Distinguish between diurnal, nocturnal, and crepuscular animals, and give an example of each. What will be an ideal response?
Diurnal animals (e.g., honeybees and pigeons) are most active during the day.
Nocturnal animals (e.g., bats, moths, and cats) are most active at night.
Crepuscular animals (e.g., mosquitoes and fiddler crabs) are most active at dawn, dusk, or both.
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Which of the following described roles attributed to accessory pigments such as carotenes and phycobiliproteins? (Check all that apply.)
A. These pigments extend the spectrum of wavelengths that will drive photosynthesis. B. Accessory pigments protect organisms from potentially damaging intense sunlight. C. The accessory pigments are involved in maintaining the Calvin cycle. D. These pigments absorb light in ranges not absorbed by chlorophylls and transfer the energy to chlorophylls.
In the semi-conservative model of replication, what percent of the parental DNA (generation 0) remains in generation 4?
a. 25% b. 50% c. 100% d. 12.5%
In the technique of artificial twinning,
a. two embryos are fused. b. an embryo is teased apart. c. two sperm are used to fertilize a single egg. d. two eggs and two sperm are used to form two embryos. e. an embryo’s nucleus is removed and replaced with an adult embryo
Cilia and flagella ____
a. are found only in cells that are actively moving b. are found only in sex cells and unicellular organisms c. use motor proteins to induce movement d. may also function as receptor sites for certain hormones e. are found only in unicellular organisms