Why are transposons considered selfish genetic elements?
What will be an ideal response?
ANS:
Transposons usually do not perform useful functions in the host genome. Their genetic structure is used to mediate their own replication.
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Hypotheses must be ________.
A. testable B. repeatable C. falsifiable D. All of the above are important characteristics of hypotheses.
Diphtheria exotoxin is made only by strains of Corynebacterium diphtheriae that carry a prophage containing the tox gene.
Answer the following statement true (T) or false (F)
Which of the following is not true about monozygotic twins?
A) They share all alleles at all loci. B) They have a genetic relatedness of 0.5. C) They have a genetic relatedness of 1.0. D) They come from the joining of a single egg with a single sperm cell. E) They are the result of a split of the zygote after fertilization.
Plastids are storage organelles. A chloroplast is a type of plastid. What does a chloroplast store?
A) Energy B) Chlorophyll C) Carbon D) Electrons