
B. Direct contact
C. Synaptic
D. Paracrine
E. Endocrine
Answer: A
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Homo sapiens is the name of a species. Homo is the name of a genus. Hominidae is the name of a __________. Primate is the name of an order. Mammal is the name of a class. Animal is the name of a kingdom. Eukaryote is the name of a domain.
a) family b) genera c) genome d) subspecies e) variety
Consider the events that describe the progress of a protein that will be secreted from the cell.
1. SRP binds to the growing polypeptide chain and to the ribosome. 2. Translation resumes. 3. SRP binds to its receptor. 4. The signal sequence is cleaved. 5. Protein synthesis begins in the cytosol. 6. Translation pauses. Which of the sequences of events correctly describes the progress of a protein that will be secreted from the cell? A) 5 ? 1 ? 6 ? 3 ? 2 ? 4 B) 5 ? 6 ? 1 ? 3 ? 2 ? 4 C) 3 ? 6 ? 1 ? 2 ? 4 ? 5
What is the function of the E. coli proteins MreB, PBP2, and RodA?
What will be an ideal response?
Acute inflammation is normally beneficial.
Answer the following statement true (T) or false (F)