Sepia apama cuttlefish mollusk males and females
A. live in populations of equal proportions, producing equal probability of reproductive success.
B. can't mate successfully unless they are among the larger individuals in the population.
C. are opportunistically hermaphroditic, able to mate as either male or female depending on the population needs.
D. are sexually dimorphic, having different arm lengths and colorations.
E. mate during the warm spring season.
D. are sexually dimorphic, having different arm lengths and colorations.
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A pure culture
A) is sterile. B) is a population of identical cells. C) is made of a clearly defined chemical medium. D) contains one microbial cell.
Which of the following is closest to a micrometer in size?
A) the width of a strand of DNA B) the length of a plant cell C) the length of a chicken egg D) a typical bacterial cell E) the size of a ribosome
Which action is unable to produce variation?
a. crossing over b. random alignment of chromosomes during meiosis c. asexual reproduction d. genetic recombination of alleles e. sexual reproduction
Which of the following features is characteristic of all
life? a. organization of molecules into cells b. metabolic control using enzymes c. a continuous flow of sustaining energy d. DNA with its hereditary code e. all of these