What enables the copied chromosomes to separate during binary fission?
a. The nuclear membrane dissolves.
b. The mitotic spindle drives the separation.
c. The septum splits the replicated chromosomes.
d. The chromosomes are attached to different parts of cell membrane, which elongates and thus separates the chromosomes.
Answer: d. The chromosomes are attached to different parts of cell membrane, which elongates and thus separates the chromosomes.
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Sister chromatids are best described as two DNA molecules that have ______________
A. the same genes in the same order but that have different alleles. B. the same alleles of the same genes in a different order. C. different genes in the same order and possibly have different alleles of some genes. D. different alleles of the same genes arranged in a different order. E. virtually identical sequences of nucleotides.
Measuring its costs and benefits in terms of energy spent and/or gained, which interaction(s) involve at least one individual gaining? Select all that apply
A. competition B. predation C. obligate mutalism D. facultative mutalism E. commensalism
Why do the photosynthetic tissues of plants look green?
What will be an ideal response?
In the transport model shown below, what is the exchange rate of Na+ for K+?
a. They are traded evenly across the membrane.
b. Two Na+ are exchanged for every single K+.
c. Three Na+ are exchanged for each two K+.
d. This model is not transporting the ions at all.