Cevaplı Hemşirelik giriş sınavları için biyoloji çalışma kâğıdı

Baskın bir alel için hangisi doğrudur?

1. AEtkisini yalnızca iki kopya varken gösterir
2. BHer zaman anneden kalıtılır
3. CFenotipte hiçbir zaman görünmez
4. DYalnızca tek kopyası varken etkisini gösterir

What is an allele?

1. AA different version of the same gene
2. BA pair of matching chromosomes from each parent
3. CA section of DNA between genes
4. DA protein made from a gene

What is cytokinesis?

1. AThe condensing of chromosomes in prophase
2. BThe copying of DNA before division
3. CThe division of the cytoplasm into two cells
4. DThe pairing of homologous chromosomes

A woman with blood type O has a child with a man of type AB. Which blood types can their children have?

1. AA or B
2. BO only
3. CA, B, AB or O
4. DO or AB

The sodium-potassium pump moves ions across the cell membrane. What does one cycle of the pump do?

1. AMoves Na⁺ in and K⁺ out, without using ATP
2. BMoves 3 K⁺ out and 2 Na⁺ in, using ATP
3. CMoves 2 Na⁺ out and 3 K⁺ in, using ATP
4. DMoves 3 Na⁺ out and 2 K⁺ in, using ATP

There are 64 possible codons but only about 20 amino acids. What does this tell you about the genetic code?

1. AEach amino acid has exactly three codons
2. BOnly 20 of the codons are ever used
3. CEach codon codes for more than one amino acid at the same time
4. DMost amino acids are coded for by more than one codon

Two parents are both carriers of cystic fibrosis, an autosomal recessive disorder. They have three children. What is the probability that none of the three is affected?

1. A9/16
2. B3/4
3. C1/64
4. D27/64

Why are there usually far fewer top predators than herbivores in an ecosystem?

1. ATop predators reproduce faster than herbivores, so they die sooner
2. BEnergy is lost at each step, leaving little for the top level
3. CTop predators need less energy than herbivores
4. DHerbivores eat the young of top predators