Active transport would be LEAST important in the normal functioning of which of the following plant tissue types?
A) leaf transfer cells
B) stem tracheids
C) root endodermal cells
D) leaf mesophyll cells
E) root sieve-tube elements
Answer: B
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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.
All of the following events occur during mitosis EXCEPT ____
a. alignment of chromosomes at the spindle midpoint b. disappearance of the nuclear envelope c. formation of the spindle d. DNA synthesis e. separation of sister chromatids
In humans, nitric oxide is an important gaseous neurotransmitter. Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS). What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?
A. He would be unable to produce all the liquid components of semen. B. He would have high levels of mutation within his mature sperm. C. He would have difficulty getting and/or sustaining an erection. D. He would have a low sperm count due to decreased spermatogenesis.
As an animal matures, it may form preferences or social attachments to other individuals. This is referred to as ________.
Fill in the blank(s) with the appropriate word(s).