Which of the following does not describe the structure of DNA?

double helix

o nucleotide polymer

contains adenine guanine pairs

sugar-phosphate backbone

The thymus gland produces a special type of leukocyte called

Which organelle appears to be empty but is filled with liquid? Chloroplast Cell membrane Vacuole Ribosome

Does infertility and impotence mean the same thing

How do both asexual and sexual reproduction allow for the survival of a species?

Why is carbon present in so many types of molecule

What does blood deliver to every part of the body?

Which of the hormones below is responsible for facultative water reabsorption? Question options: aldosterone ADH atrial natriuretic peptide thyroxine

An unknown species is discovered to have diploid cells that contain 130 chromosomes. How many chromosomes would be found in the gametes of this species were it to reproduce?

What do most experiments test? 1:Scientific theories 2:Falsifiability of hypotheses 3:Accuracy of information 4:Predictions based on hypotheses

How do substances change after chemical reaction? A. they change phase B. their atoms are rearranged C. their atoms lose electrons D. they lose mass