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Question 1

What are the three components of the Cell Theory?

Answer 1

all living things are composed of one or more cells the cell is the basic unit of life new cells arise from existing cells.

Question 2

What is the difference in pyrymidine and purine in nucleotides? Which nitrogen base is in which?

Answer 2

The two-carbon nitrogen ring bases (adenine and guanine) are purines while the one-carbon nitrogen ring bases (thymine and cytosine) are pyrimidines.

Question 3

define a homologous chromosome

Answer 3

a maternal chromosome with its corresponding paternal chromosome

Question 4

what happens to chromosmes during interphase?

Answer 4

chromosomes are duplicated, so there are two identical copies of sister chromotids

Question 5

what happens during prophase 1 of meiosis? four points

Answer 5

spindle forms and duplicated chormosmes move to poles

chromosomes condense in the nucelus

homologous pairs stick together, crossing over occurs (crossing of maternal and paternal genetic material)

nuclear envolope breaks down

Question 6

what happens in metaphase 1? 1 point

Answer 6

chromosome pairs in the metaphase plate

Question 7

what happens in anaphase 1?

Answer 7

homologous chormosomes split and chromosomes move to seperate ends of the pole by mitotic spindles

Question 8

what happens in telophase and cytokenisis 1 of meiosis? 1 point

Answer 8

there are 23 duaghter cells in each cell (when it started with 46)

Question 9

what is different about meiosis 1 and meiosis 2?

Answer 9

crossing over dosent occur

chromosomes become choromotids

four haploid cells at the end of it