Cells and Viruses Biology

What is the difference between DNA and RNA in terms of bases?

• RNA contains uracil in place of thymine

• RNA contains uracil in place of adenine

• RNA contains uracil in place of guanine

• RNA contains uracil in place of  cytosine

A student observes a dark X-shaped structures in some onion root cells. Based on the observation, which process are these cells most likely performing?

• Meiosis

• Membrane Transport

• Mitosis

• Squirrel

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This type of fermentation occurs in the presence of oxygen....

• aerobic respiration

• anaerobic respiration 

• fermentation

• lactic acid fermentation

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___________ is the genetic material found in cells that contain the code of life, usually called DNA.

• A trait

• A mutation

• A chromosome

• Deoxyribonucleic acid

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 A _________ is a scientist who studies viruses.

• virologist

• biologist

• botanist

• chemist

________ are changes in genetic material. 

• Genes

• Mutations

• Variations

• Biology

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_________ are strands of DNA that have been tightly coiled. 

• Genes

• Traits

• Chromosomes

• DNA

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Humans have ____ chromosomes.

• 57

• 22

• 46

• 100

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Complex organisms require a large number of cells that

• are specialized and work together.

• resist being attacked by viruses and bacteria.

• will keep the organism warm.

• can retain more water than a small number of cells.

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Miranda learned how the human body carries out life functions. Which is the most basic level of organization in the human body?

• an organ

• a system

• a tissue

• a cell

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