Which type of plant hormone is primarily responsible for inhibiting leaf abscission?
a. gibberellins
b. ethylene
c. jasmonates
d. abscisic acid
e. auxins
E
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Using polyethylene glycol, a cancer cell and a normal cell are fused. The resulting hybrid behaves like a normal cell. The best reason for this observation is the
A) recombination between cancer and normal chromosomes. B) removal of environmental triggers. C) presence of tumor suppressor genes and gene products. D) exposure to polyethylene glycol. E) both choices A and C
Heterospory refers to having ____
a. both male and female gametes b. two types of spores in two different types of sporangia c. both male and female parts on the same plant d. separate male and female plants e. both sporophyte and gametophyte generations
A patient, complaining about persistent drowsiness and difficulty conceiving children undergoes a series of tests, during which it is shown that he has a significantly diminished sperm count. Excess production of which hormone could account for these symptoms?
a. luteinizing hormone b. testosterone c. melatonin d. cortisol
The first peptide hormone discovered in plants was ____, which functions in wound response in the
tomato.
a. cytokinin b. systemin c. gibberellin d. jasmonate e. salicylic acid