Which of the following is NOT a general feature of active transport?
A. All of the above are characteristics of active transport
B. Requires a carrier protein
C. Can move molecules against a concentration gradient
D. Requires a form of energy
Ans: A. All of the above are characteristics of active transport
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Many scientists believe that the evolution of multigene families, such as the genes for hemoglobin, is a result of which type of genetic rearrangement?
A) Duplication B) Deletion C) Inversion D) Reciprocal translocation E) Nonreciprocal translocation
Many proteins can be made from a single mRNA. Why then do cells transcribe many copies of the same mRNA?
What will be an ideal response?
Which of the following can serve as channels or pumps within the cell membrane?
a. integral proteins b. glycoproteins c. cholesterol d. phospholipids
A plant systematist aims to
a. identify and name plant species. b. classify plant species within larger groups. c. understand the evolutionary history and relationships of plant species. d. Identify and name plant species, and classify plant species within larger groups e. Identify and name plant species, classify plant species within larger groups and understand the evolutionary history and relationships of plant species.