Робочий аркуш «Біологія для вступних іспитів на медсестринство» з відповідями

What does homozygous mean?

1. AHaving two different alleles for a gene
2. BHaving an extra chromosome
3. CHaving two identical alleles for a gene
4. DHaving only one copy of a gene

Which enzyme adds new nucleotides to build a new DNA strand?

1. ARNA polymerase
2. BHelicase
3. CPepsin
4. DDNA polymerase

Which sex chromosomes does a typical human male have?

1. AXY
2. BYY
3. CXX
4. DX only

Чим насичені жири відрізняються від ненасичених?

1. AВони не мають подвійних зв'язків C=C і зазвичай тверді
2. BВони легко розчиняються у воді
3. CВони містять азот і утворюють білки
4. DВони мають багато подвійних зв'язків і рідкі за кімнатної температури

A thermometer gives readings of 36,1, 36,1 and 36,2 °C for a water bath that is really at 37,0 °C. How are these readings best described?

1. APrecise but not accurate
2. BNeither accurate nor precise
3. CAccurate but not precise
4. DBoth accurate and precise

What does RNA polymerase do?

1. AIt builds an RNA strand from a DNA template
2. BIt builds a protein from an mRNA template
3. CIt removes introns from pre-mRNA
4. DIt copies the whole genome before cell division

A patient is given a large volume of hypotonic IV fluid too quickly. What is the most likely effect on the patient's cells?

1. AWater moves into the cells, and they swell
2. BWater moves out of the cells, and they shrink
3. CNothing changes, because cells are not affected by IV fluid
4. DSalt moves into the cells, and they burst

Two populations of one species live on separate islands for many thousands of years. When brought together, they can no longer interbreed. What has happened?

1. AHomeostasis in both populations
2. BSpeciation after geographic isolation
3. CArtificial selection by humans
4. DHybrid vigour from crossbreeding