Based on the data in the table, this population has a ________ growth pattern
Time
(years) Number of
Organisms
1998 10
2000 15
2002 20
2004 40
2006 80
A) scramble competition
B) S-curve
C) J-curve
D) boom-and-bust
E) replacement-level fertility
C
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The regulation of blood sugar levels and our stress responses are controlled in part by a negative feedback loop involving cortisol, adrenocorticotropic hormone (ACTH), and corticotropin-releasing hormone (CRH)
What would likely be the result during times of stress if cortisol receptors in the hypothalamus were nonfunctional? A) Blood sugar levels would rise to dangerous levels. B) Blood sugar levels would be unaffected. C) ACTH production would cease. D) CRH production would cease. E) Cortisol production would cease.
You begin an experiment with two populations of E. coli that are each composed of 100 cells. The cells are all genetically identical (i.e., they are clones)
You grow these populations in flasks on a lab bench under identical conditions with unlimited resources. Which of the following statements about the populations are true? ____ Natural selection begins operating immediately on the populations. ____ Initial differences in population will be adaptations to the new environment. ____ Initial differences in the population will be the result of sexual selection. ____ Initially mutation will be the only source of variation in the population. ____ Initially these populations will be in H-W equilibrium. ____ Speciation cannot occur because the two populations are identical. ____ After 100 generations both populations will still be genetically the same, having accumulated the same mutations over time. ____ Natural selection cannot occur because bacteria are haploid, so there is no individual variation. ____ Speciation can only occur after there is enough variation in the population for natural selection to act upon. ____ Speciation can occur between these populations through genetic drift alone. What will be an ideal response?
In eukaryotic organisms, the processing of the 45S rRNA into 5.8S, 18S, and 28S rRNA occurs where?
A. In the cytoplasm B. In the nucleolus C. In the endoplasmic reticulum D. In the Golgi body E. Throughout the cell
Arthropods are
a. Carnivorous b. Herbivorous c. Omnivorous d. All of the choices are correct e. Choices A and B are correct