A chemical reaction or physical change that absorbs heat.

An air bag filled with 77.8 g of nitrogen gas at 25°C has a volume of 66.8 L. What is the pressure in the bag in kPa?

In the text box below, answer the following about the cell below:   a. Is this cell in the process of mitosis or meiosis (1pt)? b. What phase of the process is the cell in (1pt)? c. Consider one of the dark blue figures in the cell. Does this represent a chromatid or a chromosome, and is the figure unreplicated or replicated (1pt)? d. What is the genetic content of the cell (n and ploidy, you may write as shorthand, 1pt)? e. At the end of the process, how many chromosomes will there be in each daughter cell (briefly explain your answer, 1pt)?            

A true-breeding tall, purple-flowered pea plant was crossed to a true-breeding short, white-flowered pea plant. The F1 generation consisted of all tall, purple-flowered plants. Using this information, answer the following in the text box below: Are there one or two characters being studied in this cross (list the character(s) and the traits associated, 1pt)? Assign letters for the alleles carried by the parental generation plants (be sure to indicate dominant and recessive and the phenotype associated with each letter, 1pt). Using the letters you assigned, give the genotypes of the parents and of the F1 generation. Then, give the gametes that will be formed from the F1 generation (1 pt). Explain: how are Mendel’s two laws demonstrated by this cross (2pts)?

The genetic content of a cell is 3n = 21. What is n equal to?

Continuing from the last question (pedigree is the same): The question mark on the pedigree below indicates a third child the couple is expecting. Calculate the probability that the child will be a girl and have the condition (hint: use the scratch paper and write out the likely genotypes of the parents to help).

Prokaryotes divide by __________________, which is a type of ______________ reproduction.

Colorblindness is an X-linked recessive trait in humans. Consider a mother who is a carrier of this trait and a normal father.  Which of the following combinations shows the correct genotype for the mother and father in this scenario? A.  XAXa, XaY   B. XAXa, XAY   C. XAXA, XaY   D. XAXA, XAY  

A true-breeding tall, purple-flowered pea plant was crossed to a true-breeding short, white-flowered pea plant. The F1 generation consisted of all tall, purple-flowered plants. Using this information, answer the following in the text box below: Are there one or two characters being studied in this cross (list the character(s) and the traits associated, 1pt)? Assign letters for the alleles carried by the parental generation plants (be sure to indicate dominant and recessive and the phenotype associated with each letter, 1pt). Using the letters you assigned, give the genotypes of the parents and of the F1 generation. Then, give the gametes that will be formed from the F1 generation (1 pt). Explain: how are Mendel’s two laws demonstrated by this cross (2pts)?

Which of the following life cycles is common in plants and features multicellular stages that alternate between haploid and diploid?