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Grade 7 Science summative exam (Tri 2)
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Question 15 Analyze: Level 7-8 A pharmacist discovered a medicine for a certain bacteria that reproduces asexually, he tested this medicine and found it to be
…yes , since bacteria reproduce by asexual reproduction so all generations will be identical , same medicine will work for all bacteria
Question 14 Interpret: Level 5-6 Is it possible for a woman to experience a delay
……………yes –if she is pregnant, Stress, low level of estrogen
Question 13 Apply: Level 3-4 By observing the 3 phases of the menstrual cycle, in which phases will it be impossible for this woman to get pregnant.
infertile and menstruation
Question 12 Apply: Level 1-2 Why does the menstruation occur after the infertile phase?
to remove the broken endometrium and unfertilized eggs out of the body
The rate of cell division varies greatly in different types of human cells, the data table b- If you were asked to add one more cell that divides by meiosis to this data table. below shows the replacement rates of many types of human cells.
reproductive cell (ovary/testes)/sperm and egg
The rate of cell division varies greatly in different types of human cells, the data table below shows the replacement rates of many types of human cells.a- Which cell type has the shortest cell cycle?
lining of small intestine
If you were given the number of the following nitrogenous bases in a DNA molecule (Adenine, thymine and Guanine), suggest how to find the number of cytosine bases in the same molecule.
same as guanine
a. Solve: Some students were observing a diagram demonstrating the 2 types of cell division. How many cells are produced by the meiotic cell division (meiosis)?
……………4 cells
How Many pairs of autosomes are there in this karyotype?
22 pairs of chromosomes
A biologist was examining the somatic cells of a newly discovered species of insects, he found 68 chromosomes in these cells, how many chromosomes will be found in the egg cells of this newly discovered species.
34 chromosomes ………………………………..
b- By observing the human karyotype, suggest how to determine the gender (Male or female).
look at sex chromosomes xx =female Xy=male
a- If you were observing different cells during their cell cycle suggest how to differentiate between the interphase and the prophase.
chromatin =interphase, condensed chromosomes =prophase 2) nucleus present =interphase, nucleus disappears =prophase 3) spindle fiber not present =interphase, s
a- A scientist was examining the offspring of an organism, suggest how to determine the type of reproduction by which these offspring were produced.
identical > asexual Non-identical >sexual


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