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Questions in Biology ..?

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hello ..

I need the right answers for this questions
its necessary to the exam tommorow
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1l cell membranes consist mainly of a
a. carbohydrate bilayer and proteins
b.protein pilayer and phospholipids
c.lipid pilayer and proteins

2lmost membrane functions are carried out by
a.proteins
b.phospholipids
c.nucleic acids
d.hormones

3lImmerse a living cell in a hypotonic colution, and water tend to
a.move into the cell
b.move out of the cell
c.show no net movement
d.move in by endocytosis

4l ........ can readly diffuse across a lipid pilayer
a. glucose
b.oxygen
c. carbon dioxide
c.b and c

5l sodium ions cross a membrane hrough transport proteins that receive an energy boost. this is an example of
a.passive transport
b. active transport
c.faciliated diffusion
d.a and c

6l vesicle formation occurs in
a.membrane cycling
b.phagocytosis
c.endocytosis and exocytosis
d. all of the above

7l a duplicated chromosome has ......chromatid>s
a. one
b.two
c.three
d.four

8l in a chromosome, a ...... is a constricted region with attachment sites for microtubules.
a.chromatid
b.cell plate
c. centromere
d. abnormal

9l a somatic cell having two of each type of chromosome has a (n...... chromosome number
a.diploid
b.haploid
c.tetraploid
d.abnormal

10l Interphase is the part of the cell cycle when
a. a cell ceases to function
b. a germ cell forms its spindle apparatus
c. a cell grows and duplicates its DNA
d. mitosis proceeds

11l After mitosis , the chromosome number of a daughter cell is .... the parent cell's
a. the same as
b.one- half
c. rearranged compared to
d. doubled compared to

12l match each stage with the events lsted.
metaphase ( )
prophase ( )
telopase( )
anaphase ( )
a. sister chromatids move apart
b.chromosomes start to condense
c. chromosomes decondense and daughter nuclei form
d. all duplicated chromosomes are aligned at the spindle equator

13l an animal cell having two rather than one of each type of chromosome has a ..... chromosome number
a. diploid
b.haploid
c. normal gamete
c. both b and c

14l Generally, a pair of homologous chromosomes
a. carries the same genes
b. has the same length , shape
c. interacts at meiosis
d. all of the above

15l meiosis .... the parental chromosome number
a. doubles
b. reduces
c. maintains
d. corrupts

16l Before the onest of meiosis, all chromosomes are
a.condensed
b.released from protein
c.duplicated
d. both b and c

17l match each term with its description

chromosome number( )
alleles ( )
metaphase ( )
interphase ( )

a. different molecular forms of the same gene
b. none between meiosis 1 and 2
c. pairs of homologous chromosomes are now aligned at the spindle equator
d. sum total of chromosomes in all cells of a given type

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