According to cell theory, which activity is impossible?

A. Skin cells forming from sunlight

B. Liver cells forming from liver cells

C. Prokaryotes existing by themselves

D. Ribosomes being present in eukaryotes

What improves the body's ability to use the calcium in milk

Which statement describes the term "heterozygous"? A) The alleles are the same. B) The alleles are different. C) There is no allele. D) There are two pairs of alleles.

Which division of the ans has a localized effect on the body?

Tamiflu is a common medication given for influenza treatment, its action being to protect and block sialic acid molecules on the surfaces of host cells and influenza virus envelopes as they leave the cell.

Which of the following is NOT an active method where molecules pass across the plasma membrane? A. simple diffusion B. active transport C. endocytosis D. exocytosis

For plant stem length, the dominant allele for height is T and the recessive allele is t. If a heterozygous parent for tall stem length crossed with a homozygous recessive parent for short stem length, what would be the phenotypes of the offspring?

How big is a western toad

Whats the least permeable type of soil?

Most animals reproduce sexually by producing

Eubacteria are classified by BLANK