In the Arabidopsis cdka;1 mutant the central cell of the female gametophyte is not fertilized. What structure will not form in these mutant plants?
A. endosperm
B. pollen tube
C. synergids
D. egg cell
Answer: A
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Answer the following statements true (T) or false (F)
1. Overall brain size across mammals (e.g., an elephant vs. a bat) is a good predictor of behavioral complexity. 2. Cranial nerves are connected directly to the brain. 3. The somatic nervous system primarily regulates involuntary responses. 4. The sympathetic and parasympathetic divisions of the autonomic nervous system tend to have opposing actions on target organs.
One of the earliest antimicrobials isolated from a bacterium was
A. penicillin. B. ampicillin. C. Salvarsan. D. streptomycin.
Who am I? I have the same photosynthetic pigments as plants, but I can also obtain nutrients by
ingestion. a. plasmodium b. Amoeba c. euglenoids d. Giardia e. Paramecium
Support for the succession mechanism of tolerance is found in research on plant communities that shows
A. that plants release toxins that prevent other species from establishing. B. competition-tolerant species colonize first. C. climax communities rarely form. D. succession is determined largely by species that exist in the ground as seeds or old roots. E. succession is random and cannot be predicted by existing species.