Answer the following question given this paragraph:      Q: Plant cells divide into two equal halves during what process?   Choices:  - death  - prokaryotes  - cytokinesis  - mitosis  A:
mitosis

Answer the following question given this paragraph:   To begin mitosis, the DNA in the nucleus wraps around proteins to form chromosomes . Each organism has a unique number of chromosomes. In human cells, our DNA is divided up into 23 pairs of chromosomes. Replicated DNA forms a chromosome made from two identical sister chromatids , forming an "X" shaped molecule ( Figure below ). The two chromatids are held together on the chromosome by the centromere . The centromere is also where spindle fiber microtubules attach during mitosis. The spindles separate sister chromatids from each other.   Q: What forms when the dna in the nucleus wraps around proteins?   Choices:  - rna  - genes  - ribosomes  - chromosomes  A:
chromosomes

Answer the following question given this paragraph:   Courtship behaviors occur in many other species. For example, males in some species of whales have special mating songs to attract females as mates. Frogs croak for the same reason. Male deer clash antlers to court females. Male jumping spiders jump from side to side to attract mates.   Q: What type of behavior is frogs croaking or deer clashing antlers an example of?   Choices:  - instincts  - learned behavior  - mating  - courtship  A:
courtship

Answer the following question given this paragraph:   Each muscle fiber contains hundreds of organelles called myofibrils . Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is called a sarcomere . Within a sarcomere, myosin filaments overlap the actin filaments. The myosin filaments have tiny structures called cross bridges that can attach to actin filaments.   Q: Hundreds of organelles called myofibrils, made up of two types of protein filaments, are contained in each fiber of what?   Choices:  - bone  - hair  - cartilage  - muscle  A:
