What must occur before a newly made polypeptide is secreted from a cell?
A) It must be translated by a ribosome that remains free within the cytosol.
B) Its signal sequence must target it to the ER, after which it goes to the Golgi.
C) Its signal sequence must be cleaved off before the polypeptide can enter the ER.
D) Its signal sequence must target it to the plasma membrane, where it causes exocytosis.
B
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Influenza virus adheres to the epithelium of the respiratory system with the aid of ________ and ________ found in its envelope spikes.
What will be an ideal response?
__________ are living cells that do not conduct sugar themselves but play a crucial role in assisting
the movement of sugars. a. Sieve tube members b. Sieve plates c. Tracheids d. Vessel elements e. Companion cells
IS elements (insertion sequences) are stable DNA occupants of prokaryotic genomes that are not found among eukaryotes
Indicate whether the statement is true or false
If the parents of a child have the following genotypes [Bb ´ Bb], what is the probability that they will have a child with the genotype [BB]?
A. 100% B. 50% C. 25% D. 0%