Which organisms should be used to run quality control for acid-fast stains?
a. Nocardia and Rhodococcus
b. Streptomyces and Actinomadura
c. Dermatophilus and Nocardiopsis
d. Nocardia and Streptomyces
D
The only organisms that are partially acid-fast positive and acid-fast negative are Nocardia and Streptomyces, respectively. All other combinations are either both acid-fast positive (Nocardia and Rhodococcus) or both acid-fast negative (Streptomyces and Actinomadura; Dermatophilus and Nocardiopsis).
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In Arabidopsis the gene TRIPTYCHON is involved in determining ____
a. how closely trichomes will develop to each other b. whether or not trichomes are formed c. which side of a leaf will have trichomes d. the number of branches of a trichome e. cell division within trichomes
If you were measuring hormones in the blood of a patient who was ovulating, you would expect a large increase in which hormone, reaching maximal level on the day of ovulation?
A. follicle-stimulating hormone (FSH) B. luteinizing hormone (LH) C. estrogen D. progesterone E. gonadotropin-releasing hormone (GnRH)
In the evolution of the arboreal primates, which of the following features would NOT be an important
evolutionary advancement? a. opposable thumbs b. enhanced daytime vision c. elongated snout with well-developed sense of smell d. the ability to see in color e. a brain with a well-developed ability to judge distances and with the ability to quickly compensate for misjudgments
Which stage of the life cycle shown is the sporophyte?
A) stage A
B) stage B
C) stage C
D) stage D