What step in DNA replication precedes the pairing of complementary bases?

a. polymerization of DNA.

b. separation of the two strands.

c. formation of the histone core.

d. joining of the two strands.

e. mitotic division.

Which of the following are examples of the effects of living things on the atmosphere and climate? outgassing of volcanoes the buildup of oxygen in the atmosphere mass extinctions changes in levels of carbon dioxide

give two ways that humans are organized to carry out their life functions and explain how each is vital to the survival of humans

What do you know an organisms parents if it is heterozygous for a certain trait? A. both parents supplied B. The parents had the same traits. C. The parents supplied different alleles. D. The parents had different traits.

In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange color. The heterozygote is tortoiseshell.

In the ocean winds determine?

An experiment was conducted to determine which type of fruit attracts the most fruit flies. Equal sized pieces of apple, pear, and banana were placed in separate containers at different areas around the school.

In the F2 generation of Mendel's crosses, A. all plants had the dominant trait. B. half of the plants had the dominant alleleC. all plants had both the dominant and recessive alleles. D. one in four plants had two alleles for the recessive trait.

In a population, when the birthrate becomes higher than the death rate, the population's growth rate A) decreases. B) increases. C) slows to a stop. Eliminate D) levels off and remains constant.

Types of calcareous marine microorganisms

Which of the following are examples of the first specialized tissues? A. antennae B. eyes C. kidneys D. tentacles