The DNA sequences, indicated by alphabetic abbreviations, are alternate forms of the same gene called

A. chromatids.
B. alleles.
C. chromosomes.
D. centromeres.
E. traits.


B. alleles.

Biology & Microbiology

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Temperature is important for organisms because

A. it affects the rate of biochemical reactions. B. it affects the fluidity and rigidity of plasma membranes. C. high temperatures can damage enzymes. D. it affects metabolic rates and energy expenditure. E. All the choices for this question are correct.

Biology & Microbiology

Structures used in recombinant DNA technology to carry the DNA from the cells of one species to the cells of another species are

A) cloning vectors. B) restriction enzymes. C) sticky ends. D) donor DNA.

Biology & Microbiology

What group is represented by all of the bacteria species E. coli living inside a cow's intestine?

A) community B) population C) ecosystem D) demographic transition

Biology & Microbiology

When population growth rate = rN, this type of growth can be called

A. growth at the carrying capacity. B. exponential growth. C. logistic growth. D. sigmoid growth.

Biology & Microbiology