Which of these is true for most water-soluble
hormones?
a. They must be transported by specific carriers in
the blood.
b. They have no trouble entering their target cells.
c. They find and react with surface receptor
molecules.
d. They never elicit the production of a second
messenger.
e. They trigger gene transcription.
Answer: c
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All of the following statements about cellular trafficking are true except
A) COPII-coated vesicles move materials from ER to Golgi. B) COPI-coated vesicles move materials from Golgi to the secretory vesicle. C) movement may be mediated by microtubules. D) v-SNAREs occur in vesicles; t-SNAREs occur on target sites. E) tethering proteins mediate docking between target and vesicle.
If an organism inherits two recessive alleles, the phenotype of this organism will look like which of the following?
a. the dominant allele b. the recessive allele c. both the dominant and recessive allele d. neither the dominant or recessive allele
All male honeybees develop from unfertilized eggs. This is an example of
A) parthenogenesis. B) sexual reproduction. C) budding. D) hermaphrodism. E) external fertilization.
The figure below shows the per capita mortality rates for three different vertebrate species. How would the graphs look like in the absence of senescence?
The human females are represented by the lowest line on the graph, the chimpanzee females are represented by the middle line on the graph, and the Harbor porpoise is represented by the top line on the graph. a. They would rise linearly with age. b. They would be parallel to the x-axis. c. They would continue to show elevated rates at an early age, but then bottom out and parallel the x-axis. d. This cannot be confidently determined as the mortality rate mirrors both extrinsic mortality and senescence.