ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What does the polymerase chain reaction (PCR) do?

1. AIt turns RNA into protein
2. BIt separates proteins by their charge
3. CIt cuts DNA at specific sequences
4. DIt makes many copies of a piece of DNA

Which organelle makes lipids and helps break down drugs and toxins in liver cells?

1. ANucleolus
2. BCentriole
3. CRough endoplasmic reticulum
4. DSmooth endoplasmic reticulum

Which list gives the main taxonomic ranks from broadest to most specific?

1. ADomain, kingdom, phylum, class, order, family, genus, species
2. BSpecies, genus, family, order, class, phylum, kingdom, domain
3. CDomain, phylum, kingdom, order, class, genus, family, species
4. DKingdom, domain, class, phylum, family, order, species, genus

Where does the Krebs (citric acid) cycle take place in a eukaryotic cell?

1. AIn the cytoplasm
2. BOn the rough endoplasmic reticulum
3. CIn the nucleus
4. DIn the mitochondrial matrix

Which process removes carbon dioxide from the atmosphere?

1. APhotosynthesis
2. BCellular respiration
3. CDecomposition
4. DBurning fossil fuels

The human arm, bat wing and whale flipper contain the same set of bones. What does this suggest?

1. AThey evolved completely separately
2. BThey are the result of acquired traits
3. CThey share a common ancestor
4. DThey have the same function

Bacteria from hot springs have enzymes that work best at about 80 °C, while most human enzymes work best near 37 °C. What is the best explanation?

1. ATheir enzymes are made of lipids, not proteins
2. BTheir enzymes have structures that stay stable at high temperatures
3. CTheir enzymes do not have an active site, so heat cannot affect them
4. DHigh temperature never affects any enzyme

A pesticide that is not broken down is sprayed on crops. Later, hawks at the top of the food chain have much higher levels of it than the insects. Why?

1. AThe pesticide is broken down faster in insects than in plants
2. BEach predator eats many prey, so the pesticide builds up at each level
3. CHawks make the pesticide in their own bodies
4. DHawks eat the crops directly, so they take in the most pesticide of all