A fisheries biologist tells you she is studying a cohort of salmon returning to their birth river. What can you infer about those salmon?
A. They are iteroparous.
B. Most of them are one to three years old.
C. They are the same age.
D. They have a uniform distribution.
E. They have a Type II survivorship curve.
C. They are the same age.
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Examine the figure and statements below. Which one of the statements is incorrect?
A. mRNA for caudal and hunchback are evenly distributed in the oocyte, but bicoid and nanos mRNA are located either anteriorly or posteriorly, respectively. B. Bicoid protein promotes the transcription of the hunchback gene in the anterior region of the embryo. C. Nanos protein represses the translation of hunchback mRNA in the posterior region of the embryo. D. Bicoid protein represses the translation of caudal mRNA in the anterior region of the embryo. E. The expression pattern of Caudal and Hunchback proteins is an example of gene regulation at the level of translation.
How would cellulose-degrading bacteria in the rumen (stomachs) of a cow benefit the animal?
A. The bacteria would produce, secrete, and incorporate organic molecules as they obtain energy from the cellulose in grass and replicate. The cow could then digest both the secreted organic molecules AND the bacteria that synthesized them. B. The bacteria would produce sugars as they digested the cellulose. These sugars would be given off to the cow as a symbiotic relationship in exchange for the protected location of the stomachs of the cow for the bacteria to grow and replicate in. C. They wouldn't benefit the animal-they would replicate and cause disease in the animal, leading to its death. D. They wouldn't benefit the animal-only the bacteria within the animal. This is why cows must have food sources other than grass in order to survive.
Which is the hormone that stimulates growth by increasing cell size or rate of cell division?
A) calcitonin B) growth hormone C) oxytocin D) tropic hormone
Disease-causing bacteria are called
A) pathogens. B) cyanobacteria. C) viroids. D) archaea. E) protozoa.