A 75 year old man need a replacement heart valve. he lives alone and cares for himself. is a mechanical or biological heart more suited for him

Genes that are found along a DNA molecule hold instructions to build (blank).

In order for a cell to become cancerous, oncogenes must be ___ and tumor suppressors ___.

A scientist observes a bacterial specimen obtained from mud in a swamp. The bacteria are producing hydrogen sulfide (H2S) which creates a foul smell.

Which vascular tissue is involved in the transportation of starch found in fruit pulp? a. Xylem b. Phloem c. Pith

What unusual property do cytochromes have in common with hemoglobin or myoglobin?

A human activity that could significantly decrease the amount of carbon dioxide in the air is (1) increasing the use of fossil fuel (2) controlling insect pests that eat stored grain (3) burning garbage and trash to generate electricity (4)

What are somatic cells

What type of bacteria causes environmental change

Contrast a food chain with a food web, and include the total % of energy which is conserved between each level of a food chain

What happens when the lungs recoil? A. Inspiration occurs. B. Internal respiration occurs. C. Ribs and diaphragm muscles contract. D. Expiration occurs.