scince exam 1

Question 1

how do you find the density of a object?

Answer 1

to find the density of an object you divide the mass by the volume

Question 2

what is Dalton’s atomic theory?

Answer 2

1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) All atoms of a given element are identical in mass and properties
3) Compounds are formed by a combination of two or more different kinds of atoms.
4) A chemical reaction is a rearrangement of atoms.

Question 3

what is the first stage of mitosis?

Answer 3

PROPHASE

Question 4

what is aging?

Answer 4

aging is the cell regeneration slowing down

Question 5

A four-stage process that creates two identical cells from one original cell.

Answer 5

mitosis

Question 6

what is the purpose of mitosis?

Answer 6

The purpose of mitosis is to ensure that both new cells have a full set of DNA (genetic material in the form of chromosomes).

Question 7

what is law?

Answer 7

a statement of fact, deduced from observation, to the effect that a particular natural or scientific phenomenon always occurs if certain conditions are present.

Question 8

what is theory?

Answer 8

a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.

Question 9

what is the second stage of mitosis?

Answer 9

METAPHASE

Question 10

what is the last stage of mitosis?

Answer 10

TELOPHASE

Question 11

what is the third stage of mitosis?

Answer 11

ANAPHASE

Question 12

what are SPINDLE FIBRES?

Answer 12

Tiny tubules that
attach themselves to the
chromosomes during mitosis.

Question 13

what is the nucleus?

Answer 13

the nucleus is the control center of the cell. it is inclosed and contains most of the cells dna

Question 14

what happens if cells divided to quickly?

Answer 14

if cells divided t quickly cancer occurs which causes the cells to divide more quickly then before

Question 15

what is grafting?

Answer 15

grafting is where you take a branch from one type of tree and put it on another tree making them one plant

Question 16

what occurs during anaphase?

Answer 16

ANAPHASE — The stage in mitosis
when the duplicated chromosomes
move apart to opposite ends of the
cell.

Question 17

what occurs during telophase?

Answer 17

TELOPHASE — The final stage of
mitosis, during which new nuclei are
formed.

Question 18

what occurs during metaphase?

Answer 18

METAPHASE — The stage in mitosis
when the duplicated chromosomes are
in line across the middle of the cell.

Question 19

what occurs during prophase?

Answer 19

PROPHASE — The first stage in
mitosis, during which the
chromosomes contract and the
nucleolus and nuclear membrane
disappear.

Question 20

what is cell division?

Answer 20

cell division is the process in which one cell becomes two

Question 21

what is a cell plate

Answer 21

The cell wall that develops between two new plant cells.

Question 22

what are chromosomes?

Answer 22

In a nucleus, a double-stranded, threadlike structure

Question 23

what are the advantages and disadvantages of asexual reproduction?

Answer 23

Advantages: rapid reproduction, no matter needed, no mate needed, no time or energy investment needed.

Disadvantages: no diversity, prone to extinction (all have the same weaknesses), cannot adapt to environmental conditions

Question 24

What is cloning?

Answer 24

A process in which identical offspring are produced from a single cell or tissue