In angiosperms, double fertilization produces a trinucleate cell that gives rise to a ____ endosperm and a ____
embryo.
a. haploid; triploid
b. triploid; haploid
c. triploid; diploid
d. diploid; triploid
e. diploid; haploid
ANSWER: c
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Modification enzymes typically methylate specific bases within the recognition sequence to prevent digestion of the nucleotide sequence by restriction endonucleases
Indicate whether the statement is true or false.
Which of the following statements best describes the life cycles of charophyceans and mosses?
A. The diploid generation of charophyceans consists of only one cell whereas the diploid generation of mosses is multicellular. B. The haploid generation of charophyceans consists of only one cell whereas the haploid generation of mosses is multicellular. C. The haploid and diploid generations of charophyceans both consist of only one cell whereas both generations of mosses are multicellular. D. The haploid and diploid generations of both charophyceans and mosses are unicellular. E. All of the choices provided are incorrect.
The analysis of energy flow in an aquatic ecosystem in Silver Springs, Florida revealed that ____
a. energy flows are difficult to measure b. most of the sun's energy is harvested c. only a little energy is transferred from one trophic level to the next d. the energy flow in carnivores is equal to that of producers e. trophic energy losses are not significant
As the sun is setting, you notice bats coming out of a cave. In the very early morning several days later
you notice them entering the cave. Which circadian rhythm would best explain this observation? a. crepuscular b. nocturnal c. diurnal d. lunar e. asynchronous