Skin color in a fish is inherited via a single gene with four different alleles. How many different types of gametes would be possible in this system?
A) 1
B) 2
C) 4
D) 8
E) 16
Ans: C) 4
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The myriapods include the _____, which are fast-moving predators with front legs modified into venomous fang-like organs, and _____, which are slow-moving herbivores
A. centipedes; millipedes B. millipedes; centipedes C. spiders; mites D. scorpions; millipedes E. centipedes; mites
The result of __________ is the division of a cell’s chromosomes into two new nuclei, each of which has the same amount and type of DNA as the original nucleus. The division of the cells cytoplasm is called __________and occurs with the production of two new cells.
A. cytokinesis; mitosis B. interphase; mitosis C. mitosis; cytokinesis D. mitosis; interphase
Through initial observation, research led by Naud and Hanlon showed that the main adaptation in behavior, that increases reproductive success of a male in the cuttlefish Sepia apama, is
A. None of the answer choices is correct. B. to change color and mimic another female, because the females are solitary and do not allow any males near them. C. an altruistic trade, in which females allow a large male to mate with them in exchange for protection from predators during the vulnerable gestation period. D. guarding the females from subsequent mating attempts by other males. E. the use of the male's arms to sort and mix the eggs and sperm, to ensure successful fertilization before he leaves the female.
Sigma (?) factors can regulate the initiation of transcription. Which of the following is not an example of ? regulation?
A) Some ? factors recognize promoters for genes whose products are necessary when the organism is under stress, such as heat shock. B) Some ? factors recognize promoters for genes whose products are necessary for nitrogen utilization. C) Bacteriophages may code for specific ? factors that bind the core RNA polymerase and result in recognition of viral promoters. D) Many ? factors regulate genes associated with embryonic development in eukaryotes. E) UV irradiation can trigger the use of alternative ? factors.