Crossing-over involves the exchange of genetic information between

a. rna strands.

b. sex chromosomes.

c. non sister chromatids.

d. different genes.

Which is true about fossil fuels? a. Natural gas and oil came from swamp environments, while coal came from open oceans. b. Coal and natural gas came from swamp environments, while oil came from open oceans. c.

How does the genotype of a bacterium determine its phenotype? Use the terms gene, mRNA, ribosome, and polypeptide in your answer.

Water can be returned to the atmosphere by a process know as what?

Which type of nonvascular plant grows in new or disturbed environments? A. mosses B. ferns C. hornworts

The male reproductive cells are produced in the testes. True or False

Coal is used to produce energy. The harmful gases produced by coal are cleaned up by a method which needs a large amount of limestone. Predict and explain the long term effect on the environment of obtaining and using limestone.

True or false two genes may not segregate independently if they are on the same chromosmoe

Blood pressure rises and falls in a pattern corresponding to the phases of the

Immune system cells enter a resting phase after undergoing mitosis. when activated-for example, by an infection-they can reenter the sequence of events in the cell cycle that leads to cell division.

How does a muti-celluar organisms organise