Question

5)Sunflowers are both ________.

a)heterotrophs and producers

b)autotrophs and producers

c)producers and decomposers

d)heterotrophs and consumers

6)A karyotype (a display of the chromosomes in a cell) is often used to look for genetic disorders. Karyotype results would NOT be useful to determine ________.

a)Down syndrome

b)sex

c)Turner syndrome

d)eye color

7)During Prophase I, ________.

a)sister chromatids migrate to opposite poles

b)crossing over occurs

c)homologous chromosomes line up in the middle of the cell

d)the nuclear envelope breaks up

8)Which molecule is produced during the light reactions of photosynthesis?

a)C6H12O6

b)ADP

c)CO2

d)O2

9)Plant cells ________.

a)use carbon dioxide but do not use oxygen

b)do not need mitochondria because their chloroplasts meet their energy needs

c)have chloroplasts and mitochondria

d)do not need chloroplasts because their mitochondria meet their energy needs

10)Eukaryotic cells have their chromosomes packaged in the

a)a measure of calories

b)a measure of calories

c)the capacity to cause movement

d)a measure of disorder

11)Which environments would be best for the functioning of animal and plant cells?

a)A hypotonic environment for plant cells and an isotonic environment for animal cells

b)An isotonic environment for both plant and animal cells.

c)A hypotonic environment for animal cells and an isotonic environment for plant cells

12)How many chromosomes does an individual with Klinefelter Syndrome have?

a)45

b)24

c)46

d)47

Answer 1

1) sunflowers are plants, plants produce food by their own using the energy of sunlight via photosynthesis, so sunflowers are photoautotrophs and producers so the answer is b)autotrophs and producers.

2) Karyotype helps to identify the number of chromosomes in the cells, down syndrome is due to the trisomy of chromosome 21, Turners syndrome is due the presence of only one X chromosome, sex can be determined by checking the presence of the sex chromosome, eye colour depends on the genes on the chromosome which cannot be determined by using the karyotype so the answer is d) eye colour.

3) during prophase I, the nuclear envelope disintegrates, the homologous chromosomes pair up and crossing over occurs between the non-sister chromatids of the chromosomes, during metaphase the paired chromosomes align at the metaphase plate, so the answers are b)crossing over occurs, d)the nuclear envelope breaks up

4) light reactions uses the energy of sunlight to excite electrons, during the electron transport H+ is pumped into the thylakoid lumen,so an H+ gradient is generated, and the electron finally reaches NADP+ and reduces it to NADPH, the energy stored in the H+ gradient is used to make ATP from ADP and Pi, the electron lost from the Photosystem is replaced with electrons from the water, water is split to oxygen, electrons, and H+,so the answer is d) O2