A student is examining leaf cells. Which organelles are most likely to be missing from the cells? A. ribosomes
B. chloroplasts
C. lysosomes
D. mitochondria

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.