Did dinosaurs exist in the pre-cambrian period?

Which Structures does a cell need for movement? A. mitochondria and Cytoplasm B. cilia and cytoskeleton C. cilia and flagella D. ribosomes and nucleus

T or F: Smoke in the lungs increases the likelihood of infections, as well as chronic diseases. True Fal

In an experiment to determine the effects of radiation on the germination of seeds, a factor that has to be controlled is a. the amount of radiation. b. the types of radiation. c. the germination rate of seeds. d.

Why are c4 plants able to photosynthesize with no apparent photorespiration? they conserve water more efficiently. they exclude oxygen from their tissues. they do not participate in the calvin cycle. they use pep carboxylase to initially fix co2?

If the ductus deferens tubes are cut and tied (vasectomy), the semen will not contain select one: a. fructose. b. buffers. c. mucus. d. sperm. e. all of these.

Assuming that there are only two alleles at a given locus, if the frequency of one allele is 0.6, what is the frequency of the other allele? A. - 0.6. B. 0 C. 0.4 D. 0.6 E. 1

How do cells acquire positional information about their location in a developing embryo?

Which kind of solution is the concentration of solutes the same inside and outside if the cell

Identify the two primary fluids found within the eye. which one of these fluids provides nutrients to the rest of the eye

How are microscopes advantageous to scientist? name two examples when a biologist (or other scientist) may use a microscope?