Which nucleotide is only found in RNA?

a. adenine
b. thymine
c. adenine
d. guanine
e. uracil


e

Biology & Microbiology

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The persistence of the sickle-cell anemia allele in some African populations is the result of ____

a. a high rate of mutation of the normal allele to the sickle-cell anemia allele b. the advantage of the heterozygous form over the homozygous forms c. nonrandom mating d. a decline in the occurrence of malaria in Africa e. genetic drift

Biology & Microbiology

Matching. Choose the one most appropriate answer

for each. 1. ___ aggregate fruit 2. ___ anther 3. ___ carpel 4. ___ embryo sac 5. ___ endosperm mother cell 6. ___ megaspores 7. ___ micropyle 8. ___ microspores 9. ___ multiple fruit 10. ___ ovary 11. ___ ovule 12. ___ petal 13. ___ pollen grain 14. ___ sepal 15. ___ stigma A. male spores of anthers B. site where pollen tube usually penetrates the ovule C. develops into a fruit at maturity D. a 2n cell that will help form nutrients for the developing plant embryo E. cluster of matured ovaries attached to a common receptacle F. modified leaf with pigments and fragrance-producing cells G. immature male gametophyte H. female reproductive organ I. landing platform for pollen J. pollen-bearing structure K. female spores of ovule L. outermost whorl of leaf parts on a receptacle; generally green, but sometimes pigmented M. female gametophyte N. matured ovaries of several flowers fused together into a single mass (for example, pineapple, fig) O. forms a seed at maturity

Biology & Microbiology

For speciation to occur there must be

A) sexual reproduction. B) genetic variation. C) isolation. D) natural selection.

Biology & Microbiology

Why are most autotrophs referred to as the producers of the biosphere?

What will be an ideal response?

Biology & Microbiology