Which mechanism of genetic variation results from the exchange of gene segments between non sister chromatids

Diffusion is a passive process that accounts for the movement of respiratory gases across the capillary membranes of alveoli. True False

You isolate a molecule from an alien creature. It is double stranded and has new unknown nitrogenous bases. It has B-D and R-Q base pairs. Is this molecule more likely to be DNA or RNA? Explain your answer.

A marine biologist observed an organism. It had openings on its body through which food particles and water passed. Which phylum does the organism belong to? Cnidaria Porifera Platyhelminthes

1. The sporophyte generation produces spores that grow into a (n) gametophyte. gymnosperm. angiosperm. pupa.

Stem cell research has been a controversial subject in past years. What is the reason for this? a: Cells for study are often taken from human embryos. b: Stem cell techniques will not accomplish the intended purpose.

An educate guess about the meaning of the term "chlorophyll"

All BUT one of the phrases describe a function of the human skeletal system. That is A) allows for movement. B) protects internal organs. C) produces red blood cells. D) filters unwanted substances.

Why is it important for cell division to occur?

Which of the following is true about the hierarchy or organization of life? (Check all that apply) A. Changes at the lowest level can affect the more complex levels. B. Cells make up tissues. C. Cells are made up of macromolecules. D.

Unwrapped food placed in a freezer experiences dehydra - tion, known as "freezer burn." why?