Some organisms are capable of asexual or sexual reproduction. Under favorable conditions, reproduction proceeds asexually. When conditions become more stressful, reproduction switches to a sexual mode. Why?
A) Sexual reproduction produces individuals with new combinations of recombined chromosomes increasing diversity.
B) Sexual reproduction is simple and more rapid, allowing larger numbers of offspring to be produced.
C) Asexual reproduction requires more energy.
D) Sexual reproduction requires two separate individuals who can mutually provide nutrient support during stress.
A
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How many DNA triplets encode 60 amino acids?
A. 180 B. 30 C. 20 D. 60
Species whose ancestors might once have been free living may now be present as parasites. Would their genomes now tend to be larger, smaller, or approximately the same in size and complexity?
What will be an ideal response?
How can the preservation of biological diversity be justified?Check all that apply.
A. supernatural responsibility B. economic value C. exploitative value D. ethical grounds E. ecological value
The monomers that make up proteins are ________.
a) disaccharides b) amino acids c) chaperones d) nucleotides