Which one of the following is the best explanation for why plants may use active rather than passive transport?
A. The phospholipid bilayer is not formed.
B. Protein channels are plugged.
C. Development of pores has not occurred.
D. Membrane potential is blocked.
E. Solute concentration is a factor.
E. Solute concentration is a factor.
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Which is a true statement regarding the size of PCR products?
A. Since the number of DNA products extends beyond each primer with each cycle, when PCR is completed, the majority of products are of various sizes. B. Since the number of DNA products ending exactly between both primers increases with each cycle, when PCR is completed, the majority of products are of similar size. C. Since the length of primers increases with each cycle, when PCR is completed, the majority of products are of various sizes. D. None of the choices are correct.
Which of the following is a region in DNA that binds to a steroid receptor?
A. GRE B. IRE C. CRE D. CREB
Which parts of the human eye are adjustablethat
is, they can be adjusted to accommodate light and/ or images?
a. the cornea b. the iris c. the lens d. the cornea and the lens e. the lens and the iris
Altogether, the body secretes about 7 liters of water into the alimentary canal each day. About what percentage of this water gets reabsorbed?
A) 30% B) 50% C) 60% D) 90%