What regulates the rate of production of cellular proteins within each cell?
A) redundancy in the genetic code
B) frameshift mutations
C) gene expression
D) ambiguity in the genetic code
C
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Arrange in the correct sequence these components of the mammalian immune system as it first responds to a pathogen
I) Pathogen is destroyed. II) Lymphocytes secrete antibodies. III) Antigenic determinants from pathogen bind to antigen receptors on lymphocytes. IV) Lymphocytes specific to antigenic determinants from pathogen become numerous. V) Only memory cells remain. A) I ? III ? II ? IV ? V B) III ? II ? I ? V ? IV C) II ? I ? IV ? III ? V D) IV ? II ? III ? I ? V E) III ? IV ? II ? I ? V
Phospholipase is an enzyme that will cleave the phosphate head group off a phospholipid molecule. The plasma membrane is not, however, permeable to the enzyme
Imagine a cell containing different phospholipids. How could you use phospholipase to determine which phospholipids are in the monolayer facing the exterior of the cell, and which are in the monolayer facing the interior (assume you have a way to assay for the different types of phospholipids)? What will be an ideal response?
What hypothesis suggests there is no competition between reef fish because there are so many factors to create a niche for each species?
a. Predation disturbance model b. Lottery model c. Competition model d. Resource limitation model
Horsetail and ferns are _____ plants
a. multicelled aquatic c. seedless vascular b. nonvascular seed d. seed-bearing vascular