The release of DDT into the environment to control some insect pests will result in the highest
detectable concentrations
a. at the bottom of the food chain.
b. in the targeted insect pest.
c. in the middle of the food chain.
d. at the end of the food chain.
e. nowhere, because DDT is degraded rapidly.
D
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A snake warming itself on a rock is an example of heat transfer by ________
a. thermal radiation b. convection c. evaporation d. conduction
Why do the veins of the legs require valves in order to function?
What will be an ideal response?
Why do chromosomes resemble the letter X when viewed during metaphase?
A) Because they all appear and function as X chromosomes at that stage. B) Because there are two sister chromatids joined at a point in the middle (the centromere). C) Because microtubules encircle and attach pairs of chromosomes to each other at the centromere. D) Because each X-shaped structure is actually four chromosomes joined at the centromere.
If one reproductive strategy of a eukaryotic organism is gamete fusion, what can be concluded about that organism?
A. The organism participates in horizontal gene transfer. B. Progeny organisms are identical to each other. C. The organism participates in vertical gene transfer. D. The organism reproduces asexually.