What enzyme works to add DNA to ends of chromosomes in rapidly dividing cells such as those found in an embryo, to prevent genes from being lost during replication?

a. DNA polymerase

b. histones

c. telomerase

d. chromatin

Which order of events is correct. a. zygote - > stem cells - > cell differentiation b. mitosis - > cell differentiation - > stem cells c. stem cells - > zygote - > cell differentiation d. zygote - > cell differentiation - > mitosis

What distinguishes a hypothesis from a theory? A. A theory is a scientific explanation. B. A theory is testable. C. A theory explains a natural phenomenon. D. A theory is backed up by repeated observations and tests.

Compare the direction of movement in a reverse fault and in a strike-slip fault.

When will natural selection occur apex?

What controls traits and inheritance

Cómo clasificarías la Adenina

Why did sumerians need to trade

Which is a sustainable practice? wind farms clear cutting flood irrigation overfishing

What happens in each phase of miosis.

Purple petal color in pea plants is dominant to white petal color. Two heterozygous pea plants are crossed. What ratio of the offspring will have white petals? Express this in a percentage.