NEED HELP ON EXAM
Which element is necessary to form a protein molecule but not a carbohydrate
molecule?
Question 3 options:

A. carbon

b. nitrogen

c. oxygen

d. hydrogen

How are prokaryotic and eukaryotic cells similar?
Question 7 options:

A. Both contain cell walls.

B. Both contain a nucleus

C. Both contain ribosomes

D. Both contain membrane-bound organelles.

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer