Question 24 in dna, the purines always bond to the

a
phosphate group.

B
DNA backbone.

C
sugar.

D
pyrimidines.

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

Which organelle releases chemicals that break down large food particles into smaller ones?

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.