Ammonia is likely to be the primary nitrogenous waste in living conditions that include _____
A) lots of fresh water flowing across the gills of a fish
B) lots of seawater, such as a bird living in a marine environment
C) lots of seawater, such as a marine mammal (for example, a polar bear)
D) a terrestrial environment, such as that supporting crickets
E) a moist system of burrows, such as those of naked mole rats
Answer: A
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Gene flow, defined as the movement of genes from one population to another, can take place by migration, as well as
A. physical movement of genes within an individual by transposons. B. removing the barriers between the populations. C. mating between individuals of adjacent populations. D. mating with certain trait-containing individuals. E. mating with dominant phenotypes.
In Arabidopsis, the floral meristem is organized into four concentric whorls of cells, each of which gives rise to a specific organ of the mature flower. The floral meristem is therefore analogous to what cells or tissues in animals?
A. totipotent stem cells B. cells in the morula C. the inner cell mass of the blastula D. the germ layers of the gastrula E. None of these choices is correct.
Which of the following enzymes joins DNA strands, joins Okazaki fragments, and mends gaps in the DNA backbone during excision repair?
A. RNA polymerase B. DNA polymerase C. DNA ligase D. DNA gyrase
Some vitamins may be beneficial as antioxidants by protecting cells against free radical damage.
a. true b. false